Xerox Phaser 3110 Service Manual

Summary of Phaser 3110

  • Page 1

    Service laser printer phaser 3110 phaser 3210 manual laser printer contents 1. Precautions 2. Specifications 3. Disassembly and reassembly 4. Troubleshooting 5. Exploded views and parts list 6. Block diagram 7. Connection diagram 8. Electrical parts list 9. Schematic diagram.

  • Page 2: 1. Precautions

    Precautions 1-1 1. Precautions 1-1 safety precautions 1-2 precautions on disassembly and reassembly please read the following carefully to prevent any accidents and not to damage the unit during service. 1. Safety precautions there are some electric or machinery parts with safety related property. I...

  • Page 3

    Precautions 1-2 1-3 tools for troubleshooting the following tools are recommended for safe and smooth troubleshooting described in this service manual. Dcu(diagnostic control unit) standard: test equipment to diagnose the laser printer supplied by samsung electronics. Dvm(digital volt meter) standar...

  • Page 4: 2. Specifications

    Specifications 2-1 2. Specifications speed resolution fist printing time) warm-up time power consumption acoustic noise dimension weight processor memory emulation interface os support n/w input output manual media type type life pick up roller feed roller transfer roller fuser key & led lcd toner s...

  • Page 5

    3-1-1 front cover 1. Pull the both side of the cover to open. 2. Remove a screw and remove the stopper that holds the printer cover. 3. Loosen the right lower part of the cover, then push the cover in the direction of arrow to loosen the left lower part. 4. Remove a screw of the front cover pcb and ...

  • Page 6

    Disassembly and reassembly 3-2 3-2 led panel pba 1. Before you remove other covers, you should remove. • front cover (see [3-1 main cover]) 2. Remove two screws of pcb cover, and widen the hooks( ) to remove. 3. Remove two screws, and remove led panel. 4. Remove pcb from the pcb cover. 3-3 lsu(laser...

  • Page 7

    Disassembly and reassembly 3-3 3-4 transfer roller 1. Open the front cover. 2. Use a proper tool("-" type screwdriver) to pull the one end of the roller slightly, then take it out. 3-5 motor assembly 1. Before you remove the motor assembly, you should remove: • main cover (see [3-1 main cover]) • sh...

  • Page 8

    Disassembly and reassembly 3-4 3-6 hvps board 1. Before you remove hvps board, you should remove: •main cover (see [3-1 main cover]) 2. Remove four screws and a connector from hvps board, then take the board out. 3-7 fuser assembly 1. Before remove fuser assembly, you should remove: • main cover (se...

  • Page 9

    Disassembly and reassembly 3-5 3-8 thermostat and halogen lamp 1. Remove a screw from the fuser assembly and remove the thermostat cover, then remove two screws securing the thermostat. 2. Remove two screws from the fuser assembly, and take the heat roller out. 3. Take the halogen lamp out from the ...

  • Page 10

    Disassembly and reassembly 3-6 3-9 smps board 1. Before you remove the smps board, you should remove: • main cover (see [3-1 main cover]) 2. Remove screws in the order of then remove the shield engine assembly. 3. Unplug connectors from the main board and connec- tors from smps, then remove the smps...

  • Page 11

    Disassembly and reassembly 3-7 3-10 main board and sensor board 1. Before you remove the main board, you should remove: • main cover (see [3-1 main cover]) • smps board (see [3-9 smps board]) 2. Remove two screws from the main board and unplug all of connectors, then remove the board. 3. Release fou...

  • Page 12: 4. Troubleshooting

    Troubleshooting 4-1 4. Troubleshooting 4-1 how to use dcu 4-1-1 dcu setup ......................................Page(4-2) 4-1-2 code ................................................Page(4-2) 4-1-3 self diagnostic mode......................Page(4-3) 4-1-4 self test button ...............................

  • Page 13

    Troubleshooting 4-2 4-1 how to use dcu 4-1-1 dcu setup you can examine the malfunction of the printer. To perform dcu, open the front discharge cover and leave the connect the harness wire(10 pin/4 pin) to the cn10(4 pin) of the main control board. 4-1-2 code connect dcu to the printer and turn the ...

  • Page 14

    Troubleshooting 4-3 4-1-3 self diagnostic mode if error code occurs due to malfunction of the printer, perform self diagnostic mode to solve the problem. The printer works only in the self-test mode to solve the malfunction problem. To enter the self-test mode, turn the power on pressing the buttons...

  • Page 15

    Troubleshooting 4-4 13. Thv(+) trigger. All hv all high voltage output by each hv terminal and lsu and the fan is in operation. In this mode, electronic resistance of transfer roller and high voltage is detected. If no toner cartridge in the printer, output of thv is +199v ~ + 2100v. 14. Ptl test in...

  • Page 16

    Troubleshooting 4-5 4-2 the cause and solution of bad image 4-2-1 vertical black line and band • description 1. Straight thin black vertical line occurs in the printing. 2. Dark black vertical band occur in the printing. Digital printer digital printer digital printer digital printer digital printer...

  • Page 17

    Troubleshooting 4-6 4-2-3 horizontal black band • description 1. Dark or blurry horizontal stripes occur in the printing periodically. (they may not occur periodically.) digital printer digital printer digital printer digital printer digital printer check and cause solution 1. Bad contacts of the vo...

  • Page 18

    Troubleshooting 4-7 4-2-5 light image • description the printed image is light, with no ghost. Digital printer digital printer digital printer digital printer digital printer check and cause solution 1. Develop roller is stained when the toner of developer cartridge is almost con- sumed. 2. Ambient ...

  • Page 19

    Troubleshooting 4-8 4-2-7 uneven density • description print density is uneven between left and right. Check and cause solution 1. The pressure force on the left and right springs of the transfer roller is not even, the springs are damaged, the transfer roller is improperly installed, or the trans- ...

  • Page 20: Digital Printer

    Troubleshooting 4-9 4-2-9 ghost (1) • description ghost occurs at 75 mm intervals of the opc drum in the whole printing. Digital printer digital printer digital printer digital printer digital printer digital printer 75mm check and cause solution 1. Bad contacts caused by contamination from toner pa...

  • Page 21: Digital Printer

    Troubleshooting 4-10 4-2-11 ghost (3) • description white ghost occurs in the black image printing at 32mm intervals. Digital printer digital printer digital printer digital printer digital printer digital printer 32mm check and cause solution 1. The life of the developer may be expired. 2. The abno...

  • Page 22

    Troubleshooting 4-11 4-2-14 satins on back of page • description the back of the page is stained at 47mm intervals. Digital digital pri digital printer digital printer digital printer check and cause solution 1. Transfer roller is contaminated. 2. Pressure roller is contaminated. 1. Perform the opc ...

  • Page 23

    Troubleshooting 4-12 4-3 the cause and solution of the bad discharge 4-3-1 wrong print position • description printing begins at wrong position on the paper. Check and cause solution wrong sense time caused by defective feed sensor actuator. Replace the defective actuator (service parts : figure 8-1...

  • Page 24

    Troubleshooting 4-13 4-3-4 jam 2 • description 1. Recording paper is jammed in front of or inside the fuser. 2. Recording paper is stuck in the discharge roller and in the fuser just after passing through the actuator-feed. Exit 2 exit 1 cartridge cartridge pick up exit sensor feed sen lsu lsu jam 2...

  • Page 25

    Troubleshooting 4-14 4-3-5 multi-feeding • description multiple sheets of paper are fed at once. Check and cause solution 1. Solenoid malfunction(the solenoid does not work properly): perform dcu mode : solenoid check 06. 2. Pad-friction is contaminated with foreign matter.(oil...) 3. The face of pa...

  • Page 26

    Troubleshooting 4-15 4-3-7 opc • description paper is rolled up in the opc. Check and cause solution 1. Paper is too much thin. 2. The face of paper is curled. 1. Recommend to use normal paper. 2. How to remove the rolled paper in the opc. • remove the paper while turning the opc against the ongoing...

  • Page 27

    Troubleshooting 4-16 4-4 the cause and solution of the malfunction 4-4-1 all leds blinking (fuser error) • description 1. All the lamps on the operator panel blink. 2. Gear of the fuser does not work and breaks away melt away. When printing, motor breaks away from its place due to defective fuser ge...

  • Page 28

    Troubleshooting 4-17 4-4-3 not function of the gear of the fuser due to melting away • description the motor breaks away from its place due to gear melting away. Check and cause solution dcu mode : check if the error states '60' '62' '68' occur. Check the operation of fuser erasing lamp on/off with ...

  • Page 29

    Troubleshooting 4-18 4-4-6 cover open • description the error lamp is on even when the print cover is closed. Check and cause solution 1. The hook lever in the top cover may be defective. 2. Check the connector and circuit of the cover switch department in the main control board. Perform dcu mode : ...

  • Page 30

    Troubleshooting 4-19 4-4-9 defective motor operation • description main motor is not driving when printing, and paper does not feed into the printer, resulting 'jam 0'. Check and cause solution 1. Motor harness or sub pcb may be defective. 2. Perform dcu diagnostic code 00 and check the motor operat...

  • Page 31

    Troubleshooting 4-20 4-4-11 vertical line getting curved • description when printing, vertical line gets curved. Check and cause solution 1. If the supply of +24v is unstable in the main control board linking with lsu, check drive by dcu mode: lsu check -05- lsu motor on. 1. Replace lsu. (service pa...

  • Page 32

    Troubleshooting 4-21 4-5 toner cartridge service it is not guaranteed for the default caused by using other toner cartridge other than the cartridge supplied by the samsung electronic or caused by non-licensed refill production. 4-5-1 precautions on safe-keeping of toner cartridge excessive exposure...

  • Page 33

    Troubleshooting 4-22 4-5-3 signs and measures at poor toner cartridge fault signs cause & check solution light image and partially blank image (the life is ended.) toner contamination • the printed image is light or unclean and untidy. • some part of the image is not print- ed. • periodically a nois...

  • Page 34

    Troubleshooting 4-23 fault signs cause & check solution white black spot recycled product • light or dark black dots on the image occur periodically. • white spots occur in the image period- ically. • poor appearance of the developer. • unclean and rough printouts. • bad background in the image. 1. ...

  • Page 35

    Troubleshooting 4-24 fault signs cause & check solution ghost & image contamination • the printed image is too light or dark, or partially contami- nated black. • totally contaminat- edblack. (black image print- ed out) • the density of print- outs is too dark and ghost occurs. 1. The printed image ...

  • Page 36

    Troubleshooting 4-25 4-6 the cause and solutions of bad environment of the software 4-6-1 the printer is not working (1) • description while power turned on, the printer is not working in the printing mode. Check and cause solution 1. Run self-test mode: turn the power on while pressing the test pri...

  • Page 37

    Troubleshooting 4-26 4-6-2 the printer is not working (2) • description after receiving the printing order, no response at all or the low speed of printing occurs due to wrong setup of the environment rather than malfunction of the printer itself. Check and cause solution 1. Secure more space of the...

  • Page 38

    Troubleshooting 4-27 4-6-3 abnormal printing • description the printing is not working properly even when the cable has no problem. (even after the cable is replaced) if the printer won't work at all or the strange fonts are repeated, the printer driver may be defec- tive or wrong setup in the cmos ...

  • Page 39

    Troubleshooting 4-28 4-6-4 spool error • description to spool which stands for "simultaneous peripheral operations online" a computer document or task list (or "job") is to read it in and store it, usually on a hard disk or larger storage medium so that it can be printed or otherwise processed at a ...

  • Page 40

    Exploded views and parts list 5-1 5. Exploded views and parts list • deal drawings and service parts are declared for the items with higher rate of inferiority and replaceable in the level of service description only. • if inferiority occurs, you can replace the parts by the unit declared in deal dr...

  • Page 41

    Exploded views and parts list 5-2 5-1 tatal assembly 11 5 8-13 8-14 13 12 12-1 8 6 7 4 3 8-4-2 8-4-1 8-4 10 9 14 8-17 8-16 8-25 8-29 8-28 8-10 8-15 8-1 1 8-9 8-8 8-7 8-1 8-6 8-3 8-2 8-20 8-21 8-24 8-23 8-22 8-30 8-5 8-27 8-19 8-18 8-26 8-12 1-1 2 1 1-2 1-5 1-6 1-4 1-3.

  • Page 42

    Exploded views and parts list 5-3 o : service available x : service not available no. Description sec.Code q’ty sa remark 1 ela unit-cvr front * 1 x 1-1 pba sub-led panel jc92-01280a 1 o 1-2 pmo-cover front jc63-01281a 1 o phase3110 pmo-cover front jc63-01281b 1 o phase3210 1-3 cbf harness-front pan...

  • Page 43

    Exploded views and parts list 5-4 5-2 front assembly 0 2 10 8 6 1 10 4 5 3 11 7 12 9 no description 0 ela hou-cover front 1 cbf-harness-panel main 2 pmo-cover front 3 pmo-guide stacker 4 pmo-door face up 5 ppr-sheet paper guide 6 pmo-key a 7 pmo-key b 8 pmo-lens sed 9 pmo-cover pcb 10 pmo-stopper 11...

  • Page 44

    Exploded views and parts list 5-5 5-3 engine/frame lower assembly 2-17 2-3-2 2-3-1 2-7 2-7-3 2-7-1 2-7-2 2-9-1 2-9-2 2-9-4 2-9-3 2-8 2-9 2-10 3-3 3-3-1 3-2-3 3-2-1 2-3 2-12 2-15 2-14 2-13 3-2 3-2-2 3-2-3 3-2-1 3-2-4 3-43 3-44 3-12 3-5 3-17 3-6 3-6 3-4 3-15 2-11 1 2-16 2-16-2 2-16-1 3 3-41 3-25 3-16 ...

  • Page 45

    Exploded views and parts list 5-6 5-4 fuser assembly 15 15-2 15-1 14 14-2 14-1 10 17 22 11 18 4 12 2 7 13 9 5 1 8 6 19 3 20 s-1 s-1 s-1 s-2 0 24 30 29 27 26 28 21 24 23 25 17 16 no description 0 ela hou-fuser ass’y 1 thermistor-ntc 2 thermostat-150c 3 lamp-halogen 4 pmo-cover fuser 5 pmo-bushing h/r...

  • Page 46

    Exploded views and parts list 5-7 5-5 shield engine unit assembly 1-2 1 1-1 3 s-1 2 0 s-2 s-3 no description 0 ela hou-shield engine 1 mec-shield brkt controller 1-1 ipr-shield engine 1-2 ipr-brkt controller 2 pct-insulator smps 3 cbf harness-inlet ass’y s-1 screw-machine s-2 screw-taptite s-3 screw...

  • Page 47

    Exploded views and parts list 5-8 5-6 rx drive assembly no description 0 ela hou-rx drive 1 motor-step 2 pmo-gear_71/28 3 pmo-gear_73/22 4 pmo-gear_132/19 5 ipr-brkt_motor 6 ipr-brkt_gear 7 cbf-harness_motor s-7 screw-machine 5-7 plate-upper unit assembly 0 6 4 4-1 4-2 4-3 2 2 3-1 3-2 3-3 3-3 3 4 4-...

  • Page 48: 6. Block Diagram

    Block diagram 6-1 6. Block diagram 6-1. Block diagram(gdi) main s3c46m0x sdram ( 8mb) smps engine panel b' d flash memory ( 0 .5mb) power cord +24v motor fan exi t sensor hvps b' d mhv opc gnd supply dev th v buffer mhvpwm biaspwm thvpwm power swi tch i n-let led 4 3 key ieee 1284 cable vol tage det...

  • Page 49

    Block diagram 6-2 6-2. Block diagram(pcl) main s option up to 68mb dram ( 4 (2mb) mb) lsu engine panel b' d flash memory power cord +24v motor solenoid fan exit sensor hvps b' d mhv opc gnd supply dev th v mhvpwm biaspwm thvpwm power switch led 4 3 key ieee 1284 cable oscillator 48 mhz usb pc dev_fu...

  • Page 50: 7. Connection Diagram

    Connection diagram 7-1 7. Connection diagram 7-1. Connection diagram(gdi) 1 2 3 4 5 6 7 8 9 10 11 1 2 3 4 5 1 2 3 4 5 6 +24v_t +24v gnd *pmotor +3. 3v ext_c lk * hsync +5v +5v gnd * ld_on vdo +5v gnd lsu polygon motor ld diode +5v +5v gnd led_error led_paper led_data led_toner * key_toner * key_canc...

  • Page 51

    Connection diagram 7-2 7-2. Connection diagram(pcl) 1 2 3 4 5 6 7 8 9 10 11 +24v_sleep +24v gnd * p lready* motor ext_c lk * hsync +5v +5v gnd * ld_on vdo +5v gnd lsu polygon motor ld diode +5v +5v gnd key_toner* key_cancel* key_demo* 1 2 3 4 5 6 7 8 9 led display panel 1 2 3 4 5 6 7 8 9 +5v ptl ptl...

  • Page 52: 8. Electrical Parts List

    0105-001032 2 paper-art “75g,w210,-,white,hansoi,l297” 0401-000116 d1 1 diode-switching “mmsd914t1,100v,200ma,sod-123,tp” 0401-000116 d13 1 diode-switching “mmsd914t1,100v,200ma,sod-123,tp” 0404-000112 d6 1 diode-schottky “rb420d,25v,100ma,sot-23,tp” 0407-000101 “d14,d15,d16,d17,d18” 5 diode-array “...

  • Page 53

    Electrical parts list 8-2 2007-000090 r37 1 r-chip “10kohm,5%,1/16w,da,tp,1608” 2007-000090 r42 1 r-chip “10kohm,5%,1/16w,da,tp,1608” 2007-000090 r43 1 r-chip “10kohm,5%,1/16w,da,tp,1608” 2007-000090 r44 1 r-chip “10kohm,5%,1/16w,da,tp,1608” 2007-000090 r56 1 r-chip “10kohm,5%,1/16w,da,tp,1608” 2007...

  • Page 54

    Electrical parts list 8-3 2203-000192 “c96,c89” 2 “c-ceramic,chip” “100nf,+80-20%,50v,y5v,tp,2012,” 2203-000236 “c134,c188,c192,c194” 4 “c-ceramic,chip” “0.1nf,5%,50v,np0,tp,1608” 2203-000236 “c154,c156,c157,c158” 4 “c-ceramic,chip” “0.1nf,5%,50v,np0,tp,1608” 2203-000257 “c102,c146” 2 “c-ceramic,chi...

  • Page 55

    Electrical parts list 8-4 jc92-01333a 1 pba main-pcl “ml-1250,sec,world wide,pcl,12ppm,” 0105-001032 2 paper-art “75g,w210,-,white,hansoi,l297” 0401-000116 d4 1 diode-switching “mmsd914t1,100v,200ma,sod-123,tp” 0401-000116 d8 1 diode-switching “mmsd914t1,100v,200ma,sod-123,tp” 0404-000112 d1 1 diode...

  • Page 56

    Electrical parts list 8-5 2007-000078 r89 1 r-chip “1kohm,5%,1/16w,da,tp,1608” 2007-000078 r90 1 r-chip “1kohm,5%,1/16w,da,tp,1608” 2007-000084 r68 1 r-chip “4.7kohm,5%,1/16w,da,tp,1608” 2007-000086 r65 1 r-chip “5.6kohm,5%,1/16w,da,tp,1608” 2007-000086 r67 1 r-chip “5.6kohm,5%,1/16w,da,tp,1608” 200...

  • Page 57

    Electrical parts list 8-6 2011-001334 u4 1 rc-network “1k/5.1k/39ohm,10%,150pf,-,6v,28p” 2203-000189 c100 1 “c-ceramic,chip” “100nf,+80-20%,25v,y5v,tp,1608,” 2203-000189 c101 1 “c-ceramic,chip” “100nf,+80-20%,25v,y5v,tp,1608,” 2203-000189 c105 1 “c-ceramic,chip” “100nf,+80-20%,25v,y5v,tp,1608,” 2203...

  • Page 58

    Electrical parts list 8-7 2203-000189 c83 1 “c-ceramic,chip” “100nf,+80-20%,25v,y5v,tp,1608,” 2203-000189 c84 1 “c-ceramic,chip” “100nf,+80-20%,25v,y5v,tp,1608,” 2203-000189 c86 1 “c-ceramic,chip” “100nf,+80-20%,25v,y5v,tp,1608,” 2203-000189 c87 1 “c-ceramic,chip” “100nf,+80-20%,25v,y5v,tp,1608,” 22...

  • Page 59

    Electrical parts list 8-8 2203-000440 c39 1 “c-ceramic,chip” “1nf,10%,50v,x7r,tp,1608,-” 2203-000440 c40 1 “c-ceramic,chip” “1nf,10%,50v,x7r,tp,1608,-” 2203-000440 c46 1 “c-ceramic,chip” “1nf,10%,50v,x7r,tp,1608,-” 2203-000440 c47 1 “c-ceramic,chip” “1nf,10%,50v,x7r,tp,1608,-” 2203-000440 c52 1 “c-c...

  • Page 60

    Electrical parts list 8-9 3301-000317 b4 1 core-ferrite bead “ab,2x1.25x0.9mm,-,-” 3301-000344 bd1 1 core-ferrite bead “aa,-,3.5x0.6x6.5mm,-,-,mn-zn,-” 3301-001069 l1 1 core-ferrite bead “ab,1.6x0.8x0.8mm,-,-” 3301-001069 l2 1 core-ferrite bead “ab,1.6x0.8x0.8mm,-,-” 3301-001069 l3 1 core-ferrite be...

  • Page 61

    Schematic diagrams 9-1 9-1 gdi main circuit diagram(1/5) 9. Schematic diagrams.

  • Page 62

    Schematic diagrams 9-2 gdi main circuit diagram(2/5).

  • Page 63

    Schematic diagrams 9-3 gdi main circuit diagram(3/5).

  • Page 64

    Schematic diagrams 9-4 gdi main circuit diagram(4/5).

  • Page 65

    Schematic diagrams 9-5 gdi main circuit diagram(5/5).

  • Page 66

    Schematic diagrams 9-6 9-2 pcl main circuit diagram(1/9).

  • Page 67

    Schematic diagrams 9-7 pcl main circuit diagram(2/9).

  • Page 68

    Schematic diagrams 9-8 pcl main circuit diagram(3/9).

  • Page 69

    Schematic diagrams 9-9 pcl main circuit diagram(4/9).

  • Page 70

    Schematic diagrams 9-10 pcl main circuit diagram(5/9).

  • Page 71

    Schematic diagrams 9-11 pcl main circuit diagram(6/9).

  • Page 72

    Schematic diagrams 9-12 pcl main circuit diagram(7/9).

  • Page 73

    Schematic diagrams 9-13 pcl main circuit diagram(8/9).

  • Page 74

    Schematic diagrams 9-14 pcl main circuit diagram(9/9).

  • Page 75

    Schematic diagrams 9-15 9-3 panel circuit diagram.

  • Page 76

    Schematic diagrams 9-16 9-4 hvps circuit diagram(1/2) 5v 18v 24vs 24vs 18v 24vs 5v cn1-#6 u2-b cn1-#7 u2-a in gnd out u3 ka7818 7407 7407 r422 5.6k r411 2.2k r401 100 q401 a708-y r412 2k r403 110kf vr401 50k r402 56kf c408 104 c401 222 r405 220kf r406 2.2kf c402 103 r407 240k r408 47k r409 430 c403 ...

  • Page 77

    Schematic diagrams 9-17 hvps circuit diagram(2/2) 5v 18v 24vs 18v 18v 18v 24vs 24vs d-gnd cn1-#5 cn1-#4 cn1-#8 cn1-#3 7407 u2-f u2-e 7407 7407 r205 1k r206 100 q203 a708-y r207 2k r208 30kf r209 110kf vr201 50k c201 103 c202 331 r210 510kf d202 1n4148 d201 1n4148 r211 1mf r212 470k c203 472 d203 1n4...

  • Page 78

    Schematic diagrams 9-18 9-5 smps circuit diagram(100v) +24v 1.8a +5v 1.0a gnd no marking resistor 1/4w-j (5%) 1 3 5 6 11 10 7 12 gnd cn5-14 cn5-13,15 cn5-16 eer2828 +5v +24vs gnd gnd 1 2 17 4 9 6 3 18 15 5 16 12 7 14 8 13 1a 1b 2a 2b phase1 +enable1 rc1 sense1 e1 vref gnd e2 sense2 rc2 vcc vbb u1 a2...

  • Page 79

    Schematic diagrams 9-19 smps circuit diagram(200v) +24v 1.8a +5v 1.0a gnd no marking resistor 1/4w-j (5%) 1 3 5 6 11 10 7 12 gnd cn5-14 cn5-13,15 cn5-16 eer2828 +5v +24vs gnd gnd 1 2 17 4 9 6 3 18 15 5 16 12 7 14 8 13 1a 1b 2a 2b phase1 +enable1 rc1 sense1 e1 vref gnd e2 sense2 rc2 vcc vbb u1 a2918s...