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Xerox Phaser 7750 Service Manual

Manual is about: Service Manual

Summary of Phaser 7750

  • Page 1

    Service manual p h a s e r ® c o l o r l a s e r p r i n t e r 7750

  • Page 3: Service Manual

    Phaser 7750 color laser printer service manual warning the following servicing instructions are for use by qualified service personnel only. To avoid personal injury, do not perform any servicing other than that contained in the operating instructions, unless you are qualified to do so. First printi...

  • Page 4

    Copyright © 2004, xerox corporation. All rights reserved. Unpublished rights reserved under the copyright laws of the united states. Contents of this publication may not be reproduced in any form without permission of xerox corporation. Copyright protection claimed includes all forms of matters of c...

  • Page 5: Service Terms

    Service manual iii service terms manual terms various terms are used throughout this manual to either provide additional information on a specific topic or to warn of possible danger present during a procedure or action. Be aware of all symbols and terms when they are used, and always read note, cau...

  • Page 6

    Iv phaser 7750 color laser printer symbols marked on the product danger high voltage. Protective ground (earth) symbol. Hot surface on or in the printer. Use caution to avoid personal injury. The surface is hot while the printer is running. After turning off the power, wait 30 minutes. Avoid pinchin...

  • Page 7: Power Safety Precautions

    Service manual v power safety precautions power source for 110 vac printers, do not apply more than 140 volts rms between the supply conductors or between either supply conductor and ground. Use only the specified power cord and connector. For 220 vac printers, do not apply more than 264 volts rms b...

  • Page 8

    Vi phaser 7750 color laser printer electrostatic discharge (esd) precautions some semiconductor components, and the respective sub-assemblies that contain them, are vulnerable to damage by electrostatic discharge (esd). These components include integrated circuits (ics), large-scale integrated circu...

  • Page 9: Service Safety Summary

    Service manual vii service safety summary general guidelines for qualified service personnel only: refer also to the preceding power safety precautions. Avoid servicing alone: do not perform internal service or adjustment of this product unless another person capable of rendering first aid or resusc...

  • Page 10: Servicing Fuser Components

    Viii phaser 7750 color laser printer servicing electrical components before starting any service procedure, switch off the printer power and unplug the power cord from the wall outlet. If you must service the printer with power applied, be aware of the potential for electrical shock. Warning turning...

  • Page 11: Regulatory Specifications

    Service manual ix regulatory specifications united states the equipment described in this manual generates and uses radio frequency energy. If it is not installed properly in strict accordance with xerox’ instructions, it may cause interference with radio and television reception or may not function...

  • Page 12: European Union

    X phaser 7750 color laser printer european union xerox corporation declares, under our sole responsibility, that the printer to which this declaration relates is in conformity with the following standards and other normative documents: following the provisions of the low voltage directive 73/23/eec ...

  • Page 13

    Service manual xi this product, if used properly in accordance with the user’s instructions, is neither dangerous for the consumer nor for the environment. A signed copy of the declaration of conformity for this product can be obtained from xerox. Line voltage drop-out iec 61000-4- 11:1994 >95% drop...

  • Page 14

    Xii phaser 7750 color laser printer.

  • Page 15: 1 General Information

    Service manual xiii contents service terms . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .Iii symbols marked on the product . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .Iv power safety precautions . . . . . . . . . . . . . . . . . . ....

  • Page 16: 3 Error Messages and Codes

    Xiv phaser 7750 printer #4 skew (rough) setup. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-19 view the regicon patterns. . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-20 sensors . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . ...

  • Page 17: 4 General Troubleshooting

    Service manual xv engine logic board nvram failure, code 83 . . . . . . . . . . . . . . 3-40 controller to engine logic board time failure, code 84 . . . . . . 3-40 engine logic board micro pitch failure, code 85. . . . . . . . . . . . 3-40 high-voltage power supply failure, code 86 . . . . . . . . ...

  • Page 18: 7 Cleaning and Maintenance

    Xvi phaser 7750 printer windows 98 and windows me troubleshooting . . . . . . . . . . . . 4-25 macintosh troubleshooting . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-27 novell netware troubleshooting . . . . . . . . . . . . . . . . . . . . . . . . 4-28 5 print-quality troubleshooting prin...

  • Page 19: 8 Service Parts Disassembly

    Service manual xvii 8 service parts disassembly overview . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8-2 standard orientation of the printer for disassembly . . . . . . . . . . 8-2 general notes on disassembly . . . . . . . . . . . . . . . . . . ...

  • Page 20: 10 Wiring Diagrams

    Xviii phaser 7750 printer part list 16.13 left cover assembly (ltd) . . . . . . . . . . . . . . . . 9-45 part list 16.14 tray 4/5 lift gear assembly . . . . . . . . . . . . . . . 9-46 part list 16.15 electrical components and caster . . . . . . . . . . . 9-47 part list 16.16 lower tray deck . . . . ...

  • Page 21: A Appendix

    Service manual xix pl 17.5 covers. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11-48 pl 17.6 top cover and eject roll . . . . . . . . . . . . . . . . . . . . . . . 11-50 pl 17.7 paper transport: 1 of 2 . . . . . . . . . . . . . . . . . . . . . . . . 11-52 pl 17.8 paper tr...

  • Page 22

    Xx phaser 7750 printer.

  • Page 23: In This Chapter...

    1 chapter general information in this chapter... ■ phaser 7750 printer configurations ■ parts of the printer ■ phaser 7750 front panel configuration ■ image processor board and rear panel host interface ■ routine maintenance items and consumables ■ printer specifications.

  • Page 24

    1-2 phaser 7750 printer service manual printer introduction and overview the xerox phaser 7750 color laser printer service manual is the primary document used for repairing, maintaining, and troubleshooting the printer. To ensure understanding of this product, complete the xerox phaser 7750 printer ...

  • Page 25

    General information 1-3 phaser 7750 printer configurations a replaceable “configuration chip” holds configuration information that enables or disables built-in features as described below. *requires 7750b to 7750dn upgrade. Features printer configurations 7750b 7750dn 7750gx 7750dxf processor and cl...

  • Page 26: Parts Of The Printer

    1-4 phaser 7750 printer service manual parts of the printer exterior - front view 1. Face down tray 6. Finisher top door h release 2. Front door 7. Finisher output tray 3. Tray 1 (mpt) 8. Finisher door j 4. 2500-sheet high-capacity feeder (1500-sheet lower tray deck not shown) 9. Front door right si...

  • Page 27: Exterior - Rear View

    General information 1-5 exterior - rear view 1. Usb connection 4. Ac power cord connection 2. Ethernet 10/100 base-t connection 5. Latch for left door a 3. Gfi reset button 6. Tray 1 (mpt) in closed position 3 4 5 6 7750-446 1 2.

  • Page 28: Led Indicators:

    1-6 phaser 7750 printer service manual phaser 7750 front panel configuration the printer’s front panel consists of one led, a display window, and six buttons. These buttons are used to navigate the menu system, perform functions, and select modes of operation for the printer. Led indicators: front p...

  • Page 29: Interface

    General information 1-7 image processor board and rear panel host interface the components on the image processor board are illustrated in the following figure. 1. Ram (sodimm) 6. Processor fan 2. Ram (sodimm) 7. Nvram 3. Usb connector 8. Ethernet connector 4. Health leds 5. Hard drive 7750-170 7 4 ...

  • Page 30

    1-8 phaser 7750 printer service manual routine maintenance items and consumables routine maintenance items consumables 1. Transfer roller 6. Toner cartridges 2. Fuser 3. Belt cleaner assembly service parts 4. Imaging units 7. Accumulator belt 5. Waste cartridge consumable capacity is based on 5% per...

  • Page 31: Printer Specifications

    General information 1-9 printer specifications physical dimensions and clearances print engine dimensions value height: 493 mm (19.4 in.) width: 644 mm (25.4 in.) depth: 715 mm (28.15 in.) weight: 91 kg (200 lbs.) 2500-sheet high-capacity feeder dimensions value height: 364 mm (14.3 in.) width: 644 ...

  • Page 32

    1-10 phaser 7750 printer service manual mounting surface specification these specifications apply to any phaser 7750 printer used as a table-top printer, without a lower tray assembly or cart. There are 4 feet on the bottom of the printer. The right hand side of the printer is more susceptible to pr...

  • Page 33

    General information 1-11 3. The printer must not be tipped or tilted more than is shown in the following figure. Failure to adhere to these mounting specifications will void all guarantees of print quality and/or performance. Known problems that can occur as a result of exceeding the mounting surfac...

  • Page 34: Functional Specifications

    1-12 phaser 7750 printer service manual functional specifications electrical specifications characteristic specification printing process the phaser 7750 printer uses lasers with an electrophotographic four-color (cmyk) single pass print process. Color medium four color toner cartridges: cyan, yello...

  • Page 35: Environmental Specifications

    General information 1-13 environmental specifications media and tray specifications for information on approved phaser 7750 media and paper types, print the “paper tips page” from the printer’s front panel. Characteristic specification temperature: operating: 10 to 32 o c storage: -20 to 50 o c humi...

  • Page 36

    1-14 phaser 7750 printer service manual.

  • Page 37: In This Chapter...

    2 chapter theory of operation in this chapter... ■ summary of the phaser 7750 print process ■ paper path of the printer ■ eahg toner ■ technology overview ■ ros and regicon technology overview ■ regicon overview ■ sensors.

  • Page 38

    2-2 phaser 7750 printer service manual summary of the phaser 7750 print process the phaser 7750 color laser printer is a ‘full-color laser printer’, that utilizes electrophotographic recording principles to place a full color image onto the print media. The system contains a drum and developing unit...

  • Page 39

    Theory of operation 2-3 6. Secondary transfer: the image on the accumulator belt is transferred onto the print media using the voltage supplied by the transfer roller. The conductive transfer roller receives a high positive voltage from the hvps that puts it at a higher potential than the accumulato...

  • Page 40: Paper Path of The Printer

    2-4 phaser 7750 printer service manual paper path of the printer the phaser 7750 printer has a c-shaped paper-handling path. The design helps it achieve high production outputs. The paper paths available for the paper exiting the fuser are: ■ straight to the output tray in the top cover (facedown). ...

  • Page 41: Paper Size Sensing

    Theory of operation 2-5 paper size sensing trays 2 through 5 automatically sense the standard size media loaded in the printer by using the paper size sensors mounted on the back inside of the printer. When paper is loaded in the tray and the paper guides are adjusted, the levers on the bottom of th...

  • Page 42: Stack Height Sensing

    2-6 phaser 7750 printer service manual stack height sensing the pick roller feeds the paper to the paper path. As paper continues to feed, the stack height drops. When it reaches a certain level an actuator unblocks the stack height sensor. The control logic then stops paper feed and raises the pape...

  • Page 43: 2-Sided Printing

    Theory of operation 2-7 2-sided printing paper leaving the fuser can be directed to the top output tray or the finisher. If 2-sided (duplex) printing has been selected, paper can be directed through the inverter transport and into the duplex transport. The duplex paper path reverses the direction of...

  • Page 44: Fuser

    2-8 phaser 7750 printer service manual fuser the fuser receives its drive from the main motor. After the toner images are applied to the paper, the paper is then passed through the fuser. The fuser belt is pressed against the heat roller to melt the toner and bond it to the paper. The fuser belt is ...

  • Page 45: Eahg Toner

    Theory of operation 2-9 eahg toner ea (emulsion aggreate high gloss) toner is a relatively new type of toner with particles that are more spherical and uniform in size. This toner will be used for all phaser 7750 printer applications. The image below shows the ea toner particles. The small bumps are...

  • Page 46: Technology Overview

    2-10 phaser 7750 printer service manual technology overview standby power there are two types of standby power in this machine: switched ac and switched dc. Switched power requires that both the circuit breaker and the printer’s main power switch be in the on position. ■ switched ac power - this is ...

  • Page 47: Drive Power

    Theory of operation 2-11 drive power the drive power subsystem includes five motors and their driven assemblies. ■ main motor - the main motor provides the drive for paper feed, black developer housing, and the fuser. The main motor gets 24 vdc power from the +24 volt power supply by way of the inte...

  • Page 48

    2-12 phaser 7750 printer service manual ■ imaging unit motors - there are two imaging unit motors providing drive to the four imaging units: one drives the y, m, and c drums, and the other drives the k (black) drum. Like the main motor, the drum motors get 5 and 24 volt dc power from 5 and 24 volt p...

  • Page 49: System Power Supplies

    Theory of operation 2-13 system power supplies the system power supplies consist of: the t1, t2, and t3 hvps, the 24 volt lvps, 3.3 vdc lvps, and the (2) 5vdc lvps. High voltage power supply/ t2 board ac drive board noise filter board gfi high voltage power supply/ t3 board high voltage power supply...

  • Page 50

    2-14 phaser 7750 printer service manual 24 v low voltage power supply 24 v low voltage power supply fan 3.3 v low voltage power supply 5 v low voltage power supply ac power chassis 7750-448.

  • Page 51: Write Black Process

    Theory of operation 2-15 ros and regicon technology overview the locations of the ros and the ros shutter solenoid are shown in the following figure. ■ there are four ros shutters (not shown). ■ the ros module is field replaceable and contains four laser diodes, one polygon motor/mirror, and several...

  • Page 52

    2-16 phaser 7750 printer service manual in the write black process for the phaser 7750 printer, the four individual images, one in each color, are transferred to the surface of the accumulator belt.The second transfer roller puts a positive charge on the copy paper. Then the four-color image is tran...

  • Page 53: Regicon Overview

    Theory of operation 2-17 regicon overview the regicon procedure is used to ensure that the four lasers in the ros are correctly aligned to provide correct registration for each color. The mark on belt (mob) sensors are used in this procedure to determine the relative position of chevrons developed o...

  • Page 54

    2-18 phaser 7750 printer service manual the chevron patterns used for the regicon setup are shown in the following figure. The components of the regicon adjustment include: ■ skew (fine) setup (pattern 1) ■ in/out setup (pattern 1) ■ center setup (pattern 1) ■ coarse skew setup (pattern 2).

  • Page 55: #1 Skew (Fine) Setup

    Theory of operation 2-19 #1 skew (fine) setup the skew (fine) setup is performed to ensure that images on the accumulator belt are not skewed. To complete this part of the procedure, a series of chevron images are developed on the belt, using all four colors. (pattern 1 on the previous figure shows ...

  • Page 56: View The Regicon Patterns

    2-20 phaser 7750 printer service manual view the regicon patterns it is possible to see the patterns that are developed on the accumulator belt for the regicon calibration by performing the following steps: ■ if there is a finisher present on the machine, slide it to the right so that the right hand...

  • Page 57

    Theory of operation 2-21 ■ reinsert the accumulator belt assembly into the phaser 7750 printer without the stand plate. The area that was covered by the stand plate will be the area in which you see the images on the accumulator belt. ■ with the right hand door interlock activated, turn the printer ...

  • Page 58: Sensors

    2-22 phaser 7750 printer service manual sensors looking at the imaging path illustration below, note that there are two kinds of sensors that play an important role in the control of image quality for the printer. Network cable engine board i/p board internal test patterns imaging unit developer hou...

  • Page 59

    Theory of operation 2-23 7750-461 accumulator belt edge sensor accumulator belt home sensor duplex wait sensor automatic toner concentration sensor k, c, m, y environment sensor automatic density control sensor mark on belt sensor waste cartridge full sensor tray 1 paper size sensor.

  • Page 60: Atc Sensors

    2-24 phaser 7750 printer service manual atc sensors the atc sensor is a part of the developer housing. It provides an indication of the concentration of toner relative to the carrier beads contained in the developer housing. Generally speaking, higher concentrations of toner are more easily develope...

  • Page 61: Adc Sensor

    Theory of operation 2-25 ■ there is a developer problem either with the housing or the amount of beads in the developer. Adc sensor the sensor in this figure is the automatic density control (adc) sensor. It is located on the mob sensor assembly. To control image quality, this sensor looks at patche...

  • Page 62: Adc Output Check

    2-26 phaser 7750 printer service manual ■ determine toner cartridge empty (triggered by atc sensor). 2 patches per color are printed and adc control is initiated at: ■ power-on, return from e nergy s tar , after interlock close. ■ end of each job. ■ within a job (every 80 pages at full speed, every ...

  • Page 63

    Theory of operation 2-27 if the adc shutter fail test detects a problem, check the connector and the shutter for a binding or out of position condition. If these actions do not resolve the problem, replace the mob assembly. If the following values all equal none, the test has detected no problems ■ ...

  • Page 64

    2-28 phaser 7750 printer service manual lower tray feeders sensor and board locations 7750-459 ltd board (3t) hcf board (tt).

  • Page 65: Ltd

    Theory of operation 2-29 7750-462 3 4 5 3 4 5 paper-size switch assembly -tray 3 paper-size switch assembly -tray 4 -tray 5 paper-size switch assembly -tray 3 -tray 4 -tray 5 take-away sensor no-paper sensor/level sensor tray 3 tray 4 tray 5 tray 4 take-away sensor tray 5 take-away sensor tray 4 tak...

  • Page 66: Ltd

    2-30 phaser 7750 printer service manual paper feed sensor actuator tray 4 paper feed sensor actuator tray 5 one way clutch tray 3 tray 4 tray 5 friction clutch tray 3 tray 4 tray 5 paper detect sensor actuator tray 3 tray 4 tray 5 left hand cover interlock switch actuator one way clutch tray 3 tray ...

  • Page 67: In This Chapter...

    3 chapter error messages and codes in this chapter... ■ introduction ■ overview for troubleshooting error codes ■ system startup and post ■ error messages and codes index table ■ error messages and codes procedures.

  • Page 68: Introduction

    3-2 phaser 7750 printer service manual introduction this section covers troubleshooting procedures for the phaser 7750 printer front panel error messages and codes. Only jams and fatal errors will produce an associated numeric code. Error messages and codes are generally specific, making it importan...

  • Page 69: Service Checklist

    Error messages and codes 3-3 service checklist this checklist is an overview of the path a service technician should take to service the phaser 7750 printer and it’s options. Step 1: identify the problem: 1. Verify the problem reported by the customer. 2. Check for any error codes and write them dow...

  • Page 70

    3-4 phaser 7750 printer service manual service rip (every call) procedures these procedures are to be used for every service call. 1. Print an error log then diagnose and repair any problems as indicated. 2. Print a “usage profile” report, then diagnose and repair any problems as indicated. 3. Check...

  • Page 71

    Error messages and codes 3-5 overview for troubleshooting error codes definition of the chain-link codes a chain-link is a numeric code represented as a pair with the chain first and the link second. The “chain” is a 2-digit identifier representing a major or higher level sub- assembly. The “link” i...

  • Page 72

    3-6 phaser 7750 printer service manual general notes on troubleshooting 1. Unless indicated otherwise, the instruction “turn on printer power” means for you to switch on the printer power and let the printer proceed through post to a ‘ready’ condition. 2. When instructed to take resistance readings ...

  • Page 73: System Startup and Post

    Error messages and codes 3-7 system startup and post system boot sequence 1. When the main power switch is turned on, the ‘health’ led on the image processor board turns on immediately. 2. The boot loader checks for ram present and functional. If not, it posts a very large “ram error” on the front p...

  • Page 74: Post Faults

    3-8 phaser 7750 printer service manual ■ the front panel display is cleared. ■ the backlight is turned on with nominal intensity. ■ the post vn.Nn message appears, and tests are quickly executed. ■ if any tests fail, the front panel screen freezes with the name of the test displayed and the line pos...

  • Page 75

    Error messages and codes 3-9 post diagnostic test descriptions test fault type fault code description sdram hard 1 this test fails if the boot loader finds no ram present or faulty ram. Boot loader posts the message “ram error” to the front panel and blinks the front panel led and ip board health le...

  • Page 76

    3-10 phaser 7750 printer service manual error messages and codes index table code error message chain-link page 10 laser unit failure 06-380 06-381 06-382 06-383 06-385 pg. 3-12 11 laser unit polygon motor failure 06-372 pg. 3-12 12 yellow atc sensor failure 09-380 pg. 3-13 13 magenta atc sensor fai...

  • Page 77

    Error messages and codes 3-11 black imaging unit motor failure 04-363 pg. 3-37 78 waste cartridge full detection sensor failure 09-358 pg. 3-38 80 engine logic board failure 04-341 04-343 pg. 3-39 81 controller to engine communication failure 04-358 pg. 3-39 82 engine logic board ram/rom failure 04-...

  • Page 78: Laser Unit Failure, Code 10

    3-12 phaser 7750 printer service manual error messages and codes procedures laser unit failure, code 10 laser unit polygon motor failure, code 11 note if this failure reoccurs three times successively, an engine nvram value is set preventing further printer use until the clear tech rep fault (see pg...

  • Page 79

    Error messages and codes 3-13 yellow atc sensor failure, code 12 magenta atc sensor failure, code 13 cyan atc sensor failure, code 14 the atc sensor detects an insufficient amount of developer. Note if this failure reoccurs three times successively, an engine nvram value is set preventing further pr...

  • Page 80

    3-14 phaser 7750 printer service manual 6 1. Measure the voltage at... Yellow = p405b2 magenta = p405b9 cyan = p405a9 on the engine control board. 2. Is the voltage 0 vdc? Replace the engine control board. Go to step 7. 7 1. Remove the imaging unit plate cover. 2. Inspect the wiring harness between ...

  • Page 81

    Error messages and codes 3-15 black atc sensor failure, code 15 the atc sensor detects an insufficient amount of developer. Note if this failure reoccurs three times successively, an engine nvram value is set preventing further printer use until the clear tech rep fault (see pg. 6-20) is performed. ...

  • Page 82

    3-16 phaser 7750 printer service manual 7 1. Remove the imaging unit plate cover. 2. Inspect the wiring harness between the engine control board and the developer housing assembly. 3. Is the wiring harness defective? Replace the wiring harness. Replace the atc sensor. 8 run approximately 10 pages of...

  • Page 83

    Error messages and codes 3-17 transfer roller contact failure, code 20 transfer roller retract failure, code 21 the transfer roller did not meet the contact position, or the transfer roller did not reach the retract position. Troubleshooting references applicable parts wiring and plug/jack map refer...

  • Page 84

    3-18 phaser 7750 printer service manual 1st btr contact or retract failure troubleshooting references applicable parts wiring and plug/jack map references ■ retract sensor and harness ■ accumulator belt assembly troubleshooting procedure step actions and questions yes no 1 is the retract sensor or a...

  • Page 85: Code 30

    Error messages and codes 3-19 accumulator belt home position took too long, code 30 accumulator belt home position failure, code 31 the accumulator belt home sensor did not detect the belt home signal. Note if this failure reoccurs three times successively, an engine nvram value is set preventing fu...

  • Page 86

    3-20 phaser 7750 printer service manual 2 1. Enter service diagnostics and run the clear tech rep fault (see pg. 6-20) 04-346 procedure. 2. Enter the adjustments/calibrations menu and run the belt edge learn test with the right hand door open and the door interlock held actuated. 3. Does the accumul...

  • Page 87

    Error messages and codes 3-21 8 1. Using a type ii toner vacuum, vacuum out the belt cleaner and waste auger. 2. Is the actuating lever broken off of the belt cleaner toner gate? Replace the belt cleaner assembly. Go to step 9. 9 1. Remove the waste toner cartridge. 2. Enter service diagnostics and ...

  • Page 88

    3-22 phaser 7750 printer service manual accumulator belt edge sensor failure, code 32 accumulator belt drive logic failure, code 34 caution if the accumulator belt is damaged, determine the cause of the damage before installing a new assembly. Troubleshooting references applicable parts wiring and p...

  • Page 89

    Error messages and codes 3-23 6 1. Measure the voltage between the engine control interface board and j533a-9 and frame ground. 2. Does the voltage measure +5 vdc? Go to step 7. Replace in the following order: ■ engine control interface board ■ engine control board 7 1. Measure the voltage between t...

  • Page 90: Code 33

    3-24 phaser 7750 printer service manual unexpected accumulator belt home sensor signal, code 33 caution if the accumulator belt is damaged, determine the cause of the damage before installing a new assembly. Troubleshooting references applicable parts wiring and plug/jack map references ■ accumulato...

  • Page 91

    Error messages and codes 3-25 fuser main lamp failure, code 35 the lamp control circuit has failed resulting in the front thermistor detecting an overheat condition. Note if this failure reoccurs three times successively, an engine nvram value is set preventing further printer use until the clear te...

  • Page 92

    3-26 phaser 7750 printer service manual install or reseat fuser, code 41 front thermistor open error. This is a cold condition. Note if this failure reoccurs three times successively, an engine nvram value is set preventing further printer use until the clear tech rep fault (see pg. 6-20) is perform...

  • Page 93

    Error messages and codes 3-27 fuser sts (front) warm time failure, code 42 main heater warm-up error. The temperature did not reach the “ready” temperature within the specified time. Fuser ssr1 on time failure, code 43 the main heater remained on for more than the specified time. Troubleshooting ref...

  • Page 94

    3-28 phaser 7750 printer service manual 5 is the line voltage present at fs41 on the ac drive board? Go to step 6. Go to step 7. 6 1. Check the wiring harness between fs41 and j600-1 for an open circuit or poor connection. 2. Is the wiring harness ok? Replace the fuser assembly. Replace the ac power...

  • Page 95

    Error messages and codes 3-29 fuser sub lamp overheat failure, code 44 the front thermistor has detected an overheat condition. Note if this failure reoccurs three times successively, an engine nvram value is set preventing further printer use until the clear tech rep fault (see pg. 6-20) is perform...

  • Page 96

    3-30 phaser 7750 printer service manual fuser sts (rear) failure, code 45 rear thermistor open error. The machine logic detected an open circuit in the rear thermistor. Troubleshooting references applicable parts wiring and plug/jack map references ■ fuser ■ engine control board troubleshooting proc...

  • Page 97

    Error messages and codes 3-31 fuser sts (rear) warm time failure, code 46 sub-heater warm-up error. The temperature did not reach “ready” temperature within the specified time. Fuser ssr2 on time failure, code 47 the sub-heater remained on for more than the specified time. Troubleshooting references...

  • Page 98

    3-32 phaser 7750 printer service manual 5 1. Is line voltage present at fs47 on the ac drive board? Go to step 6. Go to step 7. 6 1. Check the wiring harness between fs47 and j600-1 for an open circuit or poor connection. 2. Is the wiring harness ok? Replace the fuser assembly. Replace the ac power ...

  • Page 99: Fan Failure, Code 48

    Error messages and codes 3-33 fan failure, code 48 the machine logic detected a failure of the fuser fan, lvps fan, or rear fan. Troubleshooting references applicable parts wiring and plug/jack map references ■ fuser fan ■ lvps fan ■ rear fan troubleshooting procedure step actions and questions yes ...

  • Page 100

    3-34 phaser 7750 printer service manual 6 does the front panel indicate the fans are on? Replace the rear fan. Check the wiring tot he rear fan, if the wiring is ok, replace the engine control board. 7 does the lvps fan revolve at high speed? The fans are operating correctly. If the problem persists...

  • Page 101

    Error messages and codes 3-35 imaging unit motor failure, code 60 troubleshooting references applicable parts wiring and plug/jack map references ■ imaging unit drive motor ■ engine control board troubleshooting procedure step actions and questions yes no 1 1. Enter service diagnostics and run the i...

  • Page 102: Code 70, 71, 72, 73

    3-36 phaser 7750 printer service manual imaging unit [1] [2] [3] [4] communications failure, code 70, 71, 72, 73 troubleshooting references applicable parts wiring and plug/jack map references ■ imaging unit ■ imaging unit plate assembly troubleshooting procedure step actions and questions yes no 1 ...

  • Page 103

    Error messages and codes 3-37 black imaging unit motor failure troubleshooting references applicable parts wiring and plug/jack map references ■ imaging unit motor ■ engine control interface board ■ engine control board troubleshooting procedure step actions and questions yes no 1 run the black imag...

  • Page 104

    3-38 phaser 7750 printer service manual waste cartridge full detection sensor failure, code 78 troubleshooting references applicable parts wiring and plug/jack map references ■ waste cartridge ■ waste cartridge full sensor ■ engine control board troubleshooting procedure step actions and questions y...

  • Page 105

    Error messages and codes 3-39 engine logic board failure, code 80 controller to engine communications failure, code 81 engine logic board ram/rom failure, code 82 troubleshooting procedure step actions and questions yes no 1 1. Cycle power to the printer to clear the error. 2. Did this clear the err...

  • Page 106

    3-40 phaser 7750 printer service manual engine logic board nvram failure, code 83 controller to engine logic board time failure, code 84 engine logic board micro pitch failure, code 85 high-voltage power supply failure, code 86 troubleshooting procedure step actions and questions yes no 1 1. Cycle p...

  • Page 107

    Error messages and codes 3-41 tray lift failure, code 87 the tray level sensor does not detect that the tray has lifted. Examine the trays and paper feed assemblies for any physical damage before starting the troubleshooting procedure. Troubleshooting references applicable parts wiring and plug/jack...

  • Page 108

    3-42 phaser 7750 printer service manual 6 1. Reseat the paper tray. 2. Does sw1-4: indicate h in any position? Replace the paper feed motor. Replace in order until resolved: ■ paper-select switch assembly ■ engine interface board ■ engine control board 7 1. Pull out and then reseat the problem tray....

  • Page 109

    Error messages and codes 3-43 tray 1/mpt size sensor (7-274), code? An open circuit has been detected in the paper size senor troubleshooting references applicable parts wiring and plug/jack map references ■ tray 1/mpt assembly ■ engine control interface board. ■ engine control board troubleshooting...

  • Page 110

    3-44 phaser 7750 printer service manual lower tray communication failure, code 88 troubleshooting references applicable parts wiring and plug/jack map references ■ engine control interface board ■ tray module board ■ engine control board troubleshooting procedure step actions and questions yes no 1 ...

  • Page 111: Reflective Sensor Procedure

    Error messages and codes 3-45 reflective sensor procedure refer to the figure below during this procedure.. Troubleshooting references applicable parts wiring and plug/jack map references ■ reflective sensor ■ engine control board troubleshooting procedure step actions and questions yes no 1 1. Ente...

  • Page 112

    3-46 phaser 7750 printer service manual transmissive sensor procedure refer to the following figure during this procedure. Troubleshooting references applicable parts wiring and plug/jack map references ■ transmissive sensor ■ engine control board troubleshooting procedure step actions and questions...

  • Page 113

    Error messages and codes 3-47 finisher stapler move sensor on failure, code 111 finisher stapler move sensor off failure, code 112 error code 111: the staple move sensor did not turn on within 2 seconds after the system has started to move to the staple position and the staple move sensor has turned...

  • Page 114

    3-48 phaser 7750 printer service manual 5 is +24 vdc present at p847-4? Replace the finisher control board. Troubleshoot the +24 vdc interlock circuit, using the "troubleshooting the 24 vdc lvps" on page 4-18. Troubleshooting procedure (continued) step actions and questions yes no.

  • Page 115

    Error messages and codes 3-49 finisher stapler failure, code 113 the staple home sensor doesn’t turn on within 2 seconds after the stapler motor started to turn backwards. Troubleshooting references applicable parts wiring and plug/jack map references ■ finisher control board ■ staple unit assembly ...

  • Page 116

    3-50 phaser 7750 printer service manual 7 with the stapler close motor test running is +24 vdc present at j847-7? Replace in the following order: ■ stapler head assembly ■ finisher control board troubleshoot and repair the +24 vdc interlock circuit. Troubleshooting procedure (continued) step actions...

  • Page 117

    Error messages and codes 3-51 front tamper home sensor failure, code 114 with the front tamper home sensor off the front tamper home sensor did not turn on within 800 ms after the move to the front tamper home position has begun. With the front tamper home sensor on the front tamper sensor did not t...

  • Page 118

    3-52 phaser 7750 printer service manual rear tamper home sensor failure, code 115 with the rear tamper home sensor off the rear tamper home sensor did not turn on within 800 ms after the move to the rear tamper home position has begun. With the rear tamper home sensor on the rear tamper sensor did n...

  • Page 119

    Error messages and codes 3-53 finisher stacker height sensor off failure, code 116 the stack height sensor did not detect that the tray went down within 5 seconds after the stacker tray had been signaled to lower down at initialization. Or, the stack height sensor did not detect the tray moving up w...

  • Page 120

    3-54 phaser 7750 printer service manual 7 is +24 vdc present at p/j 847-11 with the finisher stacker motor down test running in diagnostics? Replace the stacker motor. Replace the finisher control board. Troubleshooting procedure step actions and questions yes no.

  • Page 121

    Error messages and codes 3-55 finisher stacker tray failure, code 117 the system detected that the stacker tray upper limit sensor was turned on after the stacker tray began lifting up. Or the stacker tray upper limit sensor remained on after the lowering down of the stacker tray was completed. Trou...

  • Page 122

    3-56 phaser 7750 printer service manual 7 is +24 vdc present at p/j 847-11 with the finisher stacker motor down test running in diagnostics? Replace the stacker motor. Replace the finisher control board. Troubleshooting procedure (continued) step actions and questions yes no.

  • Page 123

    Error messages and codes 3-57 finisher stapler front corner on failure, code 118 finisher stapler front corner off failure, code 119 error code 118: the staple front corner sensor did not turn on within 2 seconds after the system started to move to the front corner. Or the staple front corner sensor...

  • Page 124: Code 120

    3-58 phaser 7750 printer service manual finisher eject clamp home sensor on failure, code 120 finisher eject clamp home sensor off failure, code 121 error code 120: the eject clamp home sensor did not turn on within 5 seconds after the eject clamp up was started. Error code 121: the eject clamp home...

  • Page 125

    Error messages and codes 3-59 finisher decurler failure, code 122 the level of the decurler cam home sensor did not change 4 seconds after the decurler cam clutch has turned on. Troubleshooting references applicable parts wiring and plug/jack map references ■ decurler cam clutch ■ stacker motor ■ fi...

  • Page 126

    3-60 phaser 7750 printer service manual finisher set clamp failure, code 123 the set clamp home sensor did not turn on within 2 seconds after the set clamp started operation. Troubleshooting references applicable parts wiring and plug/jack map references ■ set clamp solenoid ■ finisher control board...

  • Page 127

    Error messages and codes 3-61 finisher communication failure, code 124 there are no diagnostic routines for problems involving serial communications. It is recommended that you address the following assemblies in this order: ■ finisher control board ■ engine control board ■ perform continuity checks...

  • Page 128

    3-62 phaser 7750 printer service manual.

  • Page 129: In This Chapter...

    4 chapter general troubleshooting in this chapter... ■ introduction ■ service diagnostics ■ front panel troubleshooting ■ inoperable printer troubleshooting ■ troubleshooting power supplies and interlocks ■ media jams and the paper path ■ operating system and application problems.

  • Page 130: Introduction

    4-2 phaser 7750 printer service manual introduction this chapter covers the general startup, postscript, and power supply operations of the printer to aid in troubleshooting problems not associated with an error code or front panel error message. For troubleshooting problems associated with an error...

  • Page 131

    General troubleshooting 4-3 service diagnostic front panel button descriptions service diagnostic tests table button function back returns to the prior higher level menu structure, if available. If help text is displayed on the front panel, pressing back restores the current menu item and remove the...

  • Page 132

    4-4 phaser 7750 printer service manual jam info no static jam detected or static jam: area name location of jam back or cancel to exit.> fault history text: mmm : is a service defined numeric code, see "service usage profile status codes" on page a-5 for code definitions. Text is the fault descripti...

  • Page 134

    4-6 phaser 7750 printer service manual jam sensors lh low cover area is l lh cover area is l lh fuser area is l duplex cover area is l tray left cover area is l tray #3 area is l tray #4 area is l tray #5 area is l (f) fin compiler cover area l (g) fin compiler safety area l (h,j) fin front cover ar...

  • Page 135

    General troubleshooting 4-7 btr sensors btr y is l btr m is l btr c is l btr k is l 1st btr is l 2nd btr is l h = error l = no error adc sensor adc is xxx adc = automatic density correction go to adc output check under adjustments and calibration. Toner waste cartridge waste cartridge presence is h ...

  • Page 136

    4-8 phaser 7750 printer service manual finisher sensors interlocks left-hand cover is l top cover is l docking is h horiz. Transport is l horizontal transport entry is l exit is l iot full is l compiler tray exit is l paper is l cover safety switch is l stacker no paper is l height is h upper limit ...

  • Page 137

    General troubleshooting 4-9 steering motor do you wish to continue? Yes no motor on motor off please cycle power to the printer now! Caution to avoid damaging the accumulator belt, it is recommended that you leave the belt installed and perform the belt edge learn test instead, see "belt edge learn"...

  • Page 138

    4-10 phaser 7750 printer service manual offset motor direction: forward backward press up/down to change setting. Color developer motor developer motor developer motor is on turn motor off all motors off dispensor motor disp. Motor: yellow magenta cyan black note only run this test onceper power cyc...

  • Page 139

    General troubleshooting 4-11 clutch tests tests functionality of clutches by activating one clutch at a time. Take-away clutch clutch on clutch off all tests are activated by pressing ok. Listen for the clutch. Test times out after 1 second. Developer clutch clutch on clutch off registration clutch ...

  • Page 140

    4-12 phaser 7750 printer service manual adc output check measuring: result = 0 stop status = 0 adc sensor fail = 0 adc shutter fail - 0 this tests the automatic density correction sensor. Tone up/down measuring: result = 0 status = 0 atc sensor fail = none atc limit warn = none atc change warn = non...

  • Page 141

    General troubleshooting 4-13 store engine nvram **writes data to hd** are you sure? Yes no this takes data from engine nvram and stores it onto the drive. See "store engine nvram" on page 6-21. Exit exits to postscript without running post. Test front panel display test operation definition.

  • Page 142: Front Panel Troubleshooting

    4-14 phaser 7750 printer service manual front panel troubleshooting the printer does not come to a “ready” state printer does nothing when power is switched on see "troubleshooting ac power" on page 4-16. Lvps, fuser, and ros fans on, front panel led does not come on 1. Observe the blinking pattern ...

  • Page 143: Messages

    General troubleshooting 4-15 front panel displays "fatal fault encountered" message see the procedure for "controller to engine communications failure, code 81" on page 3-39. Inoperable printer troubleshooting false lh door, rh door, front door open, or imaging units missing messages see the "troubl...

  • Page 144: Interlocks

    4-16 phaser 7750 printer service manual troubleshooting power supplies and interlocks troubleshooting ac power note the gfi, noise filter, and ac drive board are all part of the ac electrical chassis. Actions 1. Check the ac input voltage at the outlet. 2. Reconnect ac power. If the gfi trips immedi...

  • Page 145

    General troubleshooting 4-17 troubleshooting the low-voltage power supplies 3.3 vdc, 5 vdc and 24 vdc voltages are supplied by individual low-voltage power supply boards. The 24 vdc lvps requires the presence of a 5 vdc enabling signal to operate. Note before troubleshooting power supply problems, d...

  • Page 146: Voltage Power Supplies

    4-18 phaser 7750 printer service manual troubleshooting the +3.3 vdc and (2) +5 vdc low- voltage power supplies note switch off power and disconnect the power cord. Troubleshooting the 24 vdc lvps note switch off power and disconnect the power cord. The 24 vdc lvps requires a 5 vdc enable signal to ...

  • Page 147: Interlock Circuit Diagram

    General troubleshooting 4-19 interlock circuit diagram the +24 vdc interlock circuit the 24 vdc interlock circuit runs from the 24 vdc lvps to the l/h door interlock switch, the r/h door interlock switch, and the front door interlock switch back to the engine control interface board, then into the e...

  • Page 148: The +5 Vdc Interlock Circuit

    4-20 phaser 7750 printer service manual the +5 vdc interlock circuit the 5 vdc interlock circuit runs from the 5 vdc lvps to the l/h door switch, then to the engine control interface board, out to the r/h door switch, back to the engine control interface board, out to the front door, through the coi...

  • Page 149: Media-Based Problems

    General troubleshooting 4-21 media jams and the paper path media-based problems ■ print the paper tips page from the printer’s front panel for a list of the supported media types and weights. The customer should be using a quality laser printer paper. The printer may have trouble picking smooth-fini...

  • Page 150: Fuser Jams

    4-22 phaser 7750 printer service manual 2. Feed paper through the printer from each of the available trays, including tray 1/mpt. Is the paper damaged when fed out of one tray but not when fed out of the others? If so, inspect the tray for damage, ensure that the media guides are set correctly and v...

  • Page 151: Troubleshooting (Tcp/ip)

    General troubleshooting 4-23 operating system and application problems windows 2000, windows xp, windows server 2003 troubleshooting (tcp/ip) note for windows xp, select classic look or the windows xp procedures will not match the steps below. To select classic look, click start, then settings, then...

  • Page 152: Printing A Test Page

    4-24 phaser 7750 printer service manual 2. Verify that the client is logged into the network and printing to the correct print queue. The user should also have access to the phaser printer queue. Verifying driver installation 1. Right-click my network places on the desktop, then click properties. 2....

  • Page 153: Verifying Installation

    General troubleshooting 4-25 ■ subnet mask is set correctly (if used). ■ default gateway is set correctly (if used). ■ lpr is enabled. Verify that the lpr and appsocket settings are set as desired. ■ interpreters: auto, pcl, or postscript (depending on your driver). 2. Verify that the client is logg...

  • Page 154: Verifying Settings

    4-26 phaser 7750 printer service manual ■ verified that the printer is receiving network traffic by monitoring the led’s on the back of the printer or on the centredirect external print server. When the printer is connected to a functioning network and receiving traffic, its link led is green, and i...

  • Page 155: Versions 10.1 And 10.2)

    General troubleshooting 4-27 macintosh troubleshooting (mac os 9.X, mac os x, versions 10.1 and 10.2) the following procedure eliminates cabling, communication, and connection problems. Once you complete these steps, print a test page from your software application. If the job prints, no further sys...

  • Page 156: Requirements

    4-28 phaser 7750 printer service manual mac os x, versions 10.1 and 10.2 perform these steps only for mac os x, versions 10.1 and 10.2: 1. Open the network utility, then click the ping tab. 2. Enter your printer’s ip address. 3. Click ping. If you do not get a response, confirm that your tcp/ip sett...

  • Page 157

    General troubleshooting 4-29 novell netware troubleshooting quick check 1. Verify that the printer is plugged in, turned on, and connected to an active network. 2. Verify that the printer is receiving network traffic by monitoring the leds on the back of the printer. When the printer is connected to...

  • Page 158

    4-30 phaser 7750 printer service manual novell netware hardware step-by-step note the led activity on the printer. The green link led is on whenever it is connected to an active network. The amber traffic led is flickering when data is being received. 1. Verify the following: ■ the cable connections...

  • Page 159

    General troubleshooting 4-31 2. Click start, click settings, then click printers to verify that the printer is installed. Launching centreware dp 1. Click start, click programs, then click centreware dp. 2. Select the desired printer. If a communications error message appears, your printer is not ab...

  • Page 160

    4-32 phaser 7750 printer service manual.

  • Page 161: In This Chapter...

    5 chapter print-quality troubleshooting in this chapter... ■ print-quality problems overview ■ front panel test prints ■ service test prints ■ print engine only test print ■ print-quality troubleshooting.

  • Page 162: The Ros

    5-2 phaser 7750 printer service manual print-quality problems overview print-quality defects can be attributed to printer components, consumables, media, internal software, external software applications and environmental conditions. To successfully troubleshoot print-quality problems, as many varia...

  • Page 163: The Imaging Units

    Print-quality troubleshooting 5-3 the imaging units potential defects (usually single color): ■ spots ■ deletions ■ bands ■ repeating defects - 44 mm (1.7 in.) or 94 mm (3.7 in.) the developer housings potential defects (usually single color): ■ bead carryout (grit on copy) ■ spots ■ deletions ■ mot...

  • Page 164: Paper And Paper Trays

    5-4 phaser 7750 printer service manual paper and paper trays potential defects (all colors): ■ mottled image (low quality or damp paper) ■ creases and folds front panel test prints a variety of test prints are available from the front panel’s troubleshooting menu to aid in determining the quality of...

  • Page 165: Color Test Pages

    Print-quality troubleshooting 5-5 color test pages selecting “color test pages” causes a group of seven pages to print as shown in the following two figures. This group includes a full page each of 25% cmyk, a page of 80% solid fill red, a page consisting of 25% tint vertical cmyk bands with each ba...

  • Page 166: Analyzing The Test Pattern

    5-6 phaser 7750 printer service manual analyzing the test pattern 1. Color registration (horizontal): the colored lines should match up as shown below. If necessary see the registration procedures in chapter 6. 2. Color registration (vertical): the colored lines should match up as shown below. If ne...

  • Page 167: Solid Fill Pages

    Print-quality troubleshooting 5-7 solid fill pages selecting “solid fill pages” causes a group of six pages, as shown below, to print that consist of 80% solid fill on individual pages of cmyk for primary colors and bg for secondary. 7750-182.

  • Page 168: Repeating Defects Page

    5-8 phaser 7750 printer service manual repeating defects page the “repeating defects page” provides a measurement tool that allows you to match the spacing between repeated defects on the printed pages with the component that would cause such spacing to occur. Instructions for using the repeating de...

  • Page 169: Engine Test Prints

    Print-quality troubleshooting 5-9 engine test prints these features are available from the service diagnostics/built-in test prints menu. If the “engine test prints” are rendered correctly and other test prints are defective, the problem is not on the engine board. Paper path options selecting paper...

  • Page 170: Print Halftones

    5-10 phaser 7750 printer service manual print halftones selecting “print halftones” causes a group of six pages to print that consist of 80% solid fill on individual pages of cmyk for primary colors and rg for secondary. Colors should be uniform from top to bottom of the page with no mottling and th...

  • Page 171: Print Fast Scan 8 Tone

    Print-quality troubleshooting 5-11 print fast scan 8 tone prints one sheet each of ymck six distinct graduated bands of the color forming a block in the center of the page and a seventh band, with density that falls between the two lightest in the block, located at the bottom of the page. The variat...

  • Page 172: Print-Quality Problems:

    5-12 phaser 7750 printer service manual initial actions before troubleshooting any print-quality problems: ■ print a “paper tips page” to verify the media being used is supported by the printer and the tray being used. ■ verify the media settings are correct in both the printer driver software and a...

  • Page 173

    Print-quality troubleshooting 5-13 light or undertone prints in all colors the overall image density is too light in all colors. 1. Verify the transfer roller has not reached its end-of-life. 2. Run the calibrate for paper routine. 3. Check the accumulator belt assembly for mis-alignment 4. Replace ...

  • Page 174: Blank Prints

    5-14 phaser 7750 printer service manual blank prints the entire image area is blank. 1. Generate a 100% “solid fill test” print from the front panel. 2. Open the door in the middle of the print job. Is there toner on the accumulator belt? 3. Enter service diagnostics and test the shutter motor. Does...

  • Page 175

    Print-quality troubleshooting 5-15 one color is faded or missing 1. Under high toner-coverage conditions, toner may be depleted during the toner low state but before the toner out message is displayed 2. Is the toner low or near empty? Remove the toner cartridge and inspect the top of the feed tube....

  • Page 176

    5-16 phaser 7750 printer service manual missing band in direction of paper travel, all colors there are areas of the image that are extremely light or are missing entirely. These missing areas form wide bands from leading edge to trailing edge (b-size print shown). The printer displays no error code...

  • Page 177

    Print-quality troubleshooting 5-17 streaks in direction of paper travel there are dark lines running along the page in the direction of paper travel from the leading edge to the trailing edge (b-size print shown). The printer displays no error code. Note a-size prints are processed through the print...

  • Page 178

    5-18 phaser 7750 printer service manual streaks parallel with the leading edge there are dark lines running parallel with the leading edge of the print, perpendicular to direction of paper travel (b-size print shown). The printer displays no error code. Note a-size prints are processed through the p...

  • Page 179: Banding

    Print-quality troubleshooting 5-19 banding 1. Print the “repeating defects pages”. 2. Replace the unit of the affected color, using the repeating defects page. 3. If the defect still appears in the same color, the problem is the developer. 4. If all colors, the problem is with the accumulator belt, ...

  • Page 180

    5-20 phaser 7750 printer service manual repetitive mark appears on each print an identical mark or image appears on each, or every other, printed image. From the front panel’s troubleshooting menu, select print quality problems , then select remove print smears . This function passes several blank s...

  • Page 181: Random Missing Spots

    Print-quality troubleshooting 5-21 random missing spots there are small areas of the image that are extremely light or are missing entirely. These missing areas form spots that are localized to small areas of the page. The printer displays no error code. A small number of occasional missing spots is...

  • Page 182: Background Contamination

    5-22 phaser 7750 printer service manual background contamination there is toner contamination on all or most of the page. The contamination appears as a very light gray dusting. The printer displays no error code. 1. Ensure that the loaded media matches the front panel settings. In some cases, switc...

  • Page 183

    Print-quality troubleshooting 5-23 unfused image or image easily rubs off of page the toner image is not completely fused to the paper. The image easily rubs off. The printer displays no error code. 1. Make sure that the paper you are using is the correct type for the printer and is correctly loaded...

  • Page 184: Toner On Back Of Print

    5-24 phaser 7750 printer service manual toner on back of print there is toner on the back of the printed sheet of paper. 1. Clean the printer interior. 2. Inspect the paper that is loaded in the paper trays. Is the paper clean and free of toner? 3. Try printing from supported media. 4. Ensure that t...

  • Page 185: Print Is Mottled

    Print-quality troubleshooting 5-25 print is mottled the printed image has a mottled appearance. 1. Ensure that the paper is in good condition and appropriate for a laser printer. 2. Ensure that the loaded media matches the front panel settings. Also check the media selected in the printer driver. 3....

  • Page 186

    5-26 phaser 7750 printer service manual image mis-registered on paper the image area is not centered on the page or the image is bleeding off of the page. The printer displays no error code. 1. Run the “configuration page” or “startup page” to verify the hard drive, application, and driver settings ...

  • Page 187: Residual Image Or Ghosting

    Print-quality troubleshooting 5-27 residual image or ghosting there are faint, ghostly images appearing on the page. The images may be either from a previous page or from the page currently being printed. The printer displays no error code. 1. Make sure that the paper you are using is the correct ty...

  • Page 188

    5-28 phaser 7750 printer service manual.

  • Page 189: In This Chapter...

    6 chapter adjustments and calibrations the engine firmware has several built-in diagnostic routines that perform various alignment and calibration procedures. The printer is shipped aligned, registered and calibrated. In this chapter... ■ registration control (regicon) adjustment overview ■ regicon ...

  • Page 190: Overview

    6-2 phaser 7750 printer service manual registration control (regicon) adjustment overview the regicon tests are the means by which registration is accomplished. Registration establishes the alignment of the four primary colors in the process and scan directions, tilt or skew, length of lines and lin...

  • Page 191: In/out Skew Adjustment

    Adjustments and calibrations 6-3 coarse and fine skew adjustments skew error is the misalignment of one or more of the four scan lines (c, m, y & k). During the regicon #4 (coarse) and regicon #1 (fine) adjustments, the front side of each line is adjusted to be level with the rear end. In/out skew a...

  • Page 192: Center Skew Adjustment

    6-4 phaser 7750 printer service manual center skew adjustment the center skew adjustment (magnification balance) adjusts the linearity of the scan lines. During regicon #3, the printer measures a specific midpoint of each scan line and adjusts it to a horizontal reference midpoint. Figure 4: magnifi...

  • Page 193

    Adjustments and calibrations 6-5 regicon adjustment procedures note for the following procedures, you must perform certain steps prior to, during, and after the tests are run. The following information is vital to the process and must be followed in order for each procedure to function properly. ■ r...

  • Page 194

    6-6 phaser 7750 printer service manual 4 1. Perform the "regicon #2 in/out skew adjustment" on page 6-8. 2. Do the results indicate the test has passed? Perform skew correction adjustments as indicated in the panel data until less that +/- 5 clicks are required for each color. Go to step 5. Go to st...

  • Page 195

    Adjustments and calibrations 6-7 regicon #1 fine skew adjustment this process uses sensors to examine the regicon image on the belt and report what adjustments need to be made. A side effect of this test is that horizontal and vertical alignments are automatically done (if the test passed). The data...

  • Page 196

    6-8 phaser 7750 printer service manual 6. After 2 minutes, the test selection menu will re-appear. To examine the test results after this occurs, highlight the appropriate test and press the information button. The display results are the same as previously except that do #1: fine skew setup appears...

  • Page 197

    Adjustments and calibrations 6-9 5. If an adjustment is needed, adjust by the amounts displayed on the front panel. 6. After 2 minutes, the test selection menu will re-appear. To examine the test results after this occurs, highlight the appropriate test and press the information button. The display ...

  • Page 198: When Regicon #3 Fails

    6-10 phaser 7750 printer service manual 9. Wait until the test results are displayed as follows: note if the block counts are not the same number as presented here, the printer has a print-quality problem. See "streaks in direction of paper travel" on page 5-17 to resolve the print-quality problems ...

  • Page 199

    Adjustments and calibrations 6-11 4. Wait until the test results are displayed as follows: note if the block counts are not the same number as presented here, the printer has a print-quality problem. See "streaks in direction of paper travel" on page 5-17 to resolve the print-quality problems before...

  • Page 200

    6-12 phaser 7750 printer service manual coarse regicon initialization 1. From the hidden service menu, highlight run service diagnostics and press ok. Wait for the printer to initialize in the service diagnostics mode. 2. Highlight the adjustments/calibrations menu and press ok. 3. From the select a...

  • Page 201

    Adjustments and calibrations 6-13 direction of scan from left to right as the “fast ” direction. The direction from the bottom of the print to the top is referred to as the “slow” direction. D. Notice which vertical line color(s) on the print needs to be moved right or left to line up as closely as ...

  • Page 202: Atc Sensor Setup

    6-14 phaser 7750 printer service manual atc sensor setup the automatic toner concentration (atc) sensor measures the toner to bead ratio in each developer. These sensors have an intrinsic gain and output value that are stored in printer nvram. New values must be entered when a new developer housing ...

  • Page 203: Additional Information

    Adjustments and calibrations 6-15 additional information for information on the following topics, see, "service diagnostics" on page 4-2. ■ trc adjust ■ adc output check - check adc sensor fail = 0 ■ tone up/down - check atc sensor fail = none ■ laser power check ■ pwm mapping - for engineering use ...

  • Page 204: Resetting Nvram

    6-16 phaser 7750 printer service manual resetting nvram resetting nvram returns all the image processor’s nvram-stored parameters to their factory defaults except the print counts and the adobe firmware serial number. You can reset both the postscript and engine nvram using the postscript menu or th...

  • Page 205: Resetting Engine Nvram

    Adjustments and calibrations 6-17 restore factory settings (margins) you can reset margin settings to the factory-default values. Caution use caution when resetting margins to the factory-default settings. Changing these settings back to factory defaults may not be the last-saved settings if you hav...

  • Page 206

    6-18 phaser 7750 printer service manual resetting paper handling defaults resetting the paper handling defaults resets the paper source, paper destination, job offset, stapling options, print-quality mode, 2-sided printing, image smoothing and tekcolor corrections to their default values. 1. From th...

  • Page 207: Postscript Nvram Reset

    Adjustments and calibrations 6-19 the printer prompts the user to reset the life counts if the assembly is replaced after receiving a replace transfer roller or replace transfer roller soon message. 1. From the main menu, highlight information and press ok. 2. Highlight supplies info and press ok 3....

  • Page 208: Clear Tech Rep Faults

    6-20 phaser 7750 printer service manual clear tech rep faults the following printer faults can occur during normal operation, and the normal procedure is to isolate and repair the problem. However, with these particular faults, an additional step is required. A value has been written in the engine n...

  • Page 209: Store Engine Nvram

    Adjustments and calibrations 6-21 6. Highlight reset engine nvram and press ok. 7. Select the specific entry desired (yes or no) and press ok. Store engine nvram this function reads values from the engine nvram and writes values to the hard drive. It overwrites nvram values stored on the hard drive....

  • Page 210

    6-22 phaser 7750 printer service manual.

  • Page 211: In This Chapter...

    7 chapter cleaning and maintenance in this chapter... ■ service preventive maintenance procedure ■ recommended tools ■ cleaning.

  • Page 212: Recommended Tools

    7-2 phaser 7750 printer service manual service preventive maintenance procedure perform the following procedures whenever you check, service, or repair a printer. Cleaning the printer, as outlined in the following steps, assures proper operation of the printer and reduces the probability of having t...

  • Page 213: In This Chapter...

    8 chapter service parts disassembly in this chapter... ■ overview ■ general notes on disassembly ■ disassembly procedures.

  • Page 214: Overview

    8-2 phaser 7750 printer service manual overview this section contains the removal and replacement procedures for selected parts of the printer according to the service parts list. Not all replacement procedures are included in this service manual. In most cases, to reinstall a part, simply reverse t...

  • Page 215

    Service parts disassembly 8-3 general notes on disassembly before you begin any disassembly procedure: 1. Switch off the printer power and disconnect the power cord from the wall outlet. 2. Remove the imaging units and protect them from exposure to light by covering with a light proof bag or by plac...

  • Page 216: Covers

    8-4 phaser 7750 printer service manual covers right side cover 1. Open the front cover. 2. Remove 3 screws; 1 screw is located behind the right-hand door. 3. Lightly press downward to release the four hidden tabs behind the right side cover, then pull the cover away from the printer. S7700-033 right...

  • Page 217: Top Cover And Front Panel

    Service parts disassembly 8-5 top cover and front panel 1. Remove the right side cover, see page 8-4. 2. Remove 2 screws visible on the right side of the top cover. 3. Open the front cover and remove 1 front screw holding the top cover. 4. Remove the plastic access cover, then remove the image proce...

  • Page 218: Rear Cover

    8-6 phaser 7750 printer service manual rear cover 1. If an auxiliary feeder has been installed, open the auxiliary feeder connection cover and disconnect the auxiliary feeder wiring harness before removing the rear cover. 2. Remove 4 screws securing the rear cover to the printer. 3. Pull the top edg...

  • Page 219: Top Rear Cover

    Service parts disassembly 8-7 top rear cover 1. Remove the rear cover, see page 8-6. 2. Open the left-hand door a. 3. Loosen 1 screw from the top rear cover. 4. There is a hidden captive tab on the front and side of this cover that resists the upward pull. Place your finger on the front side of the ...

  • Page 220

    8-8 phaser 7750 printer service manual left-hand lower cover assembly 1. Open the left-hand lower cover. 2. Disconnect the wiring harness and free from the clamp near the rear pivot. Note note the positioning of the wiring harness for reinstallation. 3. With a flat tip screwdriver, pry out the pivot...

  • Page 221: Reinstallation Procedures:

    Service parts disassembly 8-9 tray 1 / multi-purpose tray (mpt) 1. Remove the rear and mid covers, see page 8-6. 2. Open the left-hand cover. Note note the routing of the wiring harness. The wiring harness feeds through the access hole at the pivot point and up to the connector. When reassembling, b...

  • Page 222

    8-10 phaser 7750 printer service manual tray 1 / mpt paper pick rollers 1. Open the left hand door a and locate the pick rollers near the duplex chute. 2. Lift the tab and slide the white retainers away from the pick rollers. 3. Slide the pick rollers off the retaining pins. 4. Lift and remove the p...

  • Page 223

    Service parts disassembly 8-11 left cover assembly (left hand door a) 1. Remove the rear cover, see page 8-6. 2. Remove the left hand rear mid cover, see page 8-7. 3. Remove tray 1 /(mpt), see page 8-9. 4. Remove the fuser front cover. 5. Open the left cover. 6. Remove 1 screw from the plastic harne...

  • Page 224: Replacement Procedure

    8-12 phaser 7750 printer service manual replacement procedure note reinstall the door on the hinge pins and manually align the marks on the motion damper before completing the installation. Failure to align the gears can result in binding and gear damage. . When reassembling, align the marks on the ...

  • Page 225: Duplex Chute

    Service parts disassembly 8-13 duplex chute 1. Remove tray 1/(mpt), see page 8-9. 2. Open the left hand door a. 3. Rotate the duplex chute downward until the keyed pivot shaft can be removed from the pivot bracket. 4. Remove the duplex chute. Note the duplex chute must be in the up position to insta...

  • Page 226: Inverter Transport Assembly

    8-14 phaser 7750 printer service manual inverter transport assembly 1. Open the left-hand cover assembly (left door). 2. Remove the e-clip and remove the roller assembly. 3. Remove 2 screws securing the inverter transport assembly to the left-hand door and remove the inverter transport assembly. 775...

  • Page 227

    Service parts disassembly 8-15 registration transport assembly note do not remove the 2 inside screws. 1. Remove left hand door a, see page 8-11. 2. Remove the 2 screws from the plastic flanges that secure the transport assembly in the printer frame. Note note the wiring harness position for reinsta...

  • Page 228: Shutter Solenoid Assembly

    8-16 phaser 7750 printer service manual shutter solenoid assembly 1. Remove tray 1/ (mpt), see page 8-9. 2. Remove the registration transport assembly, see page 8-15. 3. For easier access you can remove the duplex chute, see page 8-13. 4. Disconnect the wiring harness from the front frame connector....

  • Page 229: Removal Of Motor

    Service parts disassembly 8-17 tray 1 feeder assembly and paper lift motor 1. Remove the left-hand lower cover assembly. 2. Open tray 1 halfway. 3. Disconnect the wiring harness. 4. Remove the 2 screws holding the tray 1 feeder assembly, not the screws securing the lower tray bracket. 5. Remove the ...

  • Page 230

    8-18 phaser 7750 printer service manual waste cartridge sensor holder 1. Open the front door. 2. Open the waste cartridge cover. Note to avoid a toner spill, use care in removing the waste cartridge. 1. Remove the waste cartridge. 2. Remove 1 screw securing the waste cartridge pivot hinge and remove...

  • Page 231: Imaging Unit Plate Cover

    Service parts disassembly 8-19 imaging unit plate cover 1. Open the front door. 2. Remove fuser front cover. 3. Lower the main lever. 4. Slide imaging units 1 and 3 out slightly. 5. Remove 4 black screws. 6. Remove the plastic imaging unit plate cover. 7750-244.

  • Page 232: Dispense Assembly

    8-20 phaser 7750 printer service manual dispense assembly note use only a type ii toner vacuum to clean up toner spills. Have a drop cloth available to place the removed assemblies on. Caution the dispense assemblies overlap and must be removed in the following order: y - m - c - k, then reinstalled...

  • Page 233

    Service parts disassembly 8-21 5. Pull the shut off gate of each toner cartridge toward you approximately 3/4” (or 20mm) to shut off the toner supply for each toner tube (see figure 8-26, “dispense assembly,” on page 8-29). Caution be careful when moving the stops, they are easily broken and may com...

  • Page 234: Imaging Unit Plate Assembly

    8-22 phaser 7750 printer service manual imaging unit plate assembly caution the imaging units are very light sensitive. Store away from light. Do not touch the surface of the imaging units. 1. Remove the imaging units. 2. Leave the main lever down. 3. Remove the waste cartridge sensor holder, see pa...

  • Page 235

    Service parts disassembly 8-23 8. Remove the 6 chrome plated screws that secure the plate to the frame. Note complete removal of the imaging unit plate assembly is not required for removal of the developer(s). Tilt the imaging unit plate assembly forward enough to allow the developer(s) to be remove...

  • Page 236: Replacement Procedure

    8-24 phaser 7750 printer service manual replacement procedure note ensure the developer assemblies are fully and evenly seated when reinstalling the imaging unit plate assembly. There is a locating pin at the back of each developer housing assembly. Lightly tug the wires to ensure that they are not ...

  • Page 237: Developer Housing Assembly

    Service parts disassembly 8-25 developer housing assembly note complete removal of the imaging unit plate assembly is not required for removal of the developer(s). Tilt the imaging unit plate assembly forward enough to allow the developer(s) to be removed. Do not disconnect the imaging unit plate ha...

  • Page 238

    8-26 phaser 7750 printer service manual recharging a developer housing assembly caution if replacing a developer housing assembly, write down the new atc tag number. Remove the tear-off atc tag number label, and adhere it near the appropriate imaging unit connector on the imaging unit plate assembly...

  • Page 239

    Service parts disassembly 8-27 1. Place the developer housing assembly (new or used) to be recharged on a drop cloth. Caution during this procedure, the developer housing assembly must be kept level at all times. To prevent toner spillage, it is recommended that the developer housing assembly be ful...

  • Page 240

    8-28 phaser 7750 printer service manual toner dispense motor assembly 1. Remove the right cover, see page 8-4. 2. Remove the top cover assembly, see page 8-5. 3. Remove the dispense housing assemblies, see page 8-20. 4. Remove the 2 screws that secure the toner dispense motor assembly to the printer...

  • Page 241: Steering Drive Assembly

    Service parts disassembly 8-29 steering drive assembly 1. Remove the imaging units and imaging unit plate cover, see page 8-22. 2. Disconnect the wiring harness. 3. Remove the 3 screws securing the steering drive assembly and remove the assembly from the printer. Replacement procedures note you may ...

  • Page 242: Mark-On-Belt (Mob) Sensor

    8-30 phaser 7750 printer service manual mark-on-belt (mob) sensor 1. Remove the waste cartridge assembly. 2. Remove the imaging unit plate cover, see page 8-19. 3. Remove the waste toner agitator motor. 4. Remove the left-hand inner cover. 5. Remove the waste cartridge sensor holder, see page 8-18. ...

  • Page 243: Exit Transport Assembly

    Service parts disassembly 8-31 exit transport assembly 1. Remove the rear cover, see page 8-6. 2. Remove the left-hand top cover, see page 8-8. 3. Remove the fuser front cover. 4. Open left-hand cover. 5. Remove the 1 screw securing the transport assembly cover and remove the cover. 6. Disconnect th...

  • Page 244: Fuser Fan Assembly

    8-32 phaser 7750 printer service manual fuser fan assembly 1. Remove the rear cover, see page 8-6. 2. Remove the top cover, see page 8-5. 3. Remove the right side cover. 4. Note the routing of the wiring harness. Note it is easier to re-install the wire harness if the fuser fan and plastic mounting ...

  • Page 245

    Service parts disassembly 8-33 accumulator belt mounting frame 1. Remove the accumulator belt assembly. 2. Remove the imaging units and protect from light. 3. Remove the imaging unit plate cover. 4. Remove the steering drive assembly. 5. Remove the fuser. 6. Remove the registration assembly. 7. Remo...

  • Page 246: Belt Cleaner

    8-34 phaser 7750 printer service manual belt cleaner 1. Open the right-hand door. 2. Open the front cover and lower the main lever. 3. Lift the accumulator belt locking lever and pull the assembly out a few inches. 4. Using a 2.5 mm hex driver remove the 2 screws on the left side of the belt cleaner...

  • Page 247: Waste Auger Assembly

    Service parts disassembly 8-35 waste auger assembly 1. Remove the right side cover, see page 8-4. 2. Remove the waste cartridge and lower the main lever. 3. Remove accumulator belt assembly, see page 8-34. 4. Return the main lever to its upright position. 5. Remove 2 screws securing the waste auger ...

  • Page 248: Laser Unit (Ros)

    8-36 phaser 7750 printer service manual laser unit (ros) 1. Remove the rear cover, see page 8-6. 2. Remove the right side cover, see page 8-4. 3. Disconnect the wiring harnesses at engine board p400 and 401. 4. Undo the retainers and undo the wiring harness. Note observe the routing of the laser uni...

  • Page 249: Replacement Procedures

    Service parts disassembly 8-37 replacement procedures note you must perform the regicon adjustment procedures after replacing the laser unit, see "regicon adjustment procedures" on page 6-5. Note store the nvram values to the hard drive after calibration. See "store engine nvram" on page 6-21..

  • Page 250: Image Processor Board

    8-38 phaser 7750 printer service manual image processor board 1. Turn the power off and unplug the printer. Caution the image processor board is susceptible to esd damage. Observe proper esd precautions. 2. Disconnect all communication cables. 3. Remove 4 screws securing the image processor board an...

  • Page 251: Internal Hard Drive

    Service parts disassembly 8-39 internal hard drive caution the internal hard drive is susceptible to esd damage. Observe proper esd precautions. 1. Remove the image processor board. 2. Using a t-10 torx bit, remove 4 screws from the bottom side of the image processor board holding the internal hard ...

  • Page 252

    8-40 phaser 7750 printer service manual electrical chassis (card cage) assembly note before removing the electrical chassis assembly, it is recommended you store the engine nvram data to the hard drive. See "store engine nvram" on page 6-21. 1. Remove the right cover, see page 8-4. 2. Remove the top...

  • Page 253: Replacement Procedures

    Service parts disassembly 8-41 10. Lift and tilt the cage assembly to release it from the engine control interface board connector below the cage assembly and remove the assembly. Replacement procedures note before re-installing the assembly, widen the gap in each of the two white nylon retainers to...

  • Page 254: Engine Control Board

    8-42 phaser 7750 printer service manual engine control board 1. Store the engine board nvram values to the hard drive. See "store engine nvram" on page 6-21. 2. Remove the electrical (card cage) assembly, see page 8-40. 3. Disconnect the orange ribbon cable at the engine board. 4. Remove the 8 screw...

  • Page 255: Method #1

    Service parts disassembly 8-43 engine control interface board caution two connectors have locks to release before pulling on the harnesses. Method #1 1. After removing the engine control board, see page 8-42. 2. Disconnect the 8 wiring harnesses. 3. Loosen the 2 mounting bracket screws and remove th...

  • Page 256

    8-44 phaser 7750 printer service manual 3.3 vdc and 5 vdc low-voltage power supplies note if removing only one of the low-voltage power supplies, disconnect the associated wiring harness from the printer, and remove the 4 screws that secure the low-voltage power supply to the mounting bracket. 1. Mo...

  • Page 257: Ld Power Relay

    Service parts disassembly 8-45 ld power relay 1. Remove the rear cover and shield. 2. Disconnect the wiring harness. 3. Remove 2 screws securing the ld power assembly. 4. Remove the ld power assembly. Fig. 2 fig. 1 7750-232.

  • Page 258

    8-46 phaser 7750 printer service manual 24 vdc low-voltage power supply, fan and bracket 1. Remove the rear cover and 24 vdc shield. 2. Remove the top rear cover and left-hand rear mid covers, see page 8-7. Note if only the power supply needs to be removed, disconnect the wiring harness and loosen t...

  • Page 259

    Service parts disassembly 8-47 t2 high-voltage power supply 1. Remove the 24 vdc power supply and bracket, see page 8-46. 2. Disconnect the high-voltage wires from the kcmy connectors. 3. Disconnect the wiring harness from j575 and j576. 4. Remove the 2 screws that secure the t2 power supply to the ...

  • Page 260: Chassis Ac Power Assembly

    8-48 phaser 7750 printer service manual chassis ac power assembly note ac power (consists of the ac drive, noise filter and gfi assemblies and mounting bracket. 1. Remove the t2 high-voltage power supply. 2. Remove t1 and t3 power supply assembly. 3. Disconnect the wiring harnesses p15 and p16, the ...

  • Page 261: Main Drive Assembly

    Service parts disassembly 8-49 main drive assembly 1. Remove the fuser. 2. Remove tray 1 /(mpt), see page 8-9. 3. Remove the t2 high-voltage power supply, see page 8-47. 4. Disconnect the wiring harness. Caution there are 5 brass screws that hold the main drive assembly together. Do not remove these...

  • Page 262

    8-50 phaser 7750 printer service manual accumulator belt drive assembly 1. Remove the rear cover and shield. 2. Move the t1 and t3 power supplies out of the way. 3. Remove any components covering the motor which is mounted to the frame at the rear, top, left corner. 4. Remove the 3 screws that secur...

  • Page 263: Developer Drive Assembly

    Service parts disassembly 8-51 developer drive assembly 1. Remove the 3.3 vdc and 5 vdc power supply and bracket assembly, see page 8-44. 2. Disconnect the wiring harness from the developer drive assembly. 3. Clear the high-voltage lines. 4. Remove the 2 black screws securing the developer drive ass...

  • Page 264: Imaging Unit Drive Assembly

    8-52 phaser 7750 printer service manual imaging unit drive assembly 1. Remove the rear cover, see page 8-6. 2. Remove the right side cover, see page 8-4. 3. Remove the 3.3 vdc and 5 vdc low-voltage power supply, see page 8-44. 4. Remove the 24 vdc low-voltage power supply, see page 8-46. 5. Remove t...

  • Page 265: Tray 2 Paper-Select Switches

    Service parts disassembly 8-53 tray 2 paper-select switches 1. Remove the t1 and t3 high-voltage power supply. 2. Remove the 3.3 vdc and 5 vdc low-voltage power supplies, see page 8-44. 3. Disconnect the wiring harness from the tray 1 paper-select switches. 4. Remove the 2 screws that secure the mou...

  • Page 266: Main Lever Assembly

    8-54 phaser 7750 printer service manual main lever assembly reinstallation procedures note slide the main lever gears under the lift jack assembly racks and lift into position. Verify that the timing marks on the main lever and the lift jack assemblies align. The main lever assembly requires extra p...

  • Page 267: Reinstallation Procedures

    Service parts disassembly 8-55 right-hand lift jack assembly 1. Ensure that the lift frame assembly is fully lifted and the main lever is in the down position. 2. Remove the accumulator belt assembly. 3. Remove rh cover assembly. 4. Remove the pivot pin and partially remove the main lever on the rig...

  • Page 268

    8-56 phaser 7750 printer service manual 9. Remove the e-clips, washers, and bearings from the lh lift jack assembly roller guides. 10. Partially remove the left hand side of the main lever assembly. 11. Remove the lh lever hinge. 12. Remove the 4 screws that hold the lh lift jack bracket and remove ...

  • Page 269: Optional Lower Trays

    Service parts disassembly 8-57 optional lower trays right side door 1. Remove the 4 screws securing the right-hand cover and remove. Rear cover 1. Remove the 4 screws securing the cover. 2. Remove the rear cover. 7750-238.

  • Page 270: Ltd/hcf Cover Assembly

    8-58 phaser 7750 printer service manual ltd/hcf cover assembly 1. Open door c. 2. Remove 1 screw from each of the support straps. 3. Remove 1 screw from the cover’s front pivot bracket. 4. Remove the cover assembly from the rear pivot. 7750-164 rear cover interlock switch front pivot bracket.

  • Page 271

    Service parts disassembly 8-59 high-capacity feeder (hcf) tray 4 1. On the left side of the high-capacity feeder, remove one screw from the tray 4 stopper bracket and remove the bracket. 2. Pull tray 4 out of the printer. High-capacity feeder (hcf) tray 5 and paper transport 1. Open tray 5. 2. Remov...

  • Page 272

    8-60 phaser 7750 printer service manual ltd/hcf feeder paper-select switches 1. Remove the paper tray. 2. Reach inside the cabinet and disconnect the wire harness. 3. Reach inside the cabinet and remove the 1 screw that secures the paper-select switch. Universal tray assembly v universal tray paper ...

  • Page 273: Removal Of Motor

    Service parts disassembly 8-61 ltd/hcf feeder paper feed motor assembly 1. Remove the left-hand cover. 2. Open the tray halfway. 3. Disconnect the wiring harness. 4. Remove the 2 screws holding the tray 2 feeder assembly, not the screws securing the lower tray bracket. 5. Remove the tray feeder asse...

  • Page 274: Replacement Procedures

    8-62 phaser 7750 printer service manual bracket assembly, left-hand and right-hand gear (hcf) 1. Remove the rear cover. 2. Remove the 2 screws securing the bracket assembly (gear rh (2) or gear lh (1)) to the frame. 3. Remove the bracket assembly. Replacement procedures note there are locating pins ...

  • Page 275: In This Chapter...

    9 chapter service parts lists in this chapter... ■ serial number format ■ using the parts list ■ hardware kits ■ recommended service tools.

  • Page 276: Serial Number Format

    9-2 phaser 7750 printer service manual serial number format changes to xerox products are made to accommodate improved components as they become available. It is important when ordering parts to include the following information: ■ component’s part number ■ product type or model number ■ serial numb...

  • Page 277: Using The Parts List

    Service parts lists 9-3 using the parts list 1. No.: the callout number from the exploded part diagram. 2. Part number: the material part number used to order specific parts. 3. Qty: this number represents the parts per printer, not the number of parts supplied in the actual part order. 4. Name/desc...

  • Page 278: Parts List 1.1 Drive Unit

    9-4 phaser 7750 printer service manual parts list 1.1 drive unit s4500-345.

  • Page 279

    Service parts lists 9-5 drive unit pl 1.1 no. Part number qty part description and (part name) 1 116-1752-00 drum drive assembly (drive assy drum) 4 116-1753-00 accumulator belt drive (drive assy ibt) 7 116-1754-00 developer drive assembly (drive assy-deve) 14 116-1755-00 main drive assembly (drive ...

  • Page 280

    9-6 phaser 7750 printer service manual part list 1.2 main drive motor assembly main drive motor assembly pl 1.2 no. Part number qty part description and (part name) 13 116-1539-00 developer clutch assembly (clutch assy deve) s7750-346.

  • Page 281

    Service parts lists 9-7 part list 1.3 steering motor and mob steering motor and mark-on-belt pl 1.3 no part number qty part description and (part name) 1 116-1104-00 belt steering drive assembly (drive assy steering) 4 116-1124-00 mark on belt sensor assembly (sensor assy-mob) s7750-347.

  • Page 282: Part List 2.1 Tray 2

    9-8 phaser 7750 printer service manual part list 2.1 tray 2 tray 2 pl 2.1 no part number qty part description and (part name) 1 116-1093-00 tray stopper (stopper tray) 2 spacer n/s 3 116-1126-00 paper supply switch assembly (switch assy-p.S) 4 119-6504-00 tray 2 (universal tray) s7750-348.

  • Page 283

    Service parts lists 9-9 part list 2.3 tray feeder and left lower cover assy tray 2 feeder and left lower cover assembly pl 2.3 no part number qty part description and (part name) 1 116-1160-00 tray 2 feeder assembly (feeder assy) 2 116-1181-00 lower lh cover assembly (cover assy lh low) 16 116-1757-...

  • Page 284

    9-10 phaser 7750 printer service manual part list 2.4 tray 2 feeder tray 2 feeder pl 2.4 no part number qty part description and (part name) 1 116-1109-00 motor assembly (motor assy) 16 116-1211-00 roller kit s7750-351 16.

  • Page 285

    Service parts lists 9-11 part list 2.6 registration transport registration transport pl 2.6 no part number qty part description and (part name) 1 116-1758-00 registration transport assembly (trnsport assy- regi) s7750-353.

  • Page 286

    9-12 phaser 7750 printer service manual part list 2.7 left cover unit left cover unit pl 2.7 no part number qty part description and (part name) 1 116-1540-00 11/23t tooth damper gear (gear damper 11t/23t) 3 116-1541-00 left hand damper gear (white) (damper-lh) 5 116-1182-00 left hand cover assembly...

  • Page 287

    Service parts lists 9-13 part list 2.8 left cover assembly: 1 of 2 left cover assembly: 1 of 2 pl 2.8 no part number qty part description and (part name) 3 108r00579 2nd btr/transfer roller assembly (2ndbtr assembly) 12 116-1543-00 exit switch assembly (switch assy-exit 14 116-1098-00 duplex chute a...

  • Page 288

    9-14 phaser 7750 printer service manual part list 2.9 left cover assembly: 2of 2 left cover assembly: 2 of 2 pl 2.9 no part number qty part description and (part name) 3 116-1760-00 second motor assembly (motor assy-2nd) 6 116-1544-00 paper on belt (pob) sensor 17 114-1542-00 damper gear (45tooth) (...

  • Page 289

    Service parts lists 9-15 part list 2.10 exit transport assembly exit transport assembly pl 2.10 no part number qty part description and (part name) 1 116-1762-00 exit transport 2 116-1196-00 exit transport cover s7750-357.

  • Page 290

    9-16 phaser 7750 printer service manual part list 2.12 tray 1: 1 of 2 tray 1: 1 of 2 pl 2.12 no part number qty part description and (part name) 1 116-1763-00 tray 1/mpt (feeder assy-msi) s7750-359.

  • Page 291

    Service parts lists 9-17 part list 2.13 tray 1: 2 of 2 tray 1 pl 2.13 no part number qty part description and (part name) 5 116-1763-00 tray 1/mpt extension s7750-360

  • Page 292

    9-18 phaser 7750 printer service manual part list 2.14 tray 1 feed assembly tray 1 feed assembly pl 2.14 no part number qty part description and (part name) 14 116-1765-00 feed roller assembly (roller assy-feed) 15 116-1820-00 2 feed roller kit 19 116-1166-00 retard pad (pad assy-retard) 22 116-1766...

  • Page 293

    Service parts lists 9-19 part list 3.1 laser (ros) assembly laser ros assembly pl 3.1 no part number qty part description and (part name) 2 116-1768-00 laser assembly (ros assembly) s7750-36.

  • Page 294

    9-20 phaser 7750 printer service manual part list 4.1 xerographic module: 1 of 2 xerographic module 1 of 2 pl 4.1 no part number qty part description and (part name) 2 108-r005-75 waste toner cartridge 3 116-1138-00 sensor holder assembly (holder assy-sns) 7 108-r005-81 imaging unit 8 116-1101-00 ag...

  • Page 295

    Service parts lists 9-21 part list 4.2 xerographic module: 2 of 2 xerographic module 2 of 2 pl 4.2 no part number qty part description and (part name) 1 116-1769-00 xerographic plate assembly (plate assy-xero opb) 6 116-1770-00 image unit mounting rail y, m, c (erase asst ymc) 7 116-1771-00 image un...

  • Page 296: Part List 5.1 Lift Unit

    9-22 phaser 7750 printer service manual part list 5.1 lift unit s7750-366.

  • Page 297

    Service parts lists 9-23 lift unit pl 5.1 no part number qty part description and (part name) 1 116-1198-00 lh frame lift assembly (frame assy-lift lh) 2 116-1199-00 rh frame lift assembly (frame assy-lift rh) 3 116-1772-00 bearing 4 116-1773-00 washer 5 plate n/s 6 116-1202-00 lift arm latch assemb...

  • Page 298

    9-24 phaser 7750 printer service manual part list 5.2 accumulator belt assembly accumulator belt assembly pl 5.2 no part number qty part description and (part name) 1 116-1774-00 accumulator belt assembly (kit ibt-unit opb) 7 116-1180-00 waste toner auger assembly (auger assy) 10 108-r005-80 accumul...

  • Page 299

    Service parts lists 9-25 part list 5.6 accumulator belt elevator accumulator belt elevator pl 5.6 no part number qty part description and (part name) 4 116-1777-00 accumulator belt elevator (ibt elevator frame) includes items 1 - 4 s7750-371.

  • Page 300

    9-26 phaser 7750 printer service manual part list 6.1 developer unit: 1 of 2 s7750-372.

  • Page 301

    Service parts lists 9-27 developer unit: 1 of 2 pl 6.1 no part number qty part description and (part name) 1 116-1778-00 yellow toner dispenser (disp assy y) 2 106-r006-51 yellow toner cartridge 3 116-1779-00 magenta toner dispenser (disp assy m) 4 106-r006-50 magenta toner cartridge 5 116-1780-00 c...

  • Page 302

    9-28 phaser 7750 printer service manual part list 6.2 developer unit: 2 of 2 developer unit: 2 of 2 pl 6.2 no part number qty part description and (part name) 1 116-1783-00 developer housing (hsg assy deve) 5 116-1784-00 black developer beads (developer k) 6 116-1785-00 yellow developer beads (devel...

  • Page 303

    Service parts lists 9-29 part list 7.1 fuser assembly fuser assembly pl 7.1 no part number qty part description and (part name) 1 115-r000-25 115-r000-26 fuser assembly (110v) fuser assembly (220v) s7750-374.

  • Page 304: Part List 8.1 Air System

    9-30 phaser 7750 printer service manual part list 8.1 air system air system pl 8.1 no part number qty part description and (part name) 1 116-1788-00 laser shutter motor 4 116-1789-00 lh lower inner cover (cover-inner, l/h, low) 6 116-1176-00 fuser fan assembly (fan assy fuser) 8 116-1790-00 laser fa...

  • Page 305

    Service parts lists 9-31 11 116-1834-00 bottom fan duct (not shown) location: underneath power supplies air system pl 8.1 no part number qty part description and (part name).

  • Page 306

    9-32 phaser 7750 printer service manual part list 9.1 electrical components: 1 of 3 s7750-377.

  • Page 307

    Service parts lists 9-33 electrical components: 1 of 3 pl 9.1 no part number qty part description and (part name) 1 116-1791-00 hvps (t1) 2 116-1792-00 hvps (t3) 4 116-1793-00 116-1150-00 3.3 lvps (110v) 3.3 lvps (220v) 5 116-1151-00 116-1152-00 5v lvps (110v) 5v lvps (220v) 6 116-1829-00 interface ...

  • Page 308

    9-34 phaser 7750 printer service manual part list 9.2 electrical components: 2 of 3 electrical components: 2 of 3 pl 9.2 no part number qty part description and (part name) 1 116-1796-00 116-1797-00 ac power chassis assembly (110v) ac power chassis assembly (220v) 13 116-1801-00 outlet panel 14 116-...

  • Page 309

    Service parts lists 9-35 part list 9.3 electrical components: 3 of 3 electrical components: 3 of 3 pl 9.3 no part number qty part description and (part name) 1 116-1223-00 developer block 2 116-1312-00 wire harness 3 116-1307-00 wire harness y, m 4 116-1308-00 wire harness c, k 5 116-1913-00 2nd wir...

  • Page 310

    9-36 phaser 7750 printer service manual part list 10.1 front cover front cover pl 10.1 no part number qty part description and (part name) 3 116-1800-00 front cover assembly (cover assy front mn) 6 116-1187-00 strap 7 116-1116-00 ros window cleaning wand (cleaner assy) 9 116-1117-00 ros window clean...

  • Page 311

    Service parts lists 9-37 part list 10.2 top cover and front panel top cover and front panel pl 10.2 no part number qty part description and (part name) 1 116-1802-00 top cover assembly (top cover) 5 116-1803-00 front panel (control panel) 7 116-1805-00 front fuser cover (cover ay-f front mn) 9 116-1...

  • Page 312

    9-38 phaser 7750 printer service manual part list 10.3 rear cover rear cover pl 10.3 no part number qty part description and (part name) 1 data plate n/s 2 blind cover 3 116-1954-00 rear cover assembly (cover assy rear) 4 rear cover {p/o item 3} 5 116-1188-00 lower tray unit harness cover (cover bli...

  • Page 313

    Service parts lists 9-39 part list 11.1 inverter transport inverter transport pl 11.1 no part number qty part description and (part name) 1 116-1809-00 inverter transport assembly (transport assy-inv) s7750-383.

  • Page 314

    9-40 phaser 7750 printer service manual part list 12.1 duplex unit assembly duplex unit assembly pl 12.1 no part number qty part description and (part name) 2 116-1810-00 duplex transport assembly (transport assy dup) s7750-385.

  • Page 315: Boards

    Service parts lists 9-41 part list 13.1 image processor and engine control boards boards pl 13.1 no part number qty part description and (part name) 1 116-1812-00 chassis assembly (w/o engine board) 2 116-1811-00 engine control board (pwb mcu) 3 650-4306-00 671-5316-80 image processor board 4 156-48...

  • Page 316

    9-42 phaser 7750 printer service manual part list 16.1 lower trays 3/4/5 assembly lower trays 3/4/5 assembly pl 16.1 no part number qty part description and (part name) 2 119-6504-00 tray 3 7 116-1090-00 tray 4 8 116-1089-00 tray 5 9 116-1126-00 tray 3 paper size switch 10 116-1127-00 tray 4/5 paper...

  • Page 317

    Service parts lists 9-43 part list 16.5 lower trays paper feeder: 1 of 2 lower trays paper feeder: 1 of 2 pl 16.5 no part number qty part description and (part name) 4 116-1838-00 tray 5 transport assembly 16 116-1816-00 tray 5 feeder 19 116-1218-00 tray 5 feed out sensor 20 116-1169-00 upper chute ...

  • Page 318

    9-44 phaser 7750 printer service manual part list 16.6 lower trays paper feeder: 2 of 2 lower trays paper feeder: 2 of 2 pl 16.6 no part number qty part description and (part name) 1 116-1815-00 takeaway roller 8 116-1173-00 chute assembly 12 chute 13 116-1167-00 lower chute s7750-393.

  • Page 319

    Service parts lists 9-45 part list 16.13 left cover assembly (ltd) left cover assembly (lta) pl 16.13 no part number qty part description and (part name) 1 116-1185-00 left cover assembly s7750-400

  • Page 320

    9-46 phaser 7750 printer service manual part list 16.14 tray 4/5 lift gear assembly left cover assembly (lta) pl 16.14 no part number qty part description and (part name) 2 116-1171-00 gear assembly tray 4 3 116-1170-00 gear assembly tray 5 s7750-401.

  • Page 321

    Service parts lists 9-47 part list 16.15 electrical components and caster electrical components lta pl 16.15 no part number qty part description and (part name) 4 116-1099-00 takeaway motor 2 5 116-1814-00 takeaway motor 1 12 116-1818-00 tray module control board s7750-402.

  • Page 322

    9-48 phaser 7750 printer service manual part list 16.16 lower tray deck lower tray deck pl 16.16 no part number qty part description and (part name) 1 116-1814-00 tray 3 module motor assembly (motor assy-3tm 2 116-1813-00 ltd circuit (control) board (tray module pwb) 3 116-1206-00 caster, locking (c...

  • Page 323: Hardware Kits

    Service parts lists 9-49 hardware kits recommended service tools the following service are recommended as a start for servicing the printer. As additional tools are needed visit the following url for help: http:// cpid.Office.Xerox.Com/hardwaretools.Html. Parts part number qty name and description (...

  • Page 324

    9-50 phaser 7750 printer service manual.

  • Page 325: In This Chapter...

    10 chapter wiring diagrams in this chapter... ■ plug/jack locations table ■ plug/jack locator maps ■ wiring diagrams ■ wiring schematics.

  • Page 326: Plug/jack Locations

    10-2 phaser 7750 printer service manual plug/jack locations plug/ jack no. Map number item no. Title 2 map 12 8 hvps t1, t3, +24v lvps 15a map 16 19 i/f pwb, main motor, lvps t2 16 map 16 16 i/f pwb, main motor, lvps t2 42 map 18 10 ac drive pwb, noise filter pwb, delay pwb 43 map 18 11 ac drive pwb...

  • Page 327

    10-3 140 map 3 12 inverter transport assembly 144 map 2 2 mob sensor assembly 150 map 19 4 left lower assembly, tray 2 feeder 151 map 1 12 xerographic 152 map 1 15 xerographic 153 map 1 19 xerographic 154 map 1 17 xerographic 155 map 5 3 registration transport assembly 163 map 9 11 toner dispense mo...

  • Page 328

    10-4 phaser 7750 printer service manual 227 map 9 17 toner dispense motor, main switch 228 map 9 12 toner dispense motor, main switch 229 map 9 10 toner dispense motor, main switch 230 map 9 9 toner dispense motor, main switch 231 map 5 5 registration transport assembly 232 map 17 9 developer motor,...

  • Page 329

    10-5 498 map 15 7 mcu-mf pwb 501 map 12 19 hvps t1, t3, +24v lvps 502 map 12 6 hvps t1, t3, +24v lvps 505 map 12 7 hvps t1, t3, +24v lvps 510 map 16 23 i/f pwb, main motor, lvps t2 510b map 16 18 i/f pwb, main motor, lvps t2 511 map 16 15 i/f pwb, main motor, lvps t2 514 map 10 3 ros assembly 515 ma...

  • Page 330

    10-6 phaser 7750 printer service manual 552 map 16 26 i/f pwb, main motor, lvps t2 552 map 23 6 tt module (rear) 553 map 16 17 i/f pwb, main motor, lvps t2 553 map 23 10 tt module (rear) 554 map 23 11 tt module (rear) 555 map 23 5 tt module (rear) 557 map 23 2 tt module (rear) 561 map 23 12 tt modul...

  • Page 331

    10-7 p612 map 17 3 developer motor, tray 2 size switch j613 map 3 10 inverter transport assembly p613 map 17 5 developer motor, tray 2 size switch 614 map 1 18 xerographic 617 map 19 6 left lower assembly, tray 2 feeder 619 map 1 1 xerographic 620 map 5 6 registration transport assembly 622 map 1 22...

  • Page 332

    10-8 phaser 7750 printer service manual 819 map 20 4 tt module (tray 3,4 feeder) 820 map 22 3 tt module (tray 3,4,5 paper size switch) 821 map 20 6 tt module (tray 3,4 feeder) 822 map 21 1 tt module (tray 3,4 feeder) 823 map 21 2 tt module (tray 3,4 feeder) 824 map 22 3 tt module (tray 3,4,5 paper s...

  • Page 333

    10-9 fs90 map 18 18 ac drive pwb, noise filter pwb, delay pwb fs134 map 1 13 xerographic fs135 map 1 14 xerographic fs180 map 9 19 toner dispense motor (y,m,c,k), main switch fs181 map 9 1 toner dispense motor (y,m,c,k), main switch fs182 map 9 2 toner dispense motor (y,m,c,k), main switch fs183 map...

  • Page 334: Plug/jack Locator Maps

    10-10 phaser 7750 printer service manual plug/jack locator maps map 1 - 7750-062 p/j207 p/j130 p/j223 p/j129 p/j131 p/j132 p/j224 p/j171 p/j225 p/j233 p/j619 p/j608 p/j602 p/j631 p/j622 p/j624 p/j226 p/j614 p/j154 p/j133 p/j152 p/j135 p/j134 p/j151.

  • Page 335

    10-11 map 2 - mob sensor assembly 7750-063 p/j117 p/j144 p/j255 p/j116.

  • Page 336: Map 3- Inverter Transport

    10-12 phaser 7750 printer service manual map 3- inverter transport 7750-064 p/j102 p/j218 j633 p/j217 p/j215 p/j251 inverter transport assembly p/j216 p/j111 p626 p/j140 p633 p/j113 j612 j613 j640

  • Page 337: Map 4 - Duplex Transport

    10-13 map 4 - duplex transport p/j136 p/j538 j626 p/j539 p/j540 p/j135 duplex transport assembly 7750-065.

  • Page 338: Map 5 - Fuser

    10-14 phaser 7750 printer service manual map 5 - fuser 7750-066 p/j109 p/j240 7.2.6 fuser assembly j600 p/j155 p/j620 p/j231 registration transport assembly ros shutter motor.

  • Page 339: Map 6 - Fuser

    10-15 map 6 - fuser p/j212 p/j211 p/j264 (wht) p600 (blk) fuser rear p/j260 (blu) p/j261 (red) p/j263 p/j262 fs38 fs37 7750-067.

  • Page 340: Map 7 - Exit Transport

    10-16 phaser 7750 printer service manual map 7 - exit transport 7750-068 p/j104 p/j220 p/j611 p/j222 p/j172.

  • Page 341: Map 8 - Tray 1

    10-17 map 8 - tray 1 map 9 - toner dispense motor (ymck) switch j610 p/j265 p/j219 p/j103 7750-069 7750-070 fs180 p/j288 p/j227 fs69 fs68 fs56 fs57 p/j228 p/j163 p/j229 p/j230 p/j165 fs187 fs186 fs185 fs184 fs183 fs182 fs181.

  • Page 342: Map 11 - Accumulator Belt

    10-18 phaser 7750 printer service manual map 10 - ros (laser) assembly map 11 - accumulator belt p/j527 p/j515 p/j514 p/j529 p/j526 p/j528 p/j516 p/j517 p/j518 7750-071 7750-072 p/j605 p/j122 p/j237 p/j121 p/j119.

  • Page 343

    10-19 map 12 - hvps (t1 and t3) and +24v lvps p/j572 p/j570 p/j801 p/j502 p/j505 p/j2 p/j72 fs51 p/j214 j925 j903 p/j580 p/j668 p/j669 p/j571 p/j574 p/j501 p/j573 p/j581 hvps t3 7750-073.

  • Page 344: Map 15 - Fuser Fuse Board

    10-20 phaser 7750 printer service manual map 15 - fuser fuse board p460 mcu pwb (bottom view) p/j401 p/j402 p/j403 p/j407 p/j404 p/j405 p/j406 p/j498 p/j400 j496 j410 7750-076.

  • Page 345

    10-21 map 16 - i/f power board, main motor, lvps and t2 p/j533 p/j568 p/j550 p410 p/j639 p/j641 p/j531 p/j536 p/j534 p/j203 p/j576 p/j575 p/j530 p/j532 p/j511 p/j16 p/j553 p/j510b p/j15a p/j535 p800 p/j210 p/j510 p/j208 p/j551 p/j552 p/j569 7750-077.

  • Page 346

    10-22 phaser 7750 printer service manual map 17 - developer motor and tray 2 size switch 7750-078 p/j235 p/j234 p610 p612 p613 p640 p/j221 p/j646 p/j232 p/j115.

  • Page 347

    10-23 map 18 - ac drive, noise filter, and delay board j70 fs76 p/j593 fs90 fs77 fs61 fs62 delay pwb noise filter pwb ac drive pwb p/j46 fs40 fs39 fs41 p/j590 p/j592 fs47 fs48 fs45 p/j42 p/j43 7750-079.

  • Page 348

    10-24 phaser 7750 printer service manual map 19 - left lower assembly and tray 2 feeder p/j205 p/j108 p/j106 tray 2 feeder p/j125 p/j617 p/j623 p/j150 7750-080

  • Page 349

    10-25 map 20 - tray 3 and 4 feeders (hcf) lh cover interlock switch fs813 fs812 7750-081 tray3 : p/j827 tray4 : p/j828 tray3 : p/j815 tray4 : p/j819 tray3 : p/j814 tray4 : p/j818 tray 3,4, feeder p/j670 p/j841 p/j672 p/j821 tray 3 feeder tray 4/5 feeder.

  • Page 350

    10-26 phaser 7750 printer service manual map 21 - tray 3 feeder (hcf) p/j822 p/j823 p/j829 p/j825 tray 3 feeder 7750-082.

  • Page 351

    10-27 map 22 - trays 3, 4, and 5 paper size switches (hcf) 7750-083 tray 5 paper size switch tray 4 paper size switch tray 3 paper size switch p/j824 p/j816 p/j820

  • Page 352

    10-28 phaser 7750 printer service manual map 23 - (hcf) lower tray (rear) p/j548 p/j541 p/j549 p/j561 p/j554 p/j553 p/j674 p/j842 p/j826 p/j552 p/j555 p/j547 p/j564 p/j557 p/j546 7750-084.

  • Page 353: Wiring Diagrams

    10-29 wiring diagrams +24 vdc - 1 of 2 +24v low vol tage power suppl y lh cover interlock switch lh ont interlock switch j502 j172 orn orn orn orn orn blu a1 b1 b1 ess pwb j300 a +24 vdc (2 of x) b +24 vdc (3 of x) c +24 vdc (3 of x) see wire net +24vdc-2 1.7 1.7 1.7 j172 j171 j171 j569 j569 orn orn...

  • Page 354: +24 Vdc 2 of 2

    10-30 phaser 7750 printer service manual +24 vdc 2 of 2 deve motor 9.9 9.19 9.18 9.24a 6.10 9.17 9.29 drum motor (k) drum motor (y ,m,c) 9.2 9.1 hvps t6 2nd btr retract motor 1st btr retract motor ibt steering motor ros shutter motor agit a t or motor +24 vdc +24vdc intlk j531 j551 orn i/f pwb +24vd...

  • Page 355: Main Power

    10-31 main power 1.1b 3.4 3.4 1.1b 1.1b mcu pwb pl 13.1 dela y rela y on (l)+24vdc noise fil ter pwb pl9.2 gfi breaker pl9.2 1 1 2 dc com j404 j646 p646 j593 blu blu blk blk j50 2 1 2 1 1 2 double plug yel yel +24vdc circuit protector noise fil ter gfi j72 1 2 fs75 fs74 wht fs76 fs77 plug in ach plu...

  • Page 356: Main Power 2 Of 2

    10-32 phaser 7750 printer service manual main power 2 of 2 1.1a 10.1 tbd tbd 1.4 1.4 1.3 1.3 1.5 1.5 1.6 1.6 3.3b 3.3c 3.3b 3.3c 10.1 1.1a 1.1a power on ach (to accessor y) power on ach (to accessor y) rela y on ach (to ac drive) power on ach (to ac drive) power on ach (to +3.3v l vps 2) power on ac...

  • Page 357: Lvps Control

    10-33 lvps control 1.3 1.4 1.4 1.5 1.9 1.5 1 4 4 3 2 sleep switch signal 2.1 iot power control signal 1.2 lvps control ess pwb pl13.1 +3.3vdc p/j460 b7 dc com+3.3vdc mcu pwb pl13.1 i/f pwb pl9.1 dc com dc com p/j410 119 b1 b2 dc com b4 101 +5vdc +3.3vdc j534 yel vio yel vio yel yel +5v lvps enable (...

  • Page 358: Dc Power Generation 3.3 Vdc

    10-34 phaser 7750 printer service manual dc power generation 3.3 vdc 1 2 1.2 16.1 7.11 7.1 all all all on/ off all 1.1b 1.1b mcu +3.3v enable signal power on ach (to +3.3v l vps) power on ach (to +3.3v l vps) 1.3 dc power genera tion (3.3vdc) +3.3v low vol tage power suppl y 1 pl9.1 j15a blk wht grn...

  • Page 359: Dc Power Generation 5 Vdc

    10-35 dc power generation 5 vdc 1.2 1.2 1.1b 1.1b +5v l vps enable (l) +3.3 vdc +5v l vps enable return power on ach (to +5v l vps) power on ach (to +5v l vps) +5v low vol tage power suppl y pl9.1 +5vdc on/off control +5vdc power genera tion j511 j511 yel vio blk wht gr y 1 5 1 3 5 2 4 8 6 13 3 7 6 ...

  • Page 360: Dc Power Generation +24 Vdc

    10-36 phaser 7750 printer service manual dc power generation +24 vdc 1.2 1.4 1.4 1.1b +24v l v ps enable (h) +5vdc +5vdc (to +24v l v ps) dc com (to +24v l vps) power on ach (to +24v l v ps) 1.1b power on ach (to +24v l v ps) 1.2 all all all all all all all 1.7 all 1.8 12.1 12.1 1.7 all all yel yel ...

  • Page 361: Power Interlock Switching

    10-37 power interlock switching a1 b1 j172 j172 lh cover interlock switch pl2.10 a1 b1 rh cover interlock switch pl2.10 a1 b1 j171 j173 j173 j569 j569 j171 front cover interlock switch pl10.1 orn orn drum (m) pl4.1 58 drum (y) pl4.1 58 1 1 2 4 5 drum (c) pl4.1 5 38 drum (k) pl4.1 58 1 1.9 1 1.9 1.5 ...

  • Page 362

    10-38 phaser 7750 printer service manual tray module power interlock switching 1.5 all 1.9 1 +24vdc (to tm interlock) blu blu 1.8 tra y module power interlock switching fs812 fs813 tra y module lh cover interlock switch pl15.10/16.13 dc330 [001-304] tra y module lh cover interlock closed (h) +24vdc ...

  • Page 363: Main Motor Drive Control

    10-39 main motor drive control 4 mcu pwb pl13.1 i/f pwb pl9.1 p/j410 j534 109 b11 b10 b9 b7 b15 b14 b13 b12 108 107 105 dc com dc com dc com dc com blu blu blu blu orn orn vio vio +24vdc intlk dc com 4 2 2 2 2 main motor on (l) +5vdc main motor high speed 1 (l) +5vdc main motor high speed 2 (l) +5vd...

  • Page 364

    10-40 phaser 7750 printer service manual laser control y (as an example) video data y7 video data y6 video data y5 video data y4 video data y3 video data y2 video data y1 video data y0 valid y video clock page request y line request y 1 2 3 6.12c 6.9 3 6.12c ess pwb pl13.1 mcu pwb pl13.1 6.5a laser ...

  • Page 365: Laser Scan Drive Control

    10-41 laser scan drive control 6.9 laseer scan drive controller mcu pwb pl13.1 dc com dc com dc com +24vdc j402 dc 330 [006-031] ros motor on (l) +6vdc dc 330 [006-031] ros motor ref clock yel yel yel td 1 td 1 1 2 orn vio +24vdc dc com ros assy pl3.1 1 ros motor mot fg j518 dc330 [006-160] ros moto...

  • Page 366: Laser Shutter Control

    10-42 phaser 7750 printer service manual laser shutter control mcu pwb pl13.1 i/f pwb pl9.1 p/j410 +5vdc +5vdc dc com dc com dc com dc com dc com dc com dc com dc com dc com dc com 1 13 12 11 10 +24vdc interlock yel yel yel yel yel j533 j240 p240 b1 b2 b3 b4 b5 dc330-[009-040] close dc330 [009-041] ...

  • Page 367: Color Registration Control

    10-43 color registration control 9 5 8 2 1 10 side-a led pd side-b led pd mob sensor 2 pl1.3 9 5 8 2 1 10 side-a led pd side-b led pd mob sensor 1 pl1.3 2 1 2 2 1 1 6.12c 6.12c 6.11 color registration control mcu pwb pl13.1 a2 19 12 11 20 2 9 10 1 a9 a10 a12 a19 a20 a11 9 2 1 10 12 19 20 11 a1 dc co...

  • Page 368: Tray 2 Paper Size Sensing

    10-44 phaser 7750 printer service manual tray 2 paper size sensing 1 2 i/f pwb pl9.1 +3.3vdc +3.3vdc dc com dc com b10 b8 j536 j115 yel yel 1 3 2 tra y 2 p aper size sensor pl2.1 s4 s3 s2 s1 j115 tra y 2 p aper size semsor sensed signal yel j536 b9 58 p/j410 i/f pwb pl9.1 mcu pwb pl13.1 +3.3vdc p a ...

  • Page 369: Tray 3 Paper Size Sensing

    10-45 tray 3 paper size sensing 2 1 3 2 tra y 3 p aper size sensor pl15.1/16.1 s4 s3 s2 s1 p aper size sensor s4 s3 s2 s1 7.10a 1 paper size is sensed according to voltage corresponding to combined resistance of paper size sensor . The table shows paper sizes correspond to their respective switch on...

  • Page 370: Tray 4 Paper Size Sensing

    10-46 phaser 7750 printer service manual tray 4 paper size sensing 1 3 2 tra y 4 p aper size sensor pl16.1 s4 s3 s2 s1 +5vdc dc com tra y module pwb pl16.15 12 10 vio gr y j548 +5vdc dc com j820 7.3 tra y 4 p aper size sensing tra y 4 p aper size sensor sensed signal j820 j548 yel 11 +5vdc tra y mod...

  • Page 371: Tray 5 Paper Size Sensing

    10-47 tray 5 paper size sensing 1 3 2 tra y 5 p aper size sensor pl16.1 s4 s3 s2 s1 +5vdc dc com tra y module pwb pl16.15 6 4 vio gr y j548 +5vdc dc com j824 7.4 tra y 5 p aper size sensing tra y 5 p aper size sensor sensed signal j824 j548 yel 5 +5vdc tra y module pwb pl16.15 p aper size sensor s4 ...

  • Page 372

    10-48 phaser 7750 printer service manual paper size sensing switch table paper size is sensed according to voltage corresponding to combined resistance of the paper size sensor. The table shows paper sizes repective to their on/off patterns and voltages. Paper size s1 dc330 [007-104] s2 dc330 [007-1...

  • Page 373: Tray 2 Paper Stacking

    10-49 tray 2 paper stacking 3 1 2 tra y 2 level sensor pl2.4 3 1 2 tra y 2 level sensor pl2.4 7.5 tra y 2 p aper st acking mcu pwb pl13.1 i/f pwb pl9.1 p/j410 dc com dc com dc com dc com dc com dc com dc com dc com 95 96 97 98 a6 a5 a4 a3 a2 a1 +24vdc +24vdc +24vdc blu blu blu blu blu blu blu blu bl...

  • Page 374: Tray 3 Paper Stacking

    10-50 phaser 7750 printer service manual tray 3 paper stacking 3 1 2 tra y 3 level sensor pl15.3/16.7 3 1 2 tra y 3 no p aper sensor pl15.3/16.7 7.6 tra y 3 p aper st acking tra y module pwb pl15.9/16.15 dc com dc com dc com dc com 6 5 4 3 2 1 +24vdc tm intlk +24vdc tm intlk +24vdc tm intlk yel yel ...

  • Page 375: Tray 4 Paper Stacking

    10-51 tray 4 paper stacking 3 1 2 tra y 4 level sensor pl15.5/16.9 tra y 4 no p aper sensor pl15.5/16.9 3 1 2 7.7 tra y 4 p aper st acking tra y module pwb pl15.9/16.15 dc com dc com dc com dc com b6 b5 b4 b3 b2 b1 +24vdc tm intlk +24vdc tm intlk +24vdc tm intlk yel yel yel blu yel blu vio vio blu b...

  • Page 376: Tray 5 Paper Stacking

    10-52 phaser 7750 printer service manual tray 5 paper stacking opera tor loaded paper 3 1 2 tra y 5 level sensor pl15.7/16.11 tra y 5 no p aper sensor pl15.7/16.11 3 1 2 7.8 tra y 5 p aper st acking tra y module pwb pl15.9/16.15 dc com dc com dc com dc com a6 a5 a4 a3 a2 a1 +24vdc tm intlk +24vdc tm...

  • Page 377: Tray 1/mpt Paper Stacking

    10-53 tray 1/mpt paper stacking dc com dc com dc com +3.3vdc +3.3vdc +5vdc +5vdc j532 p610 j610 j103 j265 p265 p265 j265 j610 p610 j532 dc140 [007-100] msi p aper size sensor sensed signal dc330 [007-125] msi no p aper sensor sensed (h) +3.3vdc b3 b15 b8 b10 i/f pwb pl9.1 yel double plug double plug...

  • Page 378: Paper Feeding

    10-54 phaser 7750 printer service manual paper feeding 45 54 12 21 4.1b 7.9 7.5 7.5 7.6 7.6 7.7 7.7 7.8 7.8 8.1 tray 1- 5 paper feeding mcu pwb pl13.1 control logic dc com i/f pwb pl9.1 p/j410 36 b7 b6 +24vdc +24vdc j532 dc300 [007-003] tray 5 feed solenoid on (l) +24vdc p610 yel yel double plug dou...

  • Page 379: Paper Transportation

    10-55 paper transportation 3 1 2 tra y 1 feed out sensor pl2.3 a 3 1 2 lh lower cover interlock sensor pl2.3 a a 4.1b 8.1 8.3 8.6 8.5 8.6 i/f pwb pl9.1 dc com dc com +5vdc +5vdc j536 p623 yel yel b5 b7 8.2 iot p aper transpor ta tion double plug double plug double plug j623 vio j150 gr y j150 j623 p...

  • Page 380

    10-56 phaser 7750 printer service manual tray module paper transportation 22 22 22 j546 dc com p840 double plug j840 j830 vio v io +5vdc gr y g r y 3 3 1 1 j548 dc com p841 double plug j841 j821 vio v io +5vdc gr y g r y 3 3 1 1 dc com p842 double plug j842 j825 gr y g r y +5vdc vio v io 1 1 3 3 10 ...

  • Page 381

    10-57 tray module paper transport drive control 8.4 tra y module p aper transpor t drive control tra y module pwb pl16.15 cd com cd com cd com cd com cd com cd com cd com cd com +24vdc tm intlk +24vdc tm intlk j552 take a w ay motor 1 on 24v clock 1 take a w ay motor 1 on 24v clock 1 take a w ay mot...

  • Page 382: Registration

    10-58 phaser 7750 printer service manual registration 1 3 2 ohp sensor r pl2.6 b 1 3 2 regi sensor pl2.6 a 1 2 2 8.6 8.6 9.24b 4.1b 10.5 8.1 8.2 8.5 registra tion mcu pwb pl13.1 dc com dc com +5vdc +5vdc +5vdc dc com dc com +5vdc b9 b11 b1 b3 j407 p620 yel yel yel 3 1 11 9 11 1 3 vio vio gr y gr y j...

  • Page 383: Drum Drive Control

    10-59 drum drive control mot fg 3 1 2 2 2 dc com dc com dc com mcu pwb pl13.1 i/f pwb pl9.1 p/j410 22 b5 b3 b2 b6 b7 b9 b8 20 19 +5vdc +5vdc dc com +24vdc intlk dc com dc330 [004-003] drum motor (y ,m,c) on (l) +5vdc dc330 [004-101] drum motor (y ,m,c) fail (h) +3.3vdc drum motor (y ,m,c) pl1.1 dc33...

  • Page 384: Drum Drive Control K

    10-60 phaser 7750 printer service manual drum drive control k mcu pwb pl13.1 i/f pwb pl9.1 p/j410 a11 a10 a9 a8 a12 a13 a15 a14 +5vdc dc com dc com dc com dc com dc com +24vdc intlk dc com 1 2 2 2 2 3 td 1 td 1 mot fg a7 i/f pwb pl9.1 mcu pwb pl13.1 +3.3vdc 47 p/j410 4 drum motor (k) fa il signal 9....

  • Page 385: Drum Life Control

    10-61 drum life control drum (k) pl4.1 crum 4 3 2 2 1 3 drum (c) pl4.1 crum 4 3 2 2 1 mcu pwb pl13.1 +3.3vdc +3.3vdc +3.3vdc dc com dc com dc com dc com dc com dc com a8 a7 a6 a5 a4 a3 a2 a1 yel yel yel yel yel yel yel yel yel yel yel vio yel yel yel vio j405 p622 dc330[009-035] drum (k) power on (h...

  • Page 386

    10-62 phaser 7750 printer service manual charge and exposure (y as an example) 9.1 9.26 6.5b 6.5b 6.5b 9.26 9.10 9.10 9.10 drum (y) drive cleaned drum (y) laser scanned image (y) laser scanned adc p a tch (y) laser scanned regicon p a tch (y) i/f pwb pl9.1 dc com +24vdc intlk 4 3 2 1 j553 dc com dc ...

  • Page 387: Deve Drive Control

    10-63 deve drive control 1 1 2 3 2 2 9.9 deve drive control mcu pwb pl13.1 dc com dc com i/f pwb pl9.1 p/j410 48 49 a6 a5 a3 a4 a2 a1 =5vdc =5vdc dc com dc com dc com dc com +24vdc intlk +24vdc intlk blu blu orn vio vio gr y j534 j232 dc 330 [009-014] (5s) deve motor on (l) +5vdc dc 330 [009-014] (5...

  • Page 388

    10-64 phaser 7750 printer service manual development y (as an example) 9.15 9.9 dispensed yellow toner 9.5 la tent image (y) 9.5 la tent adc p a tch (y) 9.5 la tent regicon p a tch (y) 1 3 3 3 3 3 2 deve bias (y , m) power control caution high vol tage 5 6 1 2 3 4 5 6 9.20 9.20 9.20 9.29 9.31 9.10 d...

  • Page 389: Development K

    10-65 development k 9.15 4.1b dispensed black toner 9.8 la tent image (k) 9.8 la tent adc p a tch (k) 9.8 la tent regicon p a tch (k) 1 3 3 3 3 3 2 deve bias (c, k) power control caution high vol tage 5 6 1 2 3 4 5 6 9.13a development (k) (1 of 2) deve (k) drive hvps control pwb pl9.1 i/f pwb pl9.1 ...

  • Page 390: Development K (Cont’D)

    10-66 phaser 7750 printer service manual development k (cont’d) a b c d e f 9.23 9.23 9.23 9.29 mcu pwb pl9.1 i/f pwb pl9.1 dc com p/j410p/j410 p/j410 38 b12 b11 +24vdc +24vdc dc330 [009-013] (5s) deve (k) clutch on (l) +24vdc j532 j234 yel yel 1 2 2 1 p234 deve (k) clutch pl1.2 double plug deve bia...

  • Page 391

    10-67 new toner cartridge detection new car tridge detect switch (m) pl6.1 1 fs182 fs183 yel yel new car tridge detect switch (y) pl6.1 1 fs180 fs181 yel yel yel yel j163 p163 j163 double plug 2 4 3 1 double plug 4 2 1 3 double plug 4 2 1 3 new car tridge detect switch (k) pl6.1 1 1 2 fs186 fs187 bl...

  • Page 392: Toner Dispense Control

    10-68 phaser 7750 printer service manual toner dispense control +5vdc +5vdc +5vdc +5vdc dc com dc com dc com dc com +24vdc intlk +24vdc intlk +24vdc intlk +24vdc intlk +24vdc intlk +24vdc intlk p/j410 17 77 76 75 mcu pwb pl13.1 i/f pwb pl9.1 a1 a2 a3 a4 a5 a6 a7 a8 j533 j277 j228 j229 blu blu blu bl...

  • Page 393: Adc and Environment Sensing

    10-69 adc and environment sensing 9.20 9.21 9.22 9.23 9.31e 9.31d 9.31e 9.16 adc and enviroment sensing mcu pwb pl13.1 i/f pwb pl9.1 p/j410 114 113 115 116 +5vdc +5vdc +5vdc +24vdc +24vdc +5vdc dc com dc com dc com dc com dc com a10 a11 a13 a9 a8 a7 a6 dc 300 [009-076] adc sensor led 2 on (l) +5vdc ...

  • Page 394

    10-70 phaser 7750 printer service manual accumulator belt assembly drive control mcu pwb pl13.1 dc com dc com dc com dc com dc com dc com dc com 1 2 2 2 2 4 3 2 p/j410 i/f pwb pl9.1 +24vdc intlk +24vdc intlk 1 2 3 4 5 dc330 [004-002] ibt motor on +24vdc clock dc330 [004-002] ibt motor on +24vdc cloc...

  • Page 395

    10-71 1st btr contact retract control on fwd clk 9.18 1st btr cont act retract control mcu pwb pl13.1 i/f pwb pl9.1 +5vdc +5vdc +5vdc +5vdc p/j410 dc com dc com dc com dc com dc com dc com dc com dc com +24vdc intlk +24vdc intlk a20 a19 a18 a17 a16 a15 a9 a7 b6 b5 b4 b3 b2 b1 a1 a2 a3 a4 a5 a6 b7 74...

  • Page 396

    10-72 phaser 7750 printer service manual accumulator belt assembly positioning ibt home sensor pl5.4 1 3 2 3 1 2 b a 9.31a 9.31a 9.19 ibt positioning mcu pwb pl13.1 i/f pwb pl9.1 p/j410 dc com dc com dc com dc com 90 89 30 29 +24 vdc intlk +24 vdc intlk dc com dc com dc com dc com 1 2 3 4 5 j550 blu...

  • Page 397

    10-73 image transfer to accumulator belt y (as an example) 9.10 9.10 9.10 9.28 9.26 6.11 9.16 9.21 transferred image (y) to ibt transferred adc p a tch (y) to ibt transferred regicon p a tch (y) to ibt cont amina ted drum (y) 1 2 p/j571 9.20 image transfer to ibt (y) cleaned ibt developed image (y) ...

  • Page 398: Image Transfer to Paper

    10-74 phaser 7750 printer service manual image transfer to paper 65 b6 15 1 1 6 dc com dc com 64 b7 14 2 2 5 b8 13 3 3 4 b9 12 4 4 3 b10 11 5 5 2 b11 10 6 6 1 dc com 66 dc com dc com dc com dc com +24vdc intlk +24vdc intlk +24vdc intlk a 9.24a image transfer to p aper (1 of 2) mcu pwb pl13.1 i/f pwb...

  • Page 399

    10-75 image transfer to paper (cont’d) 9.25 9.28 2 3 9.23 4.1 8.7 registra ted p aper transferred image (y+m+c+k) to obt 2nd btr drive mcu pwb pl13.1 dc com j406 b7 i/f pwb pl9.1 j553 dc com +24vdc intlk +24vdc intlk +24vdc intlk 4 3 2 1 2nd btr select transfer (l) +5vdc clean (h) +5vdc blu 1 dc com...

  • Page 400: Stripping

    10-76 phaser 7750 printer service manual stripping 1 a 10.2 9.31a 2 unfused copy 9.24b i/f pwb pl9.1 i/f pwb pl9.1 dc com +24vdc intlk +24vdc intlk +24vdc intlk +24vdc intlk j553 j533 b17 b15 +5vdc dc com 4 3 2 1 dc com dc com dc com vio vio orn orn j501 p/j570 15,16,17 18 9 10 11 12 13 analog gnd +...

  • Page 401

    10-77 drum cleaning (y, m as an example) 9.26 drum cleaning (y ,m) mcu pwb pl13.1 dc com +24vdc +24vdc b2 b1 mcu pwb pl13.1 dc com +24vdc b4 b3 j403 dc330 [009-045] erase lamp (y) on (l) +24vdc j223 yel yel double plug p223 1 1 2 2 erase lamp (y) pl4.2 +24vdc j403 dc330 [009-045] erase lamp (m) on (...

  • Page 402: Waste Toner Disposal

    10-78 phaser 7750 printer service manual waste toner disposal 9.28 9.10 9.26 9.26 9.11 9.12 9.13 9.27 9.27 w aste toner from ibt w aste trickle (y) w aste trickle (m) w aste trickle (c) w aste trickle (k) w aste toner (y) w aste toner (m) w aste toner (c) w aste toner (k) 9.29 w aste toner disposal ...

  • Page 403: Rear Fan Control

    10-79 rear fan control 1 mot mcu pwb pl13.1 i/f pwb pl9.1 p/j410 62 2 1 4 +24vdc dc com dc com j552 dc330 [004-050] rear f an high speed (l) +24vdc brn red blk rear f a n pl8.1 fa n dc330 [004-200] rear f a n locked (h) +3.3vdc yel j552 exhaust air 3 i/f pwb pl9.1 p/j410 63 +3.3vdc mcu pwb pl13.1 9....

  • Page 404: Fusing

    10-80 phaser 7750 printer service manual fusing 4.1b 10.1 9.25 mot 1 1 2 a 2 10.6 10.3b 10.2 fusing mcu pwb pl13.1 dc com dc com dc com +24vdc +24vdc a15 a14 a17 j407 dc330 [004-050] fuser f an high speed (l) +24vdc j222 blu blu blu double plug double plug 32 1 4 4 1 p222 p222 j222 fuser f a n pl8.1...

  • Page 405: Inverter

    10-81 inverter a b 10.3a inver ter (1 of 2) mcu pwb pl13.1 dc com dc com +24vdc +24vdc +24vdc +24vdc a8 a9 a10 a11 j407 dc330 [008-042] (400ms) inver ter forw ard clutch on (l) +24vdc dc330 [008-042] (400ms) inver ter reverse clutch on (l) +24vdc blu blu blu blu blu orn blu orn blu orn blu orn doubl...

  • Page 406: Inverter (Cont’D)

    10-82 phaser 7750 printer service manual inverter (cont’d) 1 2 3 3 3 2 1 12 1 2 double plug double plug 12 1 2 double plug b a 10.4a 10.4a 10.4a 10.2 11 3 1 13 double plug 33 5 1 double plug a5 b5 b7 a7 dra wer connector dra wer connector c 3 1 2 fa ce up exit sensor pl11.2 c 3 1 2 full p aper st ac...

  • Page 407: Duplex Drive Control

    10-83 duplex drive control dc com dc com dc com a10 a11 a12 double plug 5 4 3 7 8 9 dra wer connector b5 b4 b3 a5 a4 a3 yel yel yel yel yel yel j640 p626 j626 j538 dc com dc com dc com dc com +24vdc 10.5 1 1 1 td 1 1 td 1 mcu pwb pl13.1 j406 dc330 [008-009-012] duplex motor on (l) +5vdc dc330 [008-0...

  • Page 408: Duplex Drive

    10-84 phaser 7750 printer service manual duplex drive 10.3b 10.4 a b 3 1 2 duplex w a iy sensor pl12.2 dra wer connector a7 a6 b7 b6 double plug 5 6 7 6 10.6 8.7 10.6 10.5 duplex drive inver ted copy duplex drive duplex pwb pl12.2 dc com dc com +5vdc j540 j135 j135 dc com dc com vio vio gr y +5vdc j...

  • Page 409

    10-84 phaser 7750 printer service manual duplex drive 10.3b 10.4 a b 3 1 2 duplex w aiy sensor pl12.2 dra wer connector a7 a6 b7 b6 double plug 5 6 7 6 10.6 8.7 10.6 10.5 duplex drive inver ted copy duplex drive duplex pwb pl12.2 dc com dc com +5vdc j540 j135 j135 dc com dc com vio vio gr y +5vdc j1...

  • Page 410: 0 W

    Ph aser 775 0 pri nt er 10- 85 ph as er 7 75 0 w ir ing sc he ma ti c 1 of 6.

  • Page 411: 0 W

    10 -86 phase r 77 50 pr int er ph as er 7 75 0 w ir ing sc he ma ti c 2 of 6.

  • Page 412: 0 W

    Ph aser 775 0 pri nt er 10- 87 ph as er 7 75 0 w ir ing sc he ma ti c 3 of 6.

  • Page 413: 0 W

    10 -88 phase r 77 50 pr int er ph as er 7 75 0 w ir ing sc he ma ti c 4 of 6.

  • Page 414: 0 W

    Ph aser 775 0 pri nt er 10- 89 ph as er 7 75 0 w ir ing sc he ma ti c 5 of 6.

  • Page 415: 0 W

    10 -90 phase r 77 50 pr int er ph as er 7 75 0 w ir ing sc he ma ti c 6 of 6.

  • Page 416

    10 -92 phase r 77 50 pr int er.

  • Page 417: In This Chapter...

    11 chapter phaser 7750 finisher in this chapter... ■ phaser 7750 finisher ■ finisher specifications ■ finisher assemblies ■ finisher disassembly ■ finisher service parts list.

  • Page 418: Phaser 7750 Finisher

    11-2 phaser 7750 printer service manual phaser 7750 finisher finisher overview ■ the finisher is a customer installed option that contains a horizontal transport, stapler, compiler, and stacker. ■ the finisher docks with the print engine and finisher stand. ■ the finisher’s built in power supply tak...

  • Page 419: Finisher Specifications

    11-3 finisher specifications category specification configuration user installed option. The finisher provides stapling (up to 50 sheets), print job offset and stacking up to 1,000 sheets of paper. The finisher docks with the printer and stand. All finisher operations are controlled by the finisher ...

  • Page 420

    11-4 phaser 7750 printer service manual stacker capacity 1000 non-stapled sheets (20 lb. Paper, letter/a4 or smaller) 500 unstapled sheets (20 lb. Paper, over size letter/a4) 300 unstapled sheets (mix stack / loading large on small) 50 stapled sets staple cartridge capacity 5000 staples category spe...

  • Page 421: Finisher Assemblies

    11-5 finisher assemblies s7700-445 gate unit horizontal transport staple finisher stacker stand.

  • Page 422

    11-6 phaser 7750 printer service manual internal assemblies of the finisher exit assembly main motor finisher control board decurler compiler tray stacker motor assembly staple assembly track cam bracket assembly staple unit s7700-372.

  • Page 423: Locations

    11-7 horizontal transport sensor, interlock and switch locations iot face down tray full sensor h-transport entrance sensor gate in solenoid h-transport interlock sensor h-transport exit sensor s7700-447.

  • Page 424

    11-8 phaser 7750 printer service manual finisher sensor, interlock and switch locator map s7700-449 rear eject clamp home sensor stack height sensor decurler cam home sensor docking interlock sensor set clamp home sensor full stack sensor.

  • Page 425

    11-9 finisher sensor, interlock and switch locator map.

  • Page 426: Finisher Disassembly

    11-10 phaser 7750 printer service manual finisher disassembly this section details the removal and replacement procedures for the main assemblies of the phaser 7750 light finisher. When replacing sensors, actuators, interlocks and/or switches; ■ refer to the appropriate locator map to identify the s...

  • Page 427

    11-11 horizontal transport assembly 1. Unplug the finisher from the printer. 2. Lift the two hooks securing the horizontal transport assembly to the finisher. 3. Remove the horizontal transport assembly..

  • Page 428

    11-12 phaser 7750 printer service manual horizontal transport top open, front, and rear cover 1. Remove the horizontal transport assembly, see page 11-11. 2. Remove 1 screw securing the stopper. 3. Remove 2 screws from the horizontal transport front cover and remove the cover. 4. Remove the hinge sc...

  • Page 429

    11-13 horizontal transport entrance upper cover assembly 1. Remove the horizontal transport assembly, see page 11-11. 2. Remove the front cover, see page 11-12. 3. Remove 2 screws securing the rear cover and remove. 4. Remove the gate-in solenoid assembly. 5. Remove 4 screws securing the entrance up...

  • Page 430: Horizontal Transport Belts

    11-14 phaser 7750 printer service manual horizontal transport belts 1. Remove the horizontal transport covers, see page 11-12. 2. Remove the kl-clips from the horizontal transport in and out. 3. Remove the bearings from the horizontal transport in and out shafts. 4. Remove one end of each horizontal...

  • Page 431: Sensor

    11-15 horizontal transport entrance sensor and top tray full sensor 1. Remove the horizontal transport top open and front cover, see page 11-12. 2. Remove the 2 screws securing the horizontal transport entrance upper cover, see page 11-13 3. Remove the entrance sensor cover, pry up on the locking ta...

  • Page 432: Gate-In Solenoid Assembly

    11-16 phaser 7750 printer service manual gate-in solenoid assembly 1. Remove the rear cover. 2. Disconnect the ground wire from the solenoid housing. 3. Remove the 2 screws securing the gate-in solenoid assembly and remove..

  • Page 433: Finisher Covers

    11-17 finisher covers 1. Remove the horizontal transport assembly, see page 11-11. 2. Remove 1 screw from the left panel and remove. 3. Remove 5 screws from the rear cover. 4. Clear the gear at the top of the rear cover and remove the cover. S7700-396 front cover left panel left top cover rear cover...

  • Page 434

    11-18 phaser 7750 printer service manual 5. Open the front door. 6. Remove 4 screws securing the front cover and remove. 7. Remove 2 screws from the left cover and lift up and out to remove. 8. Loosen the 4 screws securing the top cover. 9. Remove the left portion of the top cover assembly. 10. Open...

  • Page 435: Stack Height-Sensor Assembly

    11-19 stack height-sensor assembly 1. Remove the horizontal transport assembly, see page 11-11. 2. Remove the top cover, see page 11-17. 3. Remove 1 screw from the stack height sensor bracket. 4. Press down on the two locking tabs located at the top of the sensor, press up on the two locking tabs at...

  • Page 436

    11-20 phaser 7750 printer service manual stacker paper-sensor assembly 1. Loosen the thumb screw and remove the stacker tray. 2. Remove the 4 screws securing the stacker paper sensor assembly to the finisher. 3. Remove 2 screws from the bottom of the assembly. 4. Remove 1 screw on the sensor bracket...

  • Page 437

    11-21 set clamp clutch and gear 1. Remove the rear cover, see page 11-17. 2. Remove the set clamp actuator. 3. Remove 1 screw from the set clamp actuator retainer and remove. 4. Remove the clutch collar and clutch. 5. Remove the gear. Note when replacing, after installing the clutch collar you need ...

  • Page 438: Eject Roll Assembly

    11-22 phaser 7750 printer service manual eject roll assembly 1. Remove the rear and left covers, see page 11-17. 2. Remove sack paper sensor assembly, see page 11-20. 3. Undo the intermediate connector. 4. Remove the right cover. 5. Remove the set camp clutch and gear, see page 11-21. 6. Remove both...

  • Page 439

    11-23 finisher control board, bracket and shield 1. Remove the rear cover, see page 11-17. 2. Remove 8 screws and loosen the two bottom screws. 3. Remove finisher control board shield. 4. Undo all the connectors. 5. Remove 2 screws on the left. 6. Loosen 1 screw on the right. 7. Undo one connector. ...

  • Page 440

    11-24 phaser 7750 printer service manual 10. Remove the finisher control board cover. 11. Remove the 4 wiring connectors. 12. Remove 6 screws from the control board remove. Note when reinstalling the cover, do not insert screws into the second or fourth holes at the bottom of the cover as these are ...

  • Page 441: Stacker Motor Assembly

    11-25 stacker motor assembly 1. Remove the finisher control board bracket, and shield, see page 11-23. 2. Remove 1 connector. 3. Remove 3 screws securing the stacker motor assembly and remove. Note when reinstalling, ensure the gear is engaged and the sensor for the stacker is tripped..

  • Page 442: Paddle Shaft

    11-26 phaser 7750 printer service manual paddle shaft 1. Remove the rear, left and right covers, see page 11-17. 2. Remove the cam bracket assembly, see page 11-28. 3. Remove the staple unit, see page 11-29. 4. Remove the e-clips from both ends of the shaft. 5. Remove the gear and bushing from the f...

  • Page 443

    11-27 paper transport motor (motor assembly main) 1. Remove the rear cover, see page 11-17. 2. Remove 4 screws. 3. Undo the connector and lift the motor up and then out to free the belt..

  • Page 444: Cam Bracket Assembly

    11-28 phaser 7750 printer service manual cam bracket assembly 1. Remove the rear and top covers, see page 11-17. 2. Remove 1 screw securing the decurler cam sensor. 3. Remove 1 screw from the eject clamp home sensor. 4. Disconnect the wiring harness from the set clamp home sensor. 5. Remove the wiri...

  • Page 445: Staple Unit Assembly

    11-29 staple unit assembly and motor staple unit assembly 1. Remove the front cover, see page 11-17. 2. Remove the 2 connectors to the staple unit. 3. Remove 2 screws, note: one screw has a ground wire. 4. Pull the staple unit assembly down, tilt up and pull out towards the front. Staple motor 1. Re...

  • Page 446: Compiler Tray

    11-30 phaser 7750 printer service manual compiler tray 1. Remove all covers, see page 11-17. 2. Remove the finisher control board shield, see page 11-23. 3. Disconnect p848. 4. Remove the set clamp solenoid connector. 5. Remove the staple unit, see page 11-29. 6. Remove 2 screws from the bottom of t...

  • Page 447: Finisher Wiring Diagrams

    11-31 finisher wiring diagrams dc power and interlock switches i/f pwb pl9.1 +24vdc (1.5) dc com (1.5) j530 p800 orn vio 11 8 1 2 ch12 all a a top cover interlock switch pl17.13 2b 1a 1b 2a 3 4 12 front door interlock switch pl17.13 2b 1a 1b 2a 3 4 1 2 j890 12.11a 12.11a 12.11a 1 1 1 k1 ch12 all 3 1...

  • Page 448: Board Communication

    11-32 phaser 7750 printer service manual board communication double plug double plug double plug 3 4 5 5 3 1 5 3 1 72 4 5 6 j800b p800b j843 12.2 pwbs communica tion mcu pwb 13.1 b13 b12 b11 b9 b16 b16 b20 dc com yel yel yel yel yel yel yel j403 mcu to finisher communica tion line return dc330 [12-1...

  • Page 449: Copy And Drive Delivery

    11-33 copy and drive delivery 1 finisher pwb pl17.13 intlk on +24vdc rt 5 dc com dc com 10.3 on 12.11a 12.4 12.5 12.5 12.6 12.4 2 b1 b2 j845 dc330 [12-060] p aper to finisher on (h) +24vdc dc330 [12-060] p aper to top tra y on (h) +24vdc j861 1 2 orn blu j860 double plug p860 2 11 2 ga te in solenoi...

  • Page 450: Horizontal Transportation

    11-34 phaser 7750 printer service manual horizontal transportation double plug 3 1 2 h-tra interlock sensor pl17.4 3 1 2 h-tra exit sensor pl17.4 3 1 2 h-tra entrance sensor pl17.4 double plug j856 j858b 12.11a 12.11a 12.11a 12.5 1 1 1 12.3 12.3 12.4 horizont al transpor ta tion finisher pwb pl17.13...

  • Page 451

    11-35 decurler and paper transportation 2 2 3 3 1 2 decurler cam home sensor pl17.8 12.11a 12.6 12.11a 12.3 12.3 12.4 3 1 2 compiler entrance sensor pl17.12 4 1 3 4 2 4 12.5 decurler and p aper transpor ta tion finisher pwb pl17.13 +5vdc dc con dc con j849 gr y vio j846 rt 5 intlk on +5vdc 3 1 2 1 d...

  • Page 452: Tamping and Offset

    11-36 phaser 7750 printer service manual tamping and offset 3 1 2 3 4 2 2 2 2 12.8 12.11a 12.11a 12.11b 3 1 2 rear t amper home sensor pl17.10 3 1 2 rear t amper home sensor pl17.10 3 1 2 front t amper home sensor pl17.10 finisher pwb pl17.13 12.5 12.3 1 1 1 1 3 12.6 t amping and offset finisher pwb...

  • Page 453: Staple Positioning

    11-37 staple positioning 1 3 2 st aple move sensor pl17.9 1 3 2 st aple front corner sensor pl17.9 st aple move motor pl17.9 12.7 st aple positioning finisher pwb pl17.13 +5vdc +5vdc dc com dc com j852 j885 gr y gr y vio vio j850 8 6 a3 a1 5 1 2 6 3 4 intlk on +24vdc rt 2 2 1 1 1 3 3 2 2 2 t 9 j865 ...

  • Page 454: Staple Control

    11-38 phaser 7750 printer service manual staple control 12.6 st aple head home sensor dc com +5vdc st aple ready sensor dc com +5vdc low st aple sensor dc com +5vdc 2 3 4 12.11b 12.11b 12.11b 12.9 12.8 st aple control finisher pwb pl17.13 intlk on +24vdc rt 2 t 9 2 7 8 9 10 1 5 dc com dc com dc com ...

  • Page 455: Set Eject

    11-39 set eject 3 1 1 1 1 2 1 2 3 4 4 4 3 12.8 12.11b 12.10a 12.11b set clamp home sensor pl17.8 3 1 2 eject clamp home sensor pl17.8 3 1 2 12.9 set eject finisher pwb pl17.13 rt 3 4 8 10 14 6 12 t9 intlk on +24vdc intlk on +24vdc intlk on +24vdc intlk on +24vdc intlk on +24vdc j846 blu blu blu blu ...

  • Page 456: Stacker Tray Control

    11-40 phaser 7750 printer service manual stacker tray control up down st ack height sensor pl17.6 3 1 2 st ack height sensor pl17.6 3 1 2 double plug 25 double plug 22 3 3 2 12.11b 12.11b double plug double plug 43 1 6 13 1 3 double plug 13 1 3 12.9 12.10a st acker tra y control (1 of 2) finisher pw...

  • Page 457

    11-41 stacker tray control (cont’d) upper limit sensor pl17.11 3 1 2 st ack a sensor pl17.11 3 1 2 st ack b sensor pl17.11 3 1 2 finisher pwb pl17.13 dc com dc com dc com +5vdc +5vdc +5vdc a10 a12 a7 a9 a4 a6 j850 j862 vio vio vio gr y gr y gr y j862 j863 j863 j864 j864 2 1 3 3 3 2 1 2 3 dc330 [12-2...

  • Page 458: Finisher Service Parts List

    11-42 phaser 7750 printer service manual finisher service parts list pl 17.1 finisher.

  • Page 459

    11-43 finisher pl 17.1 no. Part number qty description 1 116-1292-00 1 gate cover 2 116-1280-01 1 h-transport assembly 3 staple finisher 4 116-1821-00 thumbscrew 5 rack assembly 6 116-1244-00 1 right cover 7 116-1278-00 1 stacker tray 8 116-1279-00 1 screw 9 bracket 10 front bracket 11 stud screw 12...

  • Page 460: Pl 17.2 Gate Assembly

    11-44 phaser 7750 printer service manual pl 17.2 gate assembly gate assemblies pl 17.2 no. Part number qty description 1 116-1292-00 gate cover 2 bearing 3 116-1293-00 gate assembly {items 4 - 14} 4 in gate 5 in gate lever 6 116-1294-00 gate bracket s7750-405.

  • Page 461

    11-45 pl 17.3 horizontal transport assembly: 1 of 2 h-transport assembly: 1 of 2 pl 17.3 no. Part number qty description 1 116-1290-00 h-transport cover assembly 3 116-1291-00 magnet 4 screw 6 116-1246-00 roll 9 116-1289-00 entrance upper cover assembly 13 116-1821-00 thumbscrew 14 116-1259-00 front...

  • Page 462

    11-46 phaser 7750 printer service manual pl 17.4 horizontal transport assembly: 2 of 2 horizontal transport assembly: 2 of 2 pl 17.4 no. Part number qty description 1 h-transport roll (in) 2 h-transport roll (out) 3 116-1284-00 1 h-transport belt 4 roll 5 support 6 1 bearing 7 harness guide 8 cover ...

  • Page 463

    11-47 10 116-1285-00 top tray full sensor 11 116-1247-00 exit sensor 12 116-1286-00 gate in solenoid assembly 13 gate in solenoid 14 spring {p/o item 12} 15 link 16 cover 17 ground wire 18 wire harness 19 wire harness 20 bearing 21 116-1281-00 gear (37t) 22 116-1282-00 gear (30t) 23 116-1283-00 gear...

  • Page 464: Pl 17.5 Covers

    11-48 phaser 7750 printer service manual pl 17.5 covers s7750-408.

  • Page 465

    11-49 covers pl 17.5 no. Part number qty description 1 116-1238-00 front cover 2 116-1239-00 rear cover 3 116-1236-00 top cover 4 116-1237-00 left cover 5 116-1245-00 front cover door 6 left panel 7 hinge n/s 8 116-1844-00 magnet.

  • Page 466

    11-50 phaser 7750 printer service manual pl 17.6 top cover and eject roll s7750-409.

  • Page 467

    11-51 top cover and eject roll pl 17.6 no. Part number qty description 1 116-1262-00 1 top open cover assembly 2 arm 3 bearing 4 bracket 5 spring 6 support 7 bracket 8 shaft 9 116-1302-00 1 eject pinch roll 10 116-1823-00 1 eject chute 11 116-1272-00 1 stack height sensor assembly 12 1 actuator 13 b...

  • Page 468

    11-52 phaser 7750 printer service manual pl 17.7 paper transport: 1 of 2 s7750-410

  • Page 469

    11-53 paper transport: 1 of 2 pl 17.7 no. Part number qty description 1 116-1248-00 1 actuator cam 2 116-1249-00 1 clutch assembly, decurler cam 3 cam 4 shaft 5 bearing 6 116-1250-00 1 arm 7 116-1302-00 1 decurler roll 8 116-1847-00 1 gear (40z / 20t) - part of a kit 9 116-1847-00 1 gear (40z) - par...

  • Page 470

    11-54 phaser 7750 printer service manual pl 17.8 paper transport: 2 of 2 s7750-411.

  • Page 471

    11-55 paper transport: 2 of 2 pl 17.8 no. Part number qty description 1 116-1266-00 1 cam bracket assembly 2 116-1847-00 1 pully - part of a kit 3 116-1847-00 1 gear (15z) - part of a kit 4 116-1271-00 1 belt 5 116-1847-00 1 gear (30z) - part of a kit 6 collar 7 116-1847-00 1 gear pully - part of a ...

  • Page 472

    11-56 phaser 7750 printer service manual pl 17.9 staple unit assembly s7750-412.

  • Page 473

    11-57 staple unit assembly pl 17.9 no. Part number qty description 1 116-1255-00 1 carriage assembly (item 2-6) 2 bracket assembly 3 116-1256-00 1 staple move motor 4 gear 5 staple sensor 6 roll 7 116-1259-00 1 staple front corner sensor 8 plate 9 116-1254-00 1 rail (rep 17.9.1) 10 116-1257-00 1 sta...

  • Page 474

    11-58 phaser 7750 printer service manual pl 17.10 compiler tray assembly s7750-413.

  • Page 475

    11-59 compiler tray assembly pl 17.10 no. Part number qty description 1 116-1251-00 1 compiler tray assembly (item 2-15) 2 116-1252-00 1 front/rear tamper motor assembly 3 plate 4 116-1253-00 1 front /rear tamper home sensor 5 rack 6 actuator 7 tamper 8 finger 9 spring 10 116-1234-00 1 compiler pape...

  • Page 476

    11-60 phaser 7750 printer service manual pl 17.11 stacker elevator assembly s7750-414.

  • Page 477

    11-61 stacker elevator assembly pl 17.11 no. Part number qty description 1 116-1287-00 1 stacker motor assembly 2 116-1276-00 1 front elevator bracket 3 clamp 4 bearing 5 116-1274-00 1 gear (rear) 6 actuator 7 116-1275-00 1 gear (front) 8 stacker tray bracket assembly 9 116-1273-00 1 rack 10 tray gu...

  • Page 478: Pl 17.12 Exit Assembly

    11-62 phaser 7750 printer service manual pl 17.12 exit assembly s7750-415.

  • Page 479

    11-63 exit assembly pl 17.12 no. Part number qty description 1 gear (48z) 2 bearing 3 116-1243-00 1 exit shaft 4 collar 5 gear (32z / 18t) 6 bearing 7 116-1304-00 1 paddle gear shaft (rep 17.12.1) 8 paddle bearing 9 lower exit chute 10 116-1302-00 1 pinch roll (exit 1) 11 pinch roll (exit 2) 12 pinc...

  • Page 480

    11-64 phaser 7750 printer service manual pl 17.13 electrical components s7750-416.

  • Page 481

    11-65 electrical components pl 17.13 no. Part number qty description 1 board cover 2 116-1235-00 1 finisher board 3 116-1314-00 1 rom 4 pwb bracket 5 116-1824-00 dc harness 6 116-1825-00 cable 7 116-1233-00 1 top cover/front door interlock switch 8 116-1253-00 1 docking interlock switch 9 spring pla...

  • Page 482

    11-66 phaser 7750 printer service manual pl 17.14 finisher rack (stand) s7750-417.

  • Page 483

    11-67 7.14 finisher rack (stand) no. Part number qty description 1 116-1315-00 front rack 2 1 front cover 3 1 knob screw 4 screw 5 bracket 6 stop 7 1 spring plate 8 1 rail 9 foot 10 front rack 11 116-1316-00 rear rack assembly 12 rear cover 13 rear rack 14 bracket 15 bottom plate.

  • Page 484

    11-68 phaser 7750 printer service manual.

  • Page 485: Contents...

    A appendix appendix contents... ■ menu map ■ service diagnostic menu map ■ service usage profile status code definitions table ■ chain-link code definitions ■ paper weight equivalence table.

  • Page 486: Menu Map

    A-2 phaser 7750 printer service manual menu map front panel buttons: main menu: up arrow ok information back cancel down arrow information walk-up features printer setup troubleshooting information walk-up features printer setup troubleshooting ready to print. Ready to print. Walk-up features* infor...

  • Page 487

    A-3 printer setup paper handling setup calibration setup postscript setup pcl setup front panel setup printer controls file security troubleshooting help guide paper jams print quality problems network log pages* service tools page 2 of 2 (continued) dn, gx, or dxf configuration tray 3, 4, 5 finishe...

  • Page 488: Service Diagnostic Menu Map

    A-4 phaser 7750 printer service manual service diagnostic menu map service diagnostics menu map print service menu map prints a service diagnostic menu map and exits service diagnostics. General status provides the current print engine status. Engine rom version configuration ambient temp/humidity f...

  • Page 489

    A-5 service usage profile status codes code definition code definition 0 ready 20 tray 2 missing, not printing from 2 1 accumulator near end of life 21 tray 1 missing, not printing from 1 2 fuser near end of life 22 stapler not ready 3 belt cleaner near end of life 23 stapler near empty 4 transfer r...

  • Page 490

    A-6 phaser 7750 printer service manual 41 stapler not ready 66 no laser paper hc tray 2, 42 top cover interlock open 67 no heavy paper hc tray 2, 43 finisher front door open 68 no laser paper tray 3, printing 44 ht interlock sensor open 69 no heavy paper tray 3, printing 45 docking interlock open 70...

  • Page 491

    A-7 91 tray 4 missing, printing from 4 116 ohp detected in tray 4, high 92 tray 3 missing, printing from 3 117 front door open 93 tray 2 missing, printing from 2 118 left door open 94 tray 1 missing, printing from 1 119 upper left door open 95 hc trays, tray 4 missing 120 lower left door open 96 hc ...

  • Page 492

    A-8 phaser 7750 printer service manual 140 ht entrance jam 165 autoselect needs paper 141 compiler exit sensor off jam 166 autoselect needs heavy 142 tray 1 needs paper 167 autoselect needs thin 143 tray 1 needs heavy 168 autoselect needs thick 144 tray 1 needs thin 169 autoselect needs trans 145 tr...

  • Page 493

    A-9 190 size mismatch, load b4 jis 212 fuser missing 191 size mismatch, load b5 jis 213 fuser life expired / fuser at end of life 192 size mismatch, load b6 jis 214 accumulator belt missing 193 transparency size mismatch, load letter 215 system halt, service call required 194 transparency size misma...

  • Page 494

    A-10 phaser 7750 printer service manual 235 fuser sts rear fail 260 finisher error 119 236 fuser sts rear warm time fail 261 finisher error 120 237 fuser ssr2 fail 262 finisher error 121 238 fan fail 263 finisher error 122 239 waste toner sensor fail 264 finisher error 123 240 yellow atc fail 265 fi...

  • Page 495

    A-11 missing chain link codes definitions 04-605 iot nvm empty 07-270 tray 2 paper size sensor broken 07-271 tray 3 paper size sensor broken 07-272 tray 4 paper size sensor broken (3tm) 07-273 tray 5 paper size sensor broken (3tm) 07-274 mpt paper size sensor broken 07-276 tray 4 paper size sensor b...

  • Page 496

    A-12 phaser 7750 printer service manual paper weight equivalence table us postcard thickness (mm) us bond weight (lbs) us text book weight (lb) us cover weight (lb) us bristol weight (lb) us index weight (lb) us tag weight (lb) metric weight (g/m 2 ) 16 41 22 27 33 37 60 17 43 24 29 35 39 64 20 50b ...

  • Page 497: Symbols

    Service manual index – 1 index symbols (hcf) tray 3 removal , 8-59 (hcf) tray 4 and paper transport disassembly , 8-59 +24 vdc - 1 of 2 wiring diagram , 10-29 +24 vdc interlock circuit troubleshooting , 4-19 +24vdc 2 of 2 wiring diagram , 10-30 +5 vdc interlock circuit troubleshooting , 4-20 numeric...

  • Page 498

    Phaser 7750 printer index – 2 diagnostic test , 4-7 magenta failure (code 13) , 3-13 setup adjustment , 6-14 theory of , 2-24 yellow failure (code 12) , 3-13 atc sensor setup diagnostic test , 4-11 b belt cleaner disassembly , 8-34 belt edge learn diagnostic test , 4-11 belt edge sensor diagnostic t...

  • Page 499

    Service manual index – 3 wiring diagram , 10-59 drum drive control k wiring diagram , 10-60 drum life control wiring diagram , 10-61 drum motor failure (code 60) , 3-35 duplex chute disassembly , 8-13 duplex clutch diagnostic test , 4-11 duplex gate solenoid diagnostic test , 4-11 duplex motor diagn...

  • Page 500

    Phaser 7750 printer index – 4 failure (code 113) , 3-49 front corner on/off failure (code 118/ 119) , 3-57 mode logic failure (code 125) , 3-61 move sensor on/off failure (code 111/ 112) , 3-47 front panel adjust, diagnostics , 4-3 configuration , 1-6 disassembly , 8-5 key shortcuts , 1-6 keys , 1-6...

  • Page 501

    Service manual index – 5 wiring diagram , 10-40 laser power check diagnostic test , 4-12 laser scan drive control wiring diagram , 10-41 laser shutter control wiring diagram , 10-42 laser unit laser unit failure (code 10) , 3-12 polygon motor failure (code 11) , 3-12 theory of , 2-15 laser unit (ros...

  • Page 502

    Phaser 7750 printer index – 6 p paper feed motor lta/hcf disassembly , 8-61 paper feed motors diagnostic test , 4-9 paper feed sensing , 2-5 paper feeding wiring diagram , 10-54 paper lift motor diagnostic test , 4-9 disassembly , 8-17 paper on belt (pob) sensor diagnostic test , 4-6 paper path serv...

  • Page 503

    Service manual index – 7 reset engine nvram diagnostics , 4-12 resetting all printer defaults , 6-17 clear tech rep faults , 6-20 factory settings , 6-16 nvram , 6-16 resetting nvram, image processor , 6-16 restore factory settings, margins , 6-17 previous color settings , 6-16 right hand lift jack ...

  • Page 504

    Phaser 7750 printer index – 8 disassembly , 8-28 toner waste cartridge diagnostic test , 4-7 top cover disassembly , 8-5 top rear cover disassembly , 8-7 transfer roller contact failure (code 20) , 3-17 retract failure (code 21) , 3-17 transfer roller sensor diagnostic test , 4-7 tray lift failure (...

  • Page 505

    071-0864-00 a.