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Oki ML420 Series Maintenance Manual

Manual is about: High Performance 10/100 Base-T Ethernet Network Print Server

Summary of ML420 Series

  • Page 1

    Oki data confidential ml420/421 maintenance manual for rev "e0" and higher 032411a.

  • Page 2

    Copyright © 2008 by oki data. All rights reserved oki data america's, inc. ("oki data"), authorizes you to view, copy, and print documents published by oki data for noncommercial use within your organization only. In consideration of this authorization, you agree and acknowledge that any copy of the...

  • Page 3

    42113931th rev.1 3 / oki data confidential.

  • Page 4: Contents

    Oki data confidential 42113931th rev.1 4 / contents 1. Configuration ...............................................................................................6 1.1 standard printer configuration ............................................................................................ 6 1.2 ...

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    Oki data confidential 42113931th rev.1 5 / 3.3.20 rear tractor assy ................................................................................................. 73 3.3.21 rear pressure assy .............................................................................................. 74 3.3.22 ...

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    Oki data confidential 42113931th rev.1 6 / 1. Configuration 1.1 standard printer configuration this printer consists of the following assemblies: figure 1-1 configuration upper cover access cover assy platen knob sheet guide assy main control pcb power supply unit pull-up roller assy main chassis as...

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    Oki data confidential 42113931th rev.1 7 / 1.2 options (1) cut sheet feeder unit (csf) (narrow and wide versions available) single-bin csf (2) pull-tractor assy attachment assy.

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    Oki data confidential 42113931th rev.1 8 / (3) bottom push tractor unit (4) roll paper stand (narrow only) (5) option i/f board • rs232c serial interface board • oki lan board.

  • Page 9

    Oki data confidential 42113931th rev.1 9 / 2. Theory of operation 2.1 electrical operation the electrical operation of the printer circuit is described in this section. 2.1.1 summary figure 2-1 shows the block diagram of the printer. The main control pcb is made up of the soc (system on chip), perip...

  • Page 10

    Oki data confidential 42113931th rev.1 10 / reset-n ieee1284 deriver ic flash rom osc 48mhz option csf or roll paper stand operation panel pcb head alarm circuit alarm-p alarm-p 12v print head head drive circuit sp alarm circuit sp photo sensor motor driver ic dc-dc switching converter 40v 40v 40v f...

  • Page 11

    Oki data confidential 42113931th rev.1 11 / (2) program rom (external flash rom) the program to make the printer work is stored in flash rom as external rom. Flash rom that can be installed is 64mbit(16 x 4096k) or less. The access timing of the outline to flash rom is shown in the following. A0~a21...

  • Page 12

    Oki data confidential 42113931th rev.1 12 / 2.1.3 initialization this printer is initialized when the power is turned on or when the i-prime-n signal is input from the host side via the parallel interface. For the initialize operation, the rst-n signal is first output from the reset circuit to reset...

  • Page 13

    Oki data confidential 42113931th rev.1 13 / 2.1.4 interface control (1) parallel interface the parallel data input from the host to the interfaced soc is latched to its internal register at the falling edge of the strobe-n signal. At the same time, the soc sets the busy signal to the high level to i...

  • Page 14

    Oki data confidential 42113931th rev.1 14 / (2) universal serial bus (usb) universal serial bus specification revision 2.0 (full speed) compliance. 1) connector • printer side : “b” receptacle (upstream input to the usb device) • cable side : series “b” plug 2) cable • cable length : approx 1.8m (a ...

  • Page 15

    Oki data confidential 42113931th rev.1 15 / 8) signal level • input / output level parameter input levels : high (driven) high (floating) low output levels : low high (driven) output signal crossover voltage symbol v ih v ihz v il ol oh v crs min. 2.0 2.7 0.0 2.8 1.3 max. 3.6 0.8 0.3 3.6 2.0 units v...

  • Page 16

    Oki data confidential 42113931th rev.1 16 / head drive timing chart dt1 dt2 head drive current 2.1.5 print control print data is transmitted as parallel data (hd01~hd09) from soc to print head. Soc generates print timing and drive time. Print data soc driver print head hd01-p~ hd09-p main control pc...

  • Page 17

    Oki data confidential 42113931th rev.1 17 / head gap range 1 2 3 4 5 print speed 100% 90% 85% 85% 80% drive time short long (drive time lengthens at each step.) (e) print mode compensation according to the thickness of the printing medium, the print mode is compensated as shown in the table below: a...

  • Page 18

    Oki data confidential 42113931th rev.1 18 / spu-p spv-p spw-p uh out vh out wh out ul out vl out wl out spu_out-p l l op h h op l l op h h op l l op h h op l l op h h op spv_out-p h op l l op h h op l l op h h op l l op h h op l l op h spw_out-p op h h op l l op h h op l l op h h op l l op h h op l ...

  • Page 19

    Oki data confidential 42113931th rev.1 19 / 1/720" 1/120" spu spv spw phase-a phase-b 1/144" ipt 10 cpi ipt 12 cpi ipt 15 cpi ipt 17 cpi ipt 20 cpi 1/180" 1/206" 1/240" (2) encoder disk in the operation of the spacing motor, the phase-a and phase-b signals are generated when the encoder disk interru...

  • Page 20

    Oki data confidential 42113931th rev.1 20 / soc mainfanon-p mainfanalm-p fuse 0v 0v +12v fan motor (4) fan control the motor that uses it is dc brushless fan motor. The outline circuit composition is as follows. On/off is controlled by control signal mainfanon-p from soc. When the motor stops by som...

  • Page 21

    Oki data confidential 42113931th rev.1 21 / soc operation panel control ic optxd opclk opclr-n oprxd 13 16 15 swi1 swi4 swi3 swi2 command and data latch led driver switch controller +5v 14 2.1.7 operation panel the clock synchronization opclk of soc is used to input the switch data and output the le...

  • Page 22

    Oki data confidential 42113931th rev.1 22 / optxd opclk oprxd opclr-n 12 32 31 6 7 5 or 8 bit0 bit7 command (first) command (second) command response (first) command response (second) note bit0 bit7 reset within ic power on write instruction for ic reset ic write for led data, etc. Read instruction ...

  • Page 23

    Oki data confidential 42113931th rev.1 23 / 2.1.8 alarm circuit (1) head drive time alarm circuit this circuit monitors the drive time using the dt1alm1-n signal interlocked with the overdrive signal of each drive circuit. If the drive time of any drive circuit exceeds the specified time, the drive ...

  • Page 24

    Oki data confidential 42113931th rev.1 24 / stop mode up mode down temp 125 °c 118 °c 116 °c (5) overheat alarm (a) head overheat alarm the voltage of the output htemp signal of the thermistors, one of which is contained in the print head is monitored by the a/d port of the soc to control the voltag...

  • Page 25

    Oki data confidential 42113931th rev.1 25 / stop temp 105 °c 95 °c (b) sp motor overheat alarm the voltage of the output sptemp signal of the thermistors, one of which is contained in the sp motor, is monitored by the a/d port of the soc to control the voltage. Mode and print control • when the temp...

  • Page 26

    Oki data confidential 42113931th rev.1 26 / ac fuse power supply unit. +5vdc +40vdc sw alm-p psave-p filter circuit electric current circuit transformer 40v circuit 5v circuit sw control circuit alarm circuit power save circuit 2.1.9 power supply unit this power supply unit is a switching power supp...

  • Page 27

    Oki data confidential 42113931th rev.1 27 / (4) alarm function (see 2.1.8) when an alm-p signal has been output from the control unit, this function suspends switching and cuts off all output. This state is maintained after the power switch is turned off until the power supply resumes about 30 secon...

  • Page 28

    Oki data confidential 42113931th rev.1 28 / 2.2 mechanical operation 2.2.1 printhead mechanism and operation (see figure 2-2.) the printhead is a spring charged 9-pin driving head using a permanent magnet. It is attached to the carriage, which moves in parallel with the platen. Electrically, this un...

  • Page 29

    Oki data confidential 42113931th rev.1 29 / (2) operation of printhead (see figure 2-3.) (a) when the printhead is idle, the armature is attracted by a permanent magnet and the spring fixing the armature is compressed. The print wires fixed to each armature are thus concealed under the wire guide. (...

  • Page 30

    Oki data confidential 42113931th rev.1 30 / (2) when not printing (1) when printing figure 2-3 paper print wire printhead platen wire guide paper print wire thermistor magnet assembly spacer armature assembly yoke paper.

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    Oki data confidential 42113931th rev.1 31 / 2.2.2 spacing operation (see figure 2-4.) the spacing mechanism consists of a carriage shaft mounted in parallel with the platen, and a carriage frame that moves along the shaft. It is driven by a dc motor mounted on the bottom of the carriage frame. Items...

  • Page 32

    Oki data confidential 42113931th rev.1 32 / 2.2.3 head gap adjusting (see figure 2-5.) the head gap adjusting lever moves back and forth to tilt the carriage frame, altering the gap between the printhead and the platen. The adjusting screw, which is connected to the adjusting gear rotates when the a...

  • Page 33

    Oki data confidential 42113931th rev.1 33 / figure 2-5 range from 5 to 1 range from 1 to 5 platen range platen narrows c.C.W. C.W. Carriage shaft printhead printhead guide rail adjusting screw adjusting screw adjusting gear idler gear adjusting lever 1 2 3 4 5 adjusting cam widens.

  • Page 34

    Oki data confidential 42113931th rev.1 34 / 2.2.4 ribbon drive (see figure 2-6.) the ribbon driver mechanism moves the ribbon in synchronization with the space motor operation. The ribbon drive mechanism consist of the following items: (a) ribbon drive gear assembly (b) ribbon gear (space motor) (c)...

  • Page 35

    Oki data confidential 42113931th rev.1 35 / 2.2.5 paper feed operation feeding of the paper is performed by turning the platen and the pin tractor, which is driven by the lf pulse motor. Item of the paper feed mechanism are as follows: (a) pulse motor with gears (b) decelerating gear (c) platen (d) ...

  • Page 36

    Oki data confidential 42113931th rev.1 36 / (1) cut sheet and continuous sheet switching mechanism (see figure 2-7.) three different paper paths can be selected and set by the change lever. (a) top (for cut sheet) when the cut sheet is used in the manual mode or fed by the csf (option), set the chan...

  • Page 37

    Oki data confidential 42113931th rev.1 37 / change arm change lever change gear shaft rear switch bottom switch switch lever release shaft senser pcb figure 2-7 top bottom change lever tractor gear change gear rear reset spring platen gear (r) platen idle gear (bottom tractor unit).

  • Page 38

    Oki data confidential 42113931th rev.1 38 / (2) cut-sheet feeder operation (see figure 2-8.) the pulse motor used for the paper feed mechanism is mounted on the left of the frame, and the rotation of the motor is transmitted through decelerating gears (lf idle gear, platen gear) to the platen. When ...

  • Page 39

    Oki data confidential 42113931th rev.1 39 / figure 2-9 (3) continuous paper feed operation (rear) (see figure 2-9.) the force transmitted to the platen, rotates the tractor gear through platen gear, the idler gear and the change gear. The rotation of the tractor gear makes the pin tractor belt rotat...

  • Page 40

    Oki data confidential 42113931th rev.1 40 / (4) push and pull tractor mechanism (option) (see figure 2-10). This mechanism consist of an optional pull tractor and a standard push tractor mechanism. This mechanism can perform forward and reverse feed by setting continuous sheets to the push tractor a...

  • Page 41

    Oki data confidential 42113931th rev.1 41 / figure 2-11 continuous sheet form pull tractor assembly sheet feeder shaft drive gear lf motor idle gear lf idle gear platen gear platen (5) pull tractor mechanism (option) (see figure 2-11.) bottom feed of continuous sheets is possible only when an option...

  • Page 42

    Oki data confidential 42113931th rev.1 42 / figure 2-12 idle gear tractor change gear tractor idle gear tractor drive gear platen gear change gear platen (6) bottom push feed operation (option) (see figure 2-12.) the bottom push feed of the continuous sheet is possible only when the bottom tractor f...

  • Page 43

    Oki data confidential 42113931th rev.1 43 / (7) paper clamp mechanism (see figure 2-13.) when setting the change lever to the bottom , top or rear position, the operation of the front release gear arm changes according to the position of the release cam. And at the same time, the position of the cam...

  • Page 44

    Oki data confidential 42113931th rev.1 44 / figure 2-13 top bottom rear change lever front release gear arm platen release cam.

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    Oki data confidential 42113931th rev.1 45 / figure 2-14 bottom paper end lever paper end sensor paper end lever sensor lever shaded portion b a 2.2.6 paper detection mechanism (see figure 2-14.) (1) cut sheet detection when the cut sheet is inserted, the point a is pushed backward and the paper near...

  • Page 46

    Oki data confidential 42113931th rev.1 46 / figure 2-15 printhead carriage frame assembly platen ribbon protector (4) top line print mechanism (see figure 2-15.) the front edge of the sheet is protected by the ribbon protector so that it can stop at a position just near to the print head (0 tear off...

  • Page 47

    Oki data confidential 42113931th rev.1 47 / 2.2.7 automatic sheet feed this function is used to feed in the sheet automatically up to the print start position when the cut sheet or the continuous sheet is used. [operational procedure] (1) when using the cut sheet 1) set the change lever to the top p...

  • Page 48

    Oki data confidential 42113931th rev.1 48 / detection of the sheet supplied pe lf action line feed (about 3 inches) until the detection of the sheet supplied (2) when using the continouos paper 1) set the change lever either to the rear side or the bottom side position. (see figure 2-16.) 2) set a s...

  • Page 49

    Oki data confidential 42113931th rev.1 49 / paper end detection pe reverse lf until paper end or 19 inches max. Lf action park reverse lf from p.E. Sensor to tractor feed assy. 2.2.8 paper park function (continuous paper) continuous sheets which have been inserted can be reversed automatically by us...

  • Page 50

    Oki data confidential 42113931th rev.1 50 / 3. Assembly/disassembly this section explains the procedures for removing and installing various assemblies and units in the field. Description is mainly limited to the removal procedure; installation should basically be performed in the reverse sequence o...

  • Page 51

    Oki data confidential 42113931th rev.1 51 / 3.2 service tools table 3.1 lists the tools necessary for replacing printed circuit boards and parts of units in the field. Table 3.1 service tools 1 no. 1-100 phillips 1 screws screwdriver 2.6 mm 2 no. 2-200 phillips 1 screws screwdriver 3-5 mm 3 no. 3-10...

  • Page 52

    Oki data confidential 42113931th rev.1 52 / figure 3-1 printer unit notes on installation: (1) make sure that there is not any dust or oil on the connector contact sections a to c. If it is found, wipe it off by alcohol. 3.3 disassembly/reassembly procedure this section explains the assembly replace...

  • Page 53

    Oki data confidential 42113931th rev.1 53 / [how to change parts] this section explains how to change parts and assemblies appearing in the disassembly diagram below. Printer unit 3.3.1 printhead 3.3.2 ribbon protector 3.3.3 pull-up roller assy 3.3.4 upper cover, access cover and sheet guide 3.3.5 g...

  • Page 54

    Oki data confidential 42113931th rev.1 54 / figure 3.3.1 figure 3.3.2 3.3.1 printhead (1) open the access over. (2) pull up and rotate the head clamp 1 to unclamp the printhead 2 as shown fig. 3.3.1. (3) disconnect the printhead 2 from pc connector 3. (4) to install, follow the removal steps in the ...

  • Page 55

    Oki data confidential 42113931th rev.1 55 / 3.3.2 ribbon protector (1) remove the printhead (see 3.3.1). (2) open the pull-up roller cover 1. (3) raise and remove the ribbon protector 2. (4) to install, follow the removal steps in the reverse order. 2 1.

  • Page 56

    Oki data confidential 42113931th rev.1 56 / 3.3.3 pull-up roller assy (1) open the access cover 1. (2) lift up the sheet guide assy 4 to remove. (3) tilting the pull-up roller assy 2 toward the front, remove from the shaft of platen assy 3. (4) to install, follow the removal steps in the reverse ord...

  • Page 57

    Oki data confidential 42113931th rev.1 57 / 3.3.4 upper cover assy, access cover assy and sheet guide assy (1) pull off the platen knob 1. (2) turn the change lever 2 toward the bottom position. (3) insert a flat-blade screwdriver into grooves (5 places) (4 places for narrow type) of frame and twist...

  • Page 58

    Oki data confidential 42113931th rev.1 58 / 3.3.5 gear case assy (1) remove the printhead (see 3.31). (2) remove the upper cover (see 3.3.4 (1) – (5)). (3) move the carriage assy to right hand side, remove two screws 1, then the space motor 2. (4) disconnect a carriage cable. (5) disengage claws (4 ...

  • Page 59

    Oki data confidential 42113931th rev.1 59 / 3.3.6 pc connector (1) remove the printhead (see 3.3.1). (2) remove the upper cover (see 3.3.4 (1) – (5)). (3) remove the gear case assy (see 3.3.5). (4) remove the pc connector 1 from the space motor assy 2. (5) to install, follow the removal steps in the...

  • Page 60

    Oki data confidential 42113931th rev.1 60 / 3.3.7 space motor, guide roller assy (1) remove the printhead (see 3.3.1). (2) remove the upper cover (see 3.3.4 (1) – (5)). (3) remove the gear case assy (see 3.3.5). (4) remove the pc connector (see 3.3.6). (5) remove screw 2, then the guide roller assy ...

  • Page 61

    Oki data confidential 42113931th rev.1 61 / 3.3.8 space rack (1) remove the printhead (see 3.3.1). (2) remove the upper cover (see 3.3.4 (1) – (5)). (3) remove the gear case assy (see 3.3.5). (4) remove the space motor (see 3.3.7). (5) remove the spring 1. (6) disengage the claw on left side of spac...

  • Page 62

    Oki data confidential 42113931th rev.1 62 / 3.3.9 carriage cable (1) remove the printhead (see 3.3.1). (2) remove the upper cover (see 3.3.4 (1) – (5)). (3) remove the gear case assy (see 3.3.5). (4) remove the space motor (see 3.3.7). (5) remove the space rack (3.3.8). (6) remove three screws 1, re...

  • Page 63

    Oki data confidential 42113931th rev.1 63 / 3.3.10 backup roller holder assy (1) remove the printhead (see 3.3.1), (2) remove the upper cover (see 3.3.4 (1) – (5)). (3) remove the gear case assy (see 3.3.5). (4) remove the space motor (see 3.3.7). (5) remove the backup roller spring 2. Disengage cla...

  • Page 64

    Oki data confidential 42113931th rev.1 64 / 3.3.11 platen assy (1) remove the printhead (see 3.3.1). (2) remove the ribbon protector (see 3.3.2). (3) remove the pull-up roller assy (see 3.3.3). (4) remove the upper cover (see 3.3.1 (1) – (5)). (5) turn the change lever 1 to the bottom position. (6) ...

  • Page 65

    Oki data confidential 42113931th rev.1 65 / 3.3.12 main control pcb (1) remove the upper cover (see 3.3.4 (1) – (5)). (2) remove three screws 1, and release the main control pcb 2 by lifting clamp 4. (3) disconnect all cables from main control pcb 2. (4) to install, follow the removal steps in the r...

  • Page 66

    Oki data confidential 42113931th rev.1 66 / 3.3.13 lf motor (1) remove the printhead (see 3.3.1). (2) remove the ribbon protector (see 3.3.2). (3) remove the pull-up roller assy (see 3.3.3). (4) remove the upper cover (see 3.3.4 (1) – (5)). (5) remove the platen assy (see 3.3.11). (6) remove the mai...

  • Page 67

    Oki data confidential 42113931th rev.1 67 / 3.3.14 operation panel pcb (1) remove the upper cover (see 3.3.4 (1) – (5)). (2) disconnect the cable 1 from connector 3 of main control pcb 2. (3) disengage claws on both sides from the frame, and remove the operation panel 4. (4) open claws (4 places) an...

  • Page 68

    Oki data confidential 42113931th rev.1 68 / 3.3.15 power supply unit, sensor pcb risk of electric shock there is a risk of electric shock during replacement of the power supply. Use insulating gloves or avoid direct contact with any conducting part of the power supply, and caution should be exercise...

  • Page 69

    Oki data confidential 42113931th rev.1 69 / 3.3.16 ac inlet and ac switch (1) remove the upper cover (see 3.3.4 (1) – (5)). (2) remove ac inlet 1 and ac switch 2 from the frame guide. (3) disconnect the cable 3 from the connector 4 on the power supply unit 5. (4) remove the screw 6. 5 3 6 1 2 4.

  • Page 70

    Oki data confidential 42113931th rev.1 70 / 3.3.17 change lever and gears (1) remove the upper cover (see 3.3.4 (1) – (5)). (2) remove the reset spring 1, then remove the idle gear 2, the tractor gear 4 and the change gear 5. (3) push back the protrusion of the change gear shaft 6 with a flatblade s...

  • Page 71

    Oki data confidential 42113931th rev.1 71 / 3.3.18 carriage shaft (1) remove the printhead (see 3.3.1). (2) remove the upper cover (see 3.3.4 (1) – (5)). (3) remove the main control pcb (see 3.3.12). Remove the fg plate (l) 2. (4) slide the carriage shaft 1 to the left side (in the direction of the ...

  • Page 72

    Oki data confidential 42113931th rev.1 72 / 3.3.19 paper pan (1) remove the printhead (see 3.3.1). (2) remove the ribbon protector (see 3.3.2). (3) remove the pull-up roller assy (see 3.3.3). (4) remove the upper cover assy (see 3.3.4 (1) – (5)). (5) remove the platen assy (see 3.3.11). (6) release ...

  • Page 73

    Oki data confidential 42113931th rev.1 73 / 3.3.20 rear tractor assy (1) remove the printhead (see 3.3.1). (2) remove the ribbon protector (see 3.3.2). (3) remove the pull-up roller assy (see 3.3.3) (4) remove the upper cover (see 3.3.4 (1) – (5)). (5) remove the reset spring (see 3.3.17 (3)) (6) re...

  • Page 74

    Oki data confidential 42113931th rev.1 74 / 3.3.21 rear pressure assy (1) remove the upper cover (see 3.3.4 (1) – (5)). (2) remove the change lever and gears (see 3.3.17). (3) remove the paper pan (see 3.3.19). (4) remove the rear pressure roller 1. (5) rotate the release shaft 2 and move it to the ...

  • Page 75

    Oki data confidential 42113931th rev.1 75 / micro switch switch lever switch lever 3.3.22 switch lever (1) remove the upper cover (see 3.3.4 (1) – (5)). (2) remove the power supply assy (see 3.3.15). (3) remove the change lever and gears (see 3.3.17). (4) remove the paper pan (see 3.3.19). (5) remov...

  • Page 76

    Oki data confidential 42113931th rev.1 76 / 4. Adjustment (1) be sure to carry out this adjustment with the printer mechanism mounted on the lower cover. (2) be sure to carry out this adjustment operation on a level and highly rigid work table (flatness: less than 0.039 inch or 1 mm) so as to minimi...

  • Page 77

    Oki data confidential 42113931th rev.1 77 / item no. Specification drawing adjustment method gap between the plat- en and the print head 1) parallelism ad- justment 4–1–1 variation of value at the left, the center and the right shall be less than 0.02 mm it shall be measured at 3 points: the left en...

  • Page 78

    Oki data confidential 42113931th rev.1 78 / item no. Specification drawing adjustment method note 1) the head gap shall be measured with the change lever set to rear position. Note 2) the head gap shall be measured positioning the platen gear (r) craw on the top. Note 3) move the adjust screw in clo...

  • Page 79

    Oki data confidential 42113931th rev.1 79 / item no. Specification drawing adjustment method gap between the con- tact and the monitor 0.3mm or more confirm followings. Make sure that the gap between the con- tact and the motor pcb is 0.3 mm or more. At the time of printing test, make sure that the ...

  • Page 80

    Oki data confidential 42113931th rev.1 80 / item no. Specification drawing adjustment method 4–2 1 ±0.5 confirm followings. (1) when the change lever is set at friction position, the gap between the platen and the paper pan at the rear side shall be 1 ±0.5mm. (2) when the change lever is set at rear...

  • Page 81

    Oki data confidential 42113931th rev.1 81 / item no. Specification drawing adjustment method rotation of the push tractor 4–4–1 to confirm: the tractor gear shall rotate smoothly when the change lever is set at friction posi- tion. Backlash between gears 4–4–2 approx. 0.05 to 0.11 mm to confirm: the...

  • Page 82

    Oki data confidential 42113931th rev.1 82 / item no. Specification drawing adjustment method ribbon feed 4–5–1 to confirm: ribbon shall be fed smoothly when the carriage is moved from side to side. Running load to spac- ing mechanism 4–5–2 to confirm: make sure that the power is turned off at the ti...

  • Page 83

    Oki data confidential 42113931th rev.1 83 / item no. Specification drawing adjustment method 4–6 to confirm: the idle gear of the lf motor and the platen gear (l) and the bias gear of the platen shall be in mesh in such way that the platen gear (l) and the bias gear rotate against each other to pinc...

  • Page 84

    Oki data confidential 42113931th rev.1 84 / no. Method 4–7 the factory default setting for the printer. To reset the printer to the factory default: (1) turn the printer off. (2) press and hold down the sel key and quiet key while turning on the printer. The print quality light will turn on the ligh...

  • Page 85: Cleaning and Lubrication

    Oki data confidential 42113931th rev.1 85 / 5. Cleaning and lubrication 5.1 cleaning [cautions] 1. Be sure to turn off the ac power switch before cleaning. Remove the ac power cord from the printer. 2. Avoid dust inside the printer mechanism when cleaning. 3. If a lubricated part has been cleaned, b...

  • Page 86

    Oki data confidential 42113931th rev.1 86 / 5.2 lubrication this printer is designed to be maintenance free and requires no lubrication during normal operation. However it is necessary to apply lubricant in case the printer is disassembled, reassembled, cleaned or parts have been changed. (1) cleani...

  • Page 87

    Oki data confidential 42113931th rev.1 87 / (5) lubrication point 1. Ribbon feed gear assy. 2. Space rack drive gear shaft (upper and lower) pm-b (0.006–0.002g) idle gear shaft (upper and lower) pm-b (0.006–0.002g) planetary gear shaft (upper and lower) em-30l-a space rack rack upper side approx. 35...

  • Page 88

    Oki data confidential 42113931th rev.1 88 / 3. Platen assy. Bias gear platen gear (l) grease the contact face of platen gear (l) and bias gear pm-b.

  • Page 89

    Oki data confidential 42113931th rev.1 89 / 4. Tractor driving mechanism 5. Tractor drive shaft 12345 12345 12345 12345 a-a arrow view sliding surface of fg spring and drive shaft end em-30l-a drive shaft bearing portion em-30l-a drive shaft bearing portion em-30l-a change lever tractor gear bearing...

  • Page 90

    Oki data confidential 42113931th rev.1 90 / 6. Pressure roller release shaft protruding portion - 2 portions em-30l-a rear roller holder shaft contact portion of rear holder and shaft em-30l-a contact portion of support spring and shaft em-30l-a sliding portion of release shaft and rear roller holde...

  • Page 91

    Oki data confidential 42113931th rev.1 91 / 7. Pull up roller assy. Pull-up roller frame pull-up roller shaft all bearing portions of pull-up roller shaft and pull-up roller frame em-30l-b gear and post em-30l-a.

  • Page 92

    Oki data confidential 42113931th rev.1 92 / 8. Main chassis assy. Grease portion grease portion at rib (n: 9 portions) em-30l-a grease portion (n: 3 portions) rear side em-30l-a 9. Carriage assy. Nk2-10-sus bearing portion of guide roller em-30l-b.

  • Page 93

    Oki data confidential 42113931th rev.1 93 / 6. Troubleshooting and repair 6.1 items to check before repair (1) check the inspection items specified in the instruction manual. (2) find out as many details of the trouble as possible from the customer. (3) inspect in the conditions as close as possible...

  • Page 94

    Oki data confidential 42113931th rev.1 94 / alarm category alarm led condition contents trouble shooting alarm sel menu 10cpi 15cpi operator alarm paper end alarm on off — — — from, cut sheet or bottom paper end set new paper. Paper change lever alarm on off — blink 1 off change lever is set to top ...

  • Page 95

    Oki data confidential 42113931th rev.1 95 / alarm category alarm led display alarm 10 12 15 17 20 prop hsd utl nlq lq remarks troubleshooting main control alarm firmware detection alarm mpu internal ram alarm program rom alarm wdt (watch dog timeout) alarm interrupt control alarm (happened illegal i...

  • Page 96

    Oki data confidential 42113931th rev.1 96 / alarm category alarm remarks troubleshooting spacing alarm spacing alarm print head homing alarm head thermistor alarm (open status) head thermistor alarm (short status) space ipt is not occurred within in specified timing. : led blink (200ms on, 200ms off...

  • Page 97

    Oki data confidential 42113931th rev.1 97 / a c inlet a c switch sensor pcb space motor f an motor printhead lf motor dc cable assy main control pcb centro-connector operation panel pcb power spply unit.

  • Page 98

    Oki data confidential 42113931th rev.1 98 / 6.4 connection circuit check for printhead and sp/lf motor (1) printhead signal connector pin number cn1 1 #1 2 #2 3 #4 4 #6 5 #8 6 7 8 9 10 11 #9 12 #7 13 #5 14 #3 15 thermistor (5k Ω at 25 ° c) head1 head2 head4 head6 head8 0v htemp +50v +50v +50v head9 ...

  • Page 99

    Oki data confidential 42113931th rev.1 99 / (2) line feed motor resistance of each coil should be about 10.4 Ω . Signal connector pin number lf1 lf2 lf3 lf4 cn4 lf motor 1 2 3 4 (3) space motor resistance of each coil should be about 22.4 Ω . Signal connector pin number sp-u sp-v sp-w spa spb sptemp...

  • Page 100

    Oki data confidential 42113931th rev.1 100 / pin no. Signal 12 powsave-p 8 0vl 9 +5v 10 +5v 11 alm-p 7 0vl 6 0vp 5 0vp 4 0vp 2 +40v 3 +40v 1 +40v usb cent csf 1 19 36 18 exif 16 pow lfmot 1 4 1 15 2 16 1 30 pe c e hd1 mainf an op 1 1 1 2 3 6 7 2 27 23 k a 15 6.5 troubleshooting flow chart 1 power is...

  • Page 101

    Oki data confidential 42113931th rev.1 101 / 2 no spacing operation (the alarm led blinks) is carriage assembly binding or jammed? No yes check around space motor to repair the mechanism of space belt, idle pulley, ribbon feed mechanism, and carriage frame etc. Replace space motor assy. Remedied? No...

  • Page 102

    Oki data confidential 42113931th rev.1 102 / 3 homing does not end normally yes no check around space motor to repair the mechanism. (space rack, ribbon feed assembly back up roller, carriage frame, support protector and ribbon protector.) remedied? No yes end replace space motor assy. Replace space...

  • Page 103

    Oki data confidential 42113931th rev.1 103 / 4 paper jam while paper insertion jam 1 check around pressure roller mechanism. • front pressure springs are narrow: 3 pcs; wide: 5 pcs) mounted properly or not. • tension of all of front pressure rollers is properly. • make sure of the fitting position o...

  • Page 104

    Oki data confidential 42113931th rev.1 104 / 5 smearing/missing dots does alarm led blink and display alarm? No yes see tables 6.2 and 6.3 for troubleshooting information. Replace printhead. Remedied? No yes end replace the main control pcb. Remedied? No yes end replace carriage cable or space motor...

  • Page 105

    Oki data confidential 42113931th rev.1 105 / 6 faint or dark print is the print head gap set properly? Yes no adjust the printhead gap (see section 5). Remedied? No yes end replace printhead. Remedied? No yes end replace the main control pcb. Remedied? No yes end replace ribbon feed mechanism..

  • Page 106

    Oki data confidential 42113931th rev.1 106 / 7 ribbon feed trouble remove the ribbon cartridge. Move carriage to left and right. Does the ribbon drive shaft rotate? No yes change ribbon cartridge. Remove ribbon feed mechanism. Move carriage to left and right. Does the ribbon drive shaft rotate? No y...

  • Page 107

    Oki data confidential 42113931th rev.1 107 / 8 line feed trouble turn the power off, and rotate the platen manually. Does the platen rotate smoothly? Yes no is the platen gear (l) broken? No yes replace platen assembly. Is the lf motor idle gear broken? No yes replace the lf motor assembly or lf idl...

  • Page 108

    Oki data confidential 42113931th rev.1 108 / 9 malfunction of switch on operation panel is the cn1 of operation panel connected to the op on the main control pcb? Yes no connect the cable properly. Replace the operation panel pcb. Remedied? No yes end replace the main control pcb..

  • Page 109

    Oki data confidential 42113931th rev.1 109 / 0 data receiving failure is the sel led blinking? No yes printer went into the print suppress mode. Wait until printer to receives dc1 code, or change the menu item “print sup- press-ineffective” when the function is not required. Is the i/f rs232c? No ye...

  • Page 110

    Oki data confidential 42113931th rev.1 110 / 10-2 (rs232c i/f) printer i/f pin assignment. Is the correct cable used? Txd 2 pin, rxd 3 pin, yes no ssd 11 pin, dtr 20 pin, change i/f cable. Dsr 6 pin. Is alarm led blinking? No yes see tables 6.2 and 6.3 for the troubleshooting. Make sure of the param...

  • Page 111

    Oki data confidential 42113931th rev.1 111 / appendix a pcb layout pcb list (1) main control pcb (2) operation panel pcb (3) power supply unit (4) sensor pcb (1) main control pcb (2) operation panel pcb (3) power supply unit (4) sensor pcb usb cent csf 1 19 36 18 exif 16 pow lfmot 1 4 1 15 2 16 1 30...

  • Page 112: General

    Oki data confidential 42114131th rev.1 112 / appendix b rs-232c serial interface board (option) 1. General this section describes the operation of the rs-232c serial interface board installed in the printer as an option using a start-stop synchronization and serial communications circuit. This seria...

  • Page 113

    Oki data confidential 42114131th rev.1 113 / figure b-1 block diagram 2.2 circuit description a block diagram is shown in figure b-1. 2.2.1 operation at power on it becomes possible to use the rs232c board because soc of the main control pcb recog- nizes that the rsconect-n signal is connected with ...

  • Page 114

    Oki data confidential 42114131th rev.1 114 / 2.3 communication procedure flowchart 2.3.1 mode a figure b-2 store 0x40("@") in buffer. Ready/busy parity error ? Framing error ? Overrun error ? Set busy on yes yes yes yes yes yes yes set busy on received one character ? Is dsr signal valid ? Dsr signa...

  • Page 115

    Oki data confidential 42114131th rev.1 115 / 2.3.2 mode b figure b-3 x-on/x-off received one character ? Is dsr signal valid ? Dsr signal is high ? Parity error ? Framing error ? Overrun error ? Store the received character in buffer. Store 0x21("!") in buffer. Store 0x3f("?") in buffer. Receive buf...

  • Page 116

    Oki data confidential 42114131th rev.1 116 / 3. Troubleshooting flowchart 3.1 before repairing a fault before servicing the printer, ask the customer in what situation the trouble occurred and record the response. Before starting troubleshooting, operate the printer in the same situation as that at ...

  • Page 117

    Oki data confidential 42114131th rev.1 117 / 117 equivalent to cannon db-25p txd rxd rts cts cd ssd dtr dsr 2 3 4 5 8 11 20 6 3.3 local test 3.3.1 circuit test mode 3.3.1.1 setting (1) diagnostic test (set by menu) (2) test connector connect the test connector shown in figure b-9 to the interface co...