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OKIPAGE 8cn Led Printer

1. NMQ3C66N NW CPU BUS VIDEO L E V VIDEO MEM HM658512 JSC 28MHz LSI 1T3PFV HESET GENERAL PORT Engine Control Board Block Diagram containing AD converter arola A gt Y HEAD UF 3 3V gt M HEAD 3 3V C HEAD VF 3 3v gt BHEAD UF 3 3V MT DRIVER MTD2005F MT DRIVER MTLD2ODSF MT DRIVER MTLDZODSF PULSE MOTOR x 8 8 gt HIGH VOLTAGE POWER SUPPLY SERIAL INTERFACE 2 channals h LN GENERAL OUTPUT PORT engine control block is controlled by the engine control board PX4 PCB which consists of a CPU MSM65524 general purpose LSI chips EPROM EEPROM pulse motor drivers and video memory Refer to the Engine Control Board Block Diagram 1 2 3 4 5 6 This is 8 bit CPU OKI MSM65524 containing the AD converter and controls the whole system General purpose LSI This LSI MB87D113PFV is provided in the printer engine control block and has controller engine video interface LED interface motor control sensor input video memory control main scanning color correction skew correction high voltage power control and OST EX2 functions EPROM This EPROM 275C512 150 has a storage capacity of 512K bits and stores programs for the PU block EEPROM This EEPROM NM93C66N NW has a storage capacity of 4K bits It is mounted on the board by means
2. we the holder inlet 3 by unscrewing 2 screws 2 then remove the power switch 4 and unplug the AC socket 5 5 Draw the power supply unit 7 by unscrewing 2 screws 6 then unplug the cable 8 Figure 3 3 16 Power Supply Unit Holder Inlet Sheet Insulation 7 40018901 Power Unit ACDC Switching 120V 8 2 485 40019001 Power Unit Switching 230V RSPL 8 2 5 Copyright 1998 Okidata Division of OKI America Inc All rights reserved See the OKIDATA Business Partner Exchange BPX for any updates to this material http bpx okidata com 44 Ok a Service Guide OKIPAGE 8c Chapter 3 Disassembly 3 3 17 Sensor Assy Box Toner 1 Remove the power supper unit See 3 3 16 2 Unscrew the screw 1 then remove the sensor assy box toner 2 together with the bracket 93 3 Unscrew the screw 4 then remove the sensor assy box toner 2 14 Figure 3 3 17 Sensor Assy Box Toner 2 40450401 Sensor Assy Toner RSPL 3 140450201 Bracket Switch RSPL 8 3 Item 47 Copyright 1998 Okidata Division of OKI America Inc All rights reserved See the OKIDATA Business Partner Exchange BPX for any updates to this material http opx okidata com 45 Ok a Service Guide OKIPAGE 8c Chapter 3 Disassembly 3 3 18 Square shaped Connector 1 Remove the power supply unit See 3 3 16 Do not remo
3. 7 Power consumption 8 Frequency 9 Noises 10 Expendables and service life 11 Periodically replaced parts Width 18 8 Approx 91 Ibs without box Ordinary paper Hammermill xx and Transparency Only CG3710 paper for color printing Note the printout color tones are dependent upon the whiteness of the print paper Letter Legal 13 or 14 Executive A4 A5 B5 and B6 1st tray and front feeder 1st tray 20 lbs to 28 lbs 2nd tray 20 lbs to 28 Ibs Front feeder 20 165 to 44 Ibs 8 pages per minute 5 pages per minute Transparency 34 Ib 44 Ib 1239 166g m 600 dots per inch x 600 dots per inch 120VAC 5 5 15 230VAC to 240VAC 10 14 Peak Approx 980W Typical operation Approx 230W Idle Approx 70W Power save mode Approx 32W 50Hz or 60Hz 296 2 Operating 54 decibels without 2nd tray 55 decibels with 2nd tray Standby 45 decibels Power saving 43 decibels Toner Cartridge Approx 1800 pages 596 density each of Y M C and K Image Drum Up to 12 000 pages 5 density continuous each of Y M C and K Waste Toner Box Up to 25 000 sheets under typical printout conditions Single images of 5 density equivalent to printout using 14 toner cartridges Oil Roller Unit Up to 10 000 sheets Life defined in the number of actual printed paper sheets Note Y Yellow K Black Fuser Heat Un
4. xaua m FA t3 a A gt prisu euo gi ie Addins sieppaa GS EOWSH dPloOY 3H dEL dol del MOOD del MOdN Adds dhi HAH dPLOQNN 03A Jet Est 4 A dugbatexper Pe P 9 puua Byes CULE Duc GN 18 Functional Block Diagram Copyright 1998 Okidata Division of OKI America Inc All rights reserved See the OKIDATA Business Partner Exchange BPX for any updates to this material http bpx okidata com Page 8 Ok a Service Guide OKIPAGE 8c Chapter 2 Operation 2 1 Main Control Board PCR PCB The control board consists of a CPU NR4700 block a memory control LSI block an interface control LSI block a DRAM block an EEPROM block a mask ROM block and an interface block Here is the Functional Block Diagram of the main control board PCR PCB Memory controller ROM Flash 32M 22 SysAD 54 Cono E RN uPD94704 D HAM Max 80M 64 NR4700 100 __ WDATA 1 IESYNC 4 Control SysAD Operator SysCmd 4 panel Ses SSS ee me ee Contral ExtReq EEPD EEPCS1 uPUBG044 Not installed GN 014 LMU ___Extermal Agent 74 1284 Control INT REQ OSC Reset circuit DIP
5. OK A Service Guide OKIPAGE 8c Chapter 0 Introduction Front Cover OKIDATA Service Guide OKIPAGE 8c OKIPAGE 8cn LED PAGE COLOR PRINTER PRODUCTS Adobe Acrobat printable reference copy of the OKIDATA Service Training Manual 11 02 98 Rev 2 0 Note This Adobe Acrobat version of the Okidata Service Training Manual was built with the pictures rendered at 72 dpi which is ideal for screen viewing For future updates to this manual and more on line information visit our Business Partner Exchange BPX at http bpx okidata com Table of Contents Page Service Guide OKIPAGE 8c 0 Introduction Preface 2 1 Specifications 1 1 Basic System Configuration 3 1 2 Printer Specifications 4 1 3 Option Specifications D 1 4 Basic Specifications 6 2 Operation 2 Operation 7 2 1 Main Control Board PCR PCB 8 2 2 Engine Control Board PX4 PCB 9 2 3 Power Board 10 2 4 Mechanical Processes 11 2 4 1 Electrophotographic processing mechanism 12 2 4 2 Paper running process 13 2 5 Sensors 14 2 5 1 Paper Related Sensors 15 2 5 2 Other sensors 16 2 6 Correction of Color Deviation 17 2 7 Transfer Control according to Environmental Changes 18 2 8 Form Jam Detection 19 2 9 Cover Opening 20 2 10 Toner Lower Detection 21 2 11 Page Size Detection 22 2 12 Power on Processing 23 3 Disassembly 3 0 Parts Replacement 24 3 1 Precautions for Parts Replacement 25 3 2 Parts Layout 26 3 3 How to Change Parts 27 3 3 1 Cover Ass
6. Chapter 3 Disassembly 3 0 Parts Replacement 3 1 Precautions for Parts Replacement 3 2 Parts Layout 3 3 How to Change Parts Copyright 1998 Okidata Division of OKI America Inc All rights reserved See the OKIDATA Business Partner Exchange BPX for any updates to this material http opx okidata com 25 Ok a Service Guide OKIPAGE 8c Chapter 3 Disassembly 3 1 Precautions for Parts Replacement 1 Before starting parts replacement remove the AC cable and interface cable a Removing the AC cable i Turn off o the power switch of the printer ii Disconnect the AC inlet plug of the AC cable from the AC receptacle iii Disconnect the AC cable and interface cable from the printer b Reconnecting the AC cable i Connect the AC cable and interface cable to the printer ii Connect the AC inlet plug to the AC receptacle iii Turn on 1 the power switch of the printer gt 2 Disconnect 2 Do not disassemble the printer if operating normally 3 Do not remove unnecessary parts try to keep disassembly to a minimum 4 Use specified service tools 5 When disassembling follow the determined sequence Otherwise parts may be damaged 6 Since screws collars and other small parts are likely to be lost they should temporarily be attached to the original positions 7 When handling ICs such as microprocessors ROM and RAM and circuit boards follow standard electrostatic proce
7. http opx okidata com 14 Service Guide OKIPAGE 8c Chapter 2 Operation 2 5 Sensors 2 5 1 Paper related sensors 2 5 2 Other sensors Copyright 1998 Okidata Division of OKI America Inc All rights reserved See the OKIDATA Business Partner Exchange BPX for any updates to this material http opx okidata com 15 Ok a Service Guide OKIPAGE 8c Chapter 2 Operation 2 5 1 Paper Related Sensors Qu Fjection raller a Y drum Write sensor FF hopping roller K drum drum M drum Heat raller Pickup raller Finch roller 2 Exit sensor Y 4 A Farm width sensor 4 i f roller 1 Resist roller 1 Backup roller esist roller om i y Resist roller 2 J FF sensor 1 Belt cleaning blade Conveying bell FF sensor 2 M First hopping roller A Auxiliary rollers Second hopping roller FF sensor 1 2 Detects the front edge of an incoming paper ON Front edge detected Entrance sensor 1 2 determines timing to change from OFF Front edge not detected hopping to conveying Write sensor Detects the front edge of the conveyed ON Form present paper sheet and determines the length of the OFF Form absent paper sheet from elapsed time before the front edge of the paper reaches the sensor Ejection sensor Detects the front and rear edges of a paper Form present sheet and determines whether the paper 5 OFF Form e
8. Copyright 1998 Okidata Division of OKI America Inc All rights reserved See the OKIDATA Business Partner Exchange BPX for any updates to this material http bpx okidata com 40 Ok a Service Guide OKIPAGE 8c Chapter 3 Disassembly 3 3 13 Main Motor A B Assy Hemove the PXF PCB and PX4 PCB See 3 3 11 the 4 screws 8 and remove 4 plate Earth 9 and 4 lever Up Dn 2 1 Detach the all the cables 2 connected and unscrew 4 screws 3 then remove the main motor A assy 4 Detach the all the cables 5 connected and unscrew 3 screws 6 then remove the main motor B assy 7 Figure 3 3 13 Main Motor A B Assy 1 8 5 6 8 5 4 1 40664501 Lever Up Dn 2 8 5 41 Copyright 1998 Okidata Division of OKI America Inc All rights reserved See the OKIDATA Business Partner Exchange BPX for any updates to this material http bpx okidata com Page 41 Ok a Service Guide OKIPAGE 8c Chapter 3 Disassembly 3 3 14 Gear One way Z30 Four gear one ways 230 are provided but the method of those replacements is the same Do not disassemble the gear one ways 730 because they are assemblies which require adjustment Remove the PCB assy PCM See 3 3 9 Remove the cover CU See 3 3 11 Remove the 4 Plate Earth and 4 lever Up Dn 2 See 3 3 13 9 ge Release the lock with the shaft by spreading the cla
9. KV 50 Voltage applied to charging roller NEN Normal paper Voltage applied to developing roller Y M C K 250V 300V 232V 300V First paper Y only K 270V 300V Transparency Y M C 200V 300V K 250V 300V NEN Y M C K 650V 0V Voltage applied to toner roller roller Copyright 1998 Okidata Division of America Inc All rights reserved See the OKIDATA Business Partner Exchange BPX for any updates to this material http opx okidata com Page 11 Service Guide OKIPAGE 8c Chapter 2 Operation 2 4 Mechanical Processes Here is the Mechanical Process Diagram of OKIPAGE 8c oo jo udgejng Jaded Way Burddou BuilaAuaa adeg dnyad sadeg 5 08 1 Gum uogaala Jade 151 ddl jala 2819 g Jelo 18101 Aiding buiddopi ESH 5 105099 Bless nr pag 151881 y pa XV V RCRA um qm j Jaded ia Madea uad 205095 woy 2208095 paa uo d apa FRANE AMAN NE NEN NM KNEE NM euo 3 ao pled ng q 19001 105095 uogaala Jaded Ards m o p 1 DuiBieu Wo oW A peay q31 PE mee ERR umop eng jeus 007 JJa uoe 19024 Mechanical Process Diagram Figure 2 5 Copyright 1998 Okidata Division of OKI America Inc All rights rese
10. Limiter 2way L R Plate Guide L R 1 Remove the plate support assy L and See 3 3 6 2 Unscrew 2 screws 1 then remove the limiter 2way L 2 and the plate guide L 3 3 Unscrew 2 screws 4 then remove limiter 2way 5 and the plate guide 6 Figure 3 3 7 Limiter 2way L R Plate guide L R 40383701 Limiter 2 way L RSPL 8 3 15 40335001 Plate Guard L RSPL 8 3 Item 17 40383801 Limiter 2 way R RSPL 8 3 Item 16 40335101 Plate Guard RSPL 8 3 Item 18 Copyright 1998 Okidata Division of OKI America Inc All rights reserved See the OKIDATA Business Partner Exchange BPX for any updates to this material http bpx okidata com 35 Ok a Service Guide OKIPAGE 8c Chapter 3 Disassembly 3 3 8 Cover Describes the method of removing the cover assy side L R cover assy OP panel cover front L R and the cover rear L 1 Remove the cover assy rear See 3 3 1 2 Remove the cover assy stacker See 3 3 4 3 Remove the 2 screws 1 then remove the frame side L 2 4 Remove the 2 screws 3 then release the lock of the claw with the cover assy side R 4 lifted a little bit then remove the cover assy side R 5 Detach the operator panel cable 5 from the PCM PCB 6 Open the FDR unit front in the arrow direction 7 Remove the 2 screws 6 then remove the cover assy OP panel 7 8 Remove the 2 screws 8 with
11. OKI America Inc All rights reserved See the OKIDATA Business Partner Exchange BPX for any updates to this material http opx okidata com 51 Ok a Service Guide OKIPAGE 8c Chapter 3 Disassembly 3 3 24 Two Lever Input Sensors Lever 2nd Feed Sensor 1 Remove the guide paper input assy See 3 3 23 2 Release the engagement with the guide 3 by pressing the lever input sensors 1 in the arrow direction then remove them 3 Release the engagement with the guide by pressing the lever 2nd feed sensor 2 in the arrow direction then remove the sensor Figure 3 3 24 Two Lever Input Sensors Lever 2nd Feed Sensor 40303301 Paper Input Assy 7 8 3 24 ndude 3 40097301 Paper Input RSPL 8 3 43 40144301 Lever Input Sensor RSPL 18 3 44 40144401 Lever 2nd Feed Sensor RSPL 8 3 45 Copyright 1998 Okidata Division of OKI America Inc All rights reserved See the OKIDATA Business Partner Exchange BPX for any updates to this material http opx okidata com 52 Ok a Service Guide OKIPAGE 8c Chapter 3 Disassembly 3 3 25 Roller Registration Roller Assy Hopping 1 gs 3 4 Remove the guide paper input assy See 3 3 23 Remove the bracket hopping motor See 3 3 19 Remove the gear one way See 3 3 20 Hemove the holder gear toner assy See 3 3 30 Removal of the roller registrati
12. This process fits paper to the surface of the image drum and applies positive charge opposite to the charge of the toner to the back side of the paper from the transfer roller The toner image is transferred to the paper 6 Cleaning Cleaning blade scrapes off the remaining toner of any image drum which has been used to transfer the image drum the drum to the paper 7 Fixing This process fixes the toner image on the paper by pressing the fusing the image Paper pickup Pickup raler Paper medium Corweying bell 4 Canveying bell gt Driven roller DC voltage 0V to 2KV is applied to the driven roller A to create a positive charge on the lower surface of the paper The kept in charged paper is electrostatically attracted to the pickup roller The paper is in close contact with the conveying Belt and moves steadily 3 Charging This process applies a DC voltage to the charging roller in contact with the surface of the image drum Charging roler 4 Exposure The light beams from the LED head are applied to the surface of the image drum which is charged negatively The negative charge on the illuminated surface f the image drum is reduced according to the magnitude of the light beams and a latent image is formed on the surface of the image drum according to the resulting surface potentials LED haad Charging roller we LED head Supply uu s 5 Developing This p
13. Unscrew 5 screws 1 then remove the cover CU2 3 Unplug all the cables 5 connected to the PXF PCB 3 and PX4 PCB 4 4 Unscrew 5 screws 6 then remove the PXF PCB3 and PX4 PCB4 at the same time Figure 3 3 11 PXF PCB PXS PCB Copyright 1998 Okidata Division of OKI America Inc All rights reserved See the OKIDATA Business Partner Exchange BPX for any updates to this material http opx okidata com 39 Ok a Service Guide OKIPAGE 8c Chapter 3 Disassembly 3 3 12 Gear Heat Assy Q9 WE X Remove the cover assy side cover assy OP panel cover front R and the cover rear L See 3 3 8 Remove the cover CU then unplug all the cables connected to the PX4 PCB and unscrew 3 screws See 3 3 11 Unplug all the cables connected to the PXF PCB then remove the PX4 PCB See 3 3 11 Be careful not to damage the connector when unplugging cables connected to the PXF PCB Remove the heat unit assy See 3 3 40 Remove the guide paper eject assy See 3 3 3 Remove the motor fan 80 25 See 3 3 2 Remove the 5 screws 1 and detach the cable 2 then remove the guide heat assy 3 Remove the 2 screws 4 then remove the motor ID 5 e Figure 3 3 12 Gear Heat Assy 40310001 Gear Heat Assy RSPL 8 5 1 ndudes eee 140124101 Motor Pulse ID RSPL 8 5 11 40448901 Heat Mech Assy RSPL 8 5 40 8 5 11 5 140124101 Motor Pulse ID RSPL
14. claws of the gear one way 91 92 and 3 then remove the gear one ways Figure 3 3 20 Gear One way 4 140686701 Register Gear RSPL 8 3 67 1 140164301 One way 248 RSPL 8 3 31 2 40164501 One way 248 48 RSPL 8 3 30 3 140250901 One way 96 RSPL 8 3 29 Copyright 1998 Okidata Division of OKI America Inc All rights reserved See the OKIDATA Business Partner Exchange BPX for any updates to this material http bpx okidata com 48 Ok a Service Guide OKIPAGE 8c Chapter 3 Disassembly 3 3 21 Feeder Unit Front 1 Remove the cover assy side R cover assy OP panel cover front R and the cover front L See 3 3 8 Remove the cover CU See 3 3 11 Unplug the cable 1 and unscrew the screw 2 then remove the bracket FF shaft 3 Remove 2 E rings 4 then remove the feeder unit front 5 Unscrew each 2 screws 6 then remove 2 bracket FF links 7 Figure 3 3 21 Feeder Unit Front 1 140641801 Cord Wire RSPL 8 2 29 3 140193601 Bracket FF Link RSPL 8 2 7 5 140311201 FDR Unit Front RSPL 8 2 6 includes ff 1414000 55700401 2PA4128 1076G001 Hopper Manual 8 2 26 Feed Assy 40449001 FDR Unit Main Assy RSPL 8 2 27 7 40193501 Plate FF Link RSPL 8 2 7 Copyright 1998 Okidata Division of OKI America Inc All right
15. resist roller 1 This operation corrections any paper skew Resist roller 2 j One way gear C i Resist roller 1 de gear C One way gear B P d cm a E Idle gear A a Idle gear B d a a a First hopping roller Pulse molor One way gear A b Conveying 1 After paper hopping is completed the pulse motor turns right in the direction of b to drive the resist rollers 1 and 2 The resist rollers feed the paper until the Form sensor turns on Although the one way gear A is also driven the hopping roller does not turn because of the one way clutch 2 The paper is further fed in synchronism with the print data Hesist roller 2 f One way gear C Hesist roller 1 Idle gear C One way gear B Idle gear Idle gear B Pd First hopping roller Pulse motor 4 One way gear A 2 The hopping operation of the front feeder and the up down operation of the pinch roller 2 are performed by a single pulse motor Cam One way clutch gear B Idle gear A Sensor position Hopping roller Am Uprdown Pinch roller One way clutch gear A Idle gear B Form sensor Entrance sensor Resist roller 2 When the pulse motor of the front feeder turns right in the direction of A the front hopping roller turns left in the direction of b to drive the cam This cam moves up an down the pinch roller 2 The one way clutch gears are made to turn only in a
16. the cover front R 9 pushed up then release the lock of the claw then remove the cover front R 9 Remove the 2 screws 10 then remove the cover front L 11 10 Remove the 2 screws 12 then remove the cover rear L 13 11 Pull off the film 15 glued on the cassette guide 12 Release the engagement with the guide by lifting the cover assy side L 14 then remove the cover assy side L Pushed Up FDR Unit Front Figure 3 3 8 Cover 40492801 Sub Assy RSPL 8 411 4038 7200 PCOPCB 5 8 2 156636205 12381005 0051 11 40098201 Cover Front L 8 12 7 7 jRSPL 8 4 OO m 6 440 1056 1 20624 fames 00 00 0000 Frame Side Copyright 1998 Okidata Division of OKI America Inc All rights reserved See the OKIDATA Business Partner Exchange BPX for any updates to this material http opx okidata com Page 36 Ok a Service Guide OKIPAGE 8c Chapter 3 Disassembly 3 3 9 PCR PCB Assy 1 Open the top cover 2 Remove the 2 screws 1 and release the lock of the claw by lifting the cover assy side R 2 a little bit then remove the cover assy side R Remove the 2 screws 8 to remove the plate shield CU 9 Remove the 3 screws 3 to remove the plate sealed 4 Detach the operator panel cable 5 from the PCR PCB P
17. then remove Guide Holder 7 by releasing the clamp of the claw or wr S X gw Unscrew 4 screws 8 then remove the Upper Frame Assy 9 Cable is pushed against sharp edge hole down to LED head Figure 3 3 5 Upper Frame Assy 40410701 Frame Upper Assembly RSPL 40187801 Guide Holder RSPL Copyright 1998 Okidata Division of OKI America Inc All rights reserved See the OKIDATA Business Partner Exchange BPX for any updates to this material http bpx okidata com 33 Ok a Service Guide OKIPAGE 8c Chapter 3 Disassembly 3 3 6 Plate Support Assemblies The plate support assemblies are provided right and left The method of those replacements is the same 1 Remove the heat unit assy See 3 3 40 Remove the cover assy rear See 3 3 1 Remove the cover assy stacker See 3 3 4 Remove the frame assy upper See 3 3 5 Detach the cable from the flat cable clip 1 by releasing the lock Pak wD Remove the 2 screws 2 then remove the plate support assy 3 Be careful not to lose the spring 4 which is removed with the plate support assy 3 Figure 3 3 6 Plate Support Assy RSPL 46 40197401 Torsion Spring A Copyright 1998 Okidata Division of OKI America Inc All rights reserved See the OKIDATA Business Partner Exchange BPX for any updates to this material http opx okidata com 34 Ok a Service Guide OKIPAGE 8c Chapter 3 Disassembly 3 3 7
18. 37 9 2 Layout 138 6 PARTS LIST 139 High Capacity Second Paper Feeder 140 2 Tray Assembly 141 Page 2 Ok a Service Guide OKIPAGE 8c Chapter 0 Introduction Preface This manual provides procedures and techniques for the troubleshooting maintenance and repair of OKIPAGE 8c This manual is written for maintenance personnel but it should always be accompanied with the OKIPAGE 8c User s Manual for procedures for handling and operating OKIPAGE 8c For repairing each component of OKIPAGE 8c see the Troubleshooting Manual Notices The contents of this manual are subject to change without prior notice Although reasonable efforts have been taken in the preparation of this manual to assure its accuracy this manual may still contain some errors and omissions OKI will not be liable for any damage caused or alleged to be caused by the customer or any other person using this maintenance manual to repair modify or alter OKIPAGE 8c in any manner Warning Many parts of OKIPAGE 8c are very sensitive and can be easily damaged by improper servicing We strongly suggest that OKIPAGE 8c be serviced by authorized technical service engineers Copyright 1998 Okidata Division of OKI America Inc All rights reserved See the OKIDATA Business Partner Exchange BPX for any updates to this material http opx okidata com Page 3 OKI Service Guide OKIPAGE 8c Chapter 1 Specifications 1 1 Basi
19. CR PCB requires ten 10 screws for removal 6 Remove the 7 screws 6 to remove the PCR PCB 7 5950 Ue AV xy 9 Wo Z TET e Figure 3 3 9 PCB Assy PCM 40315001 Cover Assy Side RSPL 8 1 6 Cover Side Frame Side R 40704901 Plate Shield CU RSPL 8 5 43 7 40604802 PCR PCB JRSPL 65 5 Copyright 1998 Okidata Division of America Inc All rights reserved See the OKIDATA Business Partner Exchange BPX for any updates to this material http opx okidata com 37 Ok a Service Guide OKIPAGE 8c Chapter 3 Disassembly 3 3 10 Motor Fan 1 Open the top cover 2 Remove the cover assy side R frame side L cover assy OP panel and the cover front R See 3 3 8 3 Unplug the cable 1 and unscrew 2 screws 2 2 collars 4 and then remove the motor fan 3 Figure 3 3 10 Motor Fan 2 54122225 PSW2W3 253 Screw 18 5 18 40197101 _ RSPL _ 8 5 17 Copyright 1998 Okidata Division of OKI America Inc All rights reserved See the OKIDATA Business Partner Exchange BPX for any updates to this material http bpx okidata com Page 38 Ok a Service Guide OKIPAGE 8c Chapter 3 Disassembly 3 3 11 PXF PCB PX4 PCB Since the PXF PCB and PX4 PCB are connected with each other via the connector remove them at the same time 1 Remove the PCB assy PCM See 3 3 9 2
20. Jamod abeyor moy aq asuen Ajddns amod uiu yaq ajja Iso q Jasny re sibel yaq 1ajsueg Jala 2 Io uauid dn 28101 1101 Burugar sayjou A g l pEBH 13 1 183285 1 Paper hopping and transfer up down movement of pinch roller 2 Paper is hopped and delivered by the mechanism shown below This mechanism is driven by a single pulse motor Hesist roller 2 One way gear C Hesist roller 1 Idle gear C One way gear B Idle gear Idle gear First hopping roller Pulse motor One way gear The pulse motor turns in the arrow direction a and drives the hopping roller in the direction of b The hopping roller drives the resist roller Gears A B and C have one way clutches to prevent the roller form rotating reversely a Hopping 1 The pulse motor turns in the arrow direction of a counterclockwise and drives the hopping roller to move the paper until the Entrance sensor turns on Although the one way gears B and C are driven the resist roller 2 does no turn The reverse rotations of the one way clutch gears are not transmitted to the resist roller 2 After the Entrance sensor turns on the hopping roller keeps on feeding the paper until it hits the
21. Remove the contact BL L assy and contact CL L assy See 3 3 37 Hemove the hopping motor See 3 3 19 Remove the motor assy BT See 3 3 15 Remove the gear heat assy See 3 3 12 Remove the roller assy hopping See 3 3 25 Remove the holder gear toner assy See 3 3 30 Remove the high voltage power supply unit See 3 3 33 Unplug the inlet AC See 3 3 16 Unscrew 9 screws 1 then remove the guide cassettes L 2 and R 3 together 1 AR Unscrew the screw 4 then remove the switch 5 Unscrew the screw 6 then remove the PXC PCB 7 m 40302901 Guide Cassette R Assy RSPL 18 3 61 8 7 1 50928901 4PP4076 5306P001 Spring Detector RSPL 8 7 2 40368301 RSPL 8 7 5 Copyright 1998 Okidata Division of OKI America Inc All rights reserved See the OKIDATA Business Partner Exchange BP X for any updates to this material http opx okidata com 67 Service Guide OKIPAGE 8c Chapter 3 Disassembly 3 3 40 Heat Unit Assy Fuser unit and oil roller 1 Open the stacker cover 2 Release the lock by turning down the lever lock heat guides blue on both sides then lift the fuser unit assy 1 and remove it Lever Lock Heat Guide Figure 3 3 40 Heat Unit Assy 1 40490901 Unit Fuser 120V OP8c RSPL 8 2 21 140490904 Unit Fuser 220V OP8c RSPL 8 2 21 0 Copyright 1998 Okidat
22. SW TE6135 6137 16550 53C80 Functional Block Diagram of Main Control Board 1 2 3 4 5 6 7 The CPU is 64 bit RISC architecture processor provided It inputs a frequency of 50 MHz and runs at 100 MHz It transfers data to a from memory at 50 MHz Mask ROM The mask ROM block consists of four 16 Mbit 1M x 16 bits chips and its total size is 8M bytes The chips are mounted on the PCR PCB by means of IC sockets and store programs and character fonts DRAM The DRAM block consists of eight 16 Mbit 1M x 16bits chips and its total size is 16M bytes The chips are mounted on the PCR PCB and can be expanded up to 80M bytes by adding the 32M byte SIMMs to the SIMM slots on the PCR PCB EEPROM The EEPROM block consists of 1K bit chips mounted on a board by means of IC sockets and stores the following e Menu data e Counter values e Adjustment values Flash ROM The Flash ROM block consists of four 4M bit 256K x 16bits chips and its total size is 2M bytes The chips are mounted on the PCR PCB and are used for storing fonts macro and demo pages Memory control LSI This block mainly consists of memory control CPU control compression and decompression and video interface functions Interface control LSI This block mainly consists of PU interface control operator panel interface control EEPROM control parallel interface control and HSP control functions 8 Host interface T
23. X for any updates to this material http bpx okidata com 59 Ok a Service Guide OKIPAGE 8c Chapter 3 Disassembly 3 3 32 Transfer Belt Open the Top cover Release the lock by drawing the cover knob then open the cover assy side L Turn the waste toner box box toner assy 1 to the left by pressing it down then remove it Draw out the belt cassette assy 2 by lifting it a little bit with its handle o Cover assy side L Copyright 1998 Okidata Division of OKI America Inc All rights reserved See the OKIDATA Business Partner Exchange BPX for any updates to this material http opx okidata com 60 Ok a Service Guide OKIPAGE 8c Chapter 3 Disassembly 3 3 33 High Voltage Power Supply Unit Bracket HV BT Assy the belt cassette assy See 3 3 32 Unscrew 2 screws 1 with the stacker cover opened then remove the plate HV 2 Unplug the cable 3 and 7 codes 4 Unscrew 2 screws 5 then remove the high voltage power supply unit 6 the bracket HV Assy 7 QT d ue Figure 3 3 33 High Voltage Power Supply Unit Bracket HV BT Assy Plate HV RSPL 82 415 6 40065601 Voltage Power Supply RSPL 8 2 13 7 40325001 Bracket HV BT Assy RSPL 8 2 14 Copyright 1998 Okidata Division of OKI America Inc All rights reserved See the OKIDATA Business Partn
24. a Division of OKI America Inc All rights reserved See the OKIDATA Business Partner Exchange BPX for any updates to this material http opx okidata com 68 Ok a Service Guide OKIPAGE 8c Chapter 3 Disassembly 3 3 41 Oil Roller Kit 1 Remove the heat unit assy See 3 3 40 2 Release the lock by turning down the lever in the arrow A direction then slide the oil roller assy 1 with its right side lifted and remove it Figure 3 3 41 Oil Roller Kit 1 40645301 Oil Roller Kit Consumable Je2 42 Copyright 1998 Okidata Division of OKI America Inc All rights reserved See the OKIDATA Business Partner Exchange BPX for any updates to this material http opx okidata com
25. an be performed For the electrical physical characteristics of this interface see APPENDIX B b OKI HSP interface Option This interface slot is an unique universal interface that provides the platform to connect various boards including those supplied by third vendors such as the LAN connection expansion board and SCSI expansion board Any expansion boards compatible with this interface can be mounted on the Control board the piggyback board from without modifying the program at the printer side Refer to the Conceptual Diagram of the OKI interface Network etc Control board LAN expansion board Conceptual Diagram of OKI HSP Interface 9 RAM module e Pin layout Network etc Control board LAM expansion board e Basic specification Type Access time 7 2 pins SIMM 32 bits buss width Capacity 60ns 7005 80ns Parity 4 8 16 32 or 64MB None Copyright 1998 Okidata Division of OKI America Inc All rights reserved See the OKIDATA Business Partner Exchange BP X for any updates to this material http opx okidata com Page 9 Service Guide OKIPAGE 8c Chapter 2 Operation 2 2 Engine Control Board PX4 PCB ANALOG INPUT Heater temperatures and environmental humidity and temperature Yellow Y Magenta M Cyan C Black B ANALOG INPUT Heater temperatures and envirnment humidity and temperature CPU EEPROM MSMB5524 BOM
26. c System Configuration This diagram shows the basic system configuration of OKIPAGE 8c LED head Discharging indicators LCL Lr Oparator panel Centronics interface Pulse motors KEP BELT HEATER REGIST FF 910101010 Sensors switches and thermistorsz Paper width sensor 4 Form size detector 4 bits Form end sensor OKI PSIMM x 2 interface interface ua fi t Er FF form end T p FF home gwitch Form feed sensor 1 Form iged sensor 2 power unit ias V Write sensor Election sensor JL Hich voltage Second tray Toner Low power unit Llp Down Waste toner sansar Resist Up Down Cover switch High voltage interlock switch Heater temperature ihermistor Backup temperature thermistor Environment temperature sensor Environment hurridity sensor Oil Faller switch Fixing unit interlock swatch Fixing unit ie fe oe a I Waste toner box switch Balt unit i C EP unit Basic System Configuration Diagram Copyright 1998 Okidata Division of OKI America Inc All rights reserved See the OKIDATA Business Partner Exchange BPX f
27. dures 8 Do not place printed circuit boards directly on the equipment or floor No Service Tools 17 1 0 Remarks mee mem No 2 200 Philips 3 5 mm screws 2 eee 1 mL cleaner LED Head cleaner Cleans LED P N 51802901 head Copyright 1998 Okidata Division of America Inc All rights reserved See the OKIDATA Business Partner Exchange BPX for any updates to this material http opx okidata com 26 Service Guide OKIPAGE 8c Chapter 3 Disassembly 3 2 Parts Layout Figure 3 1 Covers Figure 3 2 Print Assemblies Figure 3 3 Base Assemblies Figure 3 4 Contact Assemblies Copyright 1998 Okidata Division of OKI America Inc All rights reserved See the OKIDATA Business Partner Exchange BPX for any updates to this material http opx okidata com 27 Ok a Service Guide OKIPAGE 8c Chapter 3 Disassembly 3 3 How to Change Parts This section explains how to change parts and assemblies appearing in the disassembly diagram below 3 3 1 Cover Assy Rear 3 3 2 Motor Fan 80 25 3 3 3 Paper Eject Assy 3 3 4 Cover Assy Stacker Guide Eject FD Assy 3 3 5 Frame Assy Upper 3 3 6 Plate Support Assy 3 3 7 Limiter 2Way L R Plate Guide L R 3 3 8 Cover 3 3 9 PCB Assy PCR 3 3 10 Motor Fan CU 3 3 11 PXF PCB PX4 PCB 3 3 12 Gear Heat Assy 3 3 13 Main Mot
28. er 1 Remove the guide paper input assy See 3 3 23 2 Remove the paper end lever 1 by releasing the engagement with the guide Figure 3 3 28 Paper End Lever 50808201 4PP4076 5154P001 Lever Paper End RSPL 8 3 4 Copyright 1998 Okidata Division of OKI America Inc All rights reserved See the OKIDATA Business Partner Exchange BPX for any updates to this material http opx okidata com 56 Ok a Service Guide OKIPAGE 8c Chapter 3 Disassembly 3 3 29 PCO PCB Operator Panel 1 Remove the cover assy side R and the cover assy OP panel See 3 3 8 Unscrew 4 screws 1 and unplug the operator panel cable 2 Remove the PCO PCB 3 by releasing 6 claws Be careful not to drop the LCD Liquid Crystal Display 4 and 5 which are detached together Claw six EA Figure 3 3 29 PCO PCB Operator Panel 2 56636205 2381005 0005 Cable HCUN 1 25 6F 440 1056 RSPL 8 1 19 B M1 20624 3 140387201 A PCOPCB RSPL 8 1 18 40492601 Cover Sub Assy Op Panel RSPL 40314901 Cover Assy Op Panel 8 1 10 Includes 3 6 Copyright 1998 Okidata Division of OKI America Inc All rights reserved See the OKIDATA Business Partner Exchange BPX for any updates to this material http bpx okidata com 57 Ok a Service Guide OKIPAGE 8c Chapter 3 Disassembly 3 3 30 Holder Gear Toner Assy 1 Remove the cover assy
29. er Exchange BPX for any updates to this material http opx okidata com Page 61 Ok a Service Guide OKIPAGE 8c Chapter 3 Disassembly 3 3 34 Eraser Bracket Assy Eraser Bracket KCM Assy 1 Remove the belt cassette assy See 3 3 32 2 Open the stacker cover 3 Remove four screws 5 and then remove the Plate Blind 6 Removing the eraser bracket assy 4 Remove the screw 1 and the connector 2 5 Release the screw 7 and then remove the eraser bracket assy 3 Removing the eraser bracket KCM assy 6 Remove the screw 1 and the connector 2 7 Release the lock of the claw then release the engagement with the bracket sensor T KCM See 3 3 35 8 Release the screw 7 and then remove the eraser bracket KCM assy 4 and unplug the cable 2 then remove the eraser bracket KCM assy Figure 3 3 34 Eraser Bracket Assy Eraser Bracket KCM Assy 2 40172710 Wire AMP8P AMP2PX4 RSPL 8 4 20 40308501 Eraser Bkt Assy RSPL 8 4 8 4 40324301 Eraser Bkt KCM Assy RSPL 18 4 9 Copyright 1998 Okidata Division of OKI America Inc All rights reserved See the OKIDATA Business Partner Exchange BPX for any updates to this material http bpx okidata com 62 Ok a Service Guide OKIPAGE 8c Chapter 3 Disassembly 3 3 35 Shaft Link 1 Remove the eraser bracket assy See 3 3 34 Remove the gear one way 430 See 3 3 14 Remove the E r
30. er assy hopping 2 Detach the roller hopping 2 from the shaft 1 Figure 3 3 26 Hopping Roller Assy 140310601 Assy Hopping RSPL 8 3 23 includes NEN 2 40449701 Hoping Roller Boss Assy RSPL 8 3 42 1 40189601 Shaft Hopping Roller 1st RSPL 8 3 46 4 50608118 NK3 18 SUS 8 3 50 3 40743701 Roller Assy Hopping Sub RSPL Copyright 1998 Okidata Division of OKI America Inc All rights reserved See the OKIDATA Business Partner Exchange BPX for any updates to this material http bpx okidata com 54 Ok a Service Guide OKIPAGE 8c Chapter 3 Disassembly 3 3 27 PXU PCB PXM Lever Resist Sensor Since the PCB and PXM PCB are connected with each other via the cable remove them at the same time 1 Remove the guide paper input assy See 3 3 23 2 Unscrew 4 screws 1 and unplug the cable 2 then remove the PXU PCB 3 and PXM PCB 4 at the same time 3 Remove the lever resist sensor 5 by releasing the engagement with the guide D PXU PCB Figure 3 3 27 PXU PCB PXM PCB Lever Resist Sensor Copyright 1998 Okidata Division of OKI America Inc All rights reserved See the OKIDATA Business Partner Exchange BPX for any updates to this material http opx okidata com 55 Ok a Service Guide OKIPAGE 8c Chapter 3 Disassembly 3 3 28 Paper End Lev
31. es the Write Sensor until the rear edge of the paper passes the Form Feed Sensor 2 A Form Size Error occurs when the specified length is exceeded by 45 mm Copyright 1998 Okidata Division of OKI America Inc All rights reserved See the OKIDATA Business Partner Exchange BPX for any updates to this material http opx okidata com 20 Ok a Service Guide OKIPAGE 8c Chapter 2 Operation 2 9 Cover Opening When the upper side or front cover of the OKIPAGE 8 is opened the Cover open microswitch turns off the voltage of 32V to the high voltage power supply is shit off and all high voltage outputs are shut off At the same time the CPU receives a signal CVOPN indicating the status of the microswitch and performs the cover open process Uppercover Side cover Front cover PX4 PCB eee D CPU l pes MK 65524 COVOPN 2P 4 7 12 High voltage power supply board HVOLT 16P High voltage power supply unit Copyright 1998 Okidata Division of OKI America Inc All rights reserved See the OKIDATA Business Partner Exchange BPX for any updates to this material http opx okidata com 21 Ok a Service Guide OKIPAGE 8c Chapter 2 Operation 2 10 Toner Lower Detection e Composition The device consists of the stirring gear which rotates at a constant rate the stirring bar and the magnet on the stirring bar The stirring bar
32. g the obtained environmental conditions The unit then prints using the optimum transfer voltage Copyright 1998 Okidata Division of OKI America Inc All rights reserved See the OKIDATA Business Partner Exchange BPX for any updates to this material http opx okidata com Page 19 Ok a Service Guide OKIPAGE 8c Chapter 2 Operation 2 8 Form Jam Detection OKIPAGE 8c checks for a paper jam when the page printer is powered on and during printing When a paper jam is found the OKIPAGE 8c immediately stops the printing process To recover the printer open the cover find and remove the jammed paper then close the cover Eror Form feed jam Three hopping operations are made but the Form Feed sensor Entrance does not turn on within a preset time after the Form Feed sensor 1 turns on Convey jam The ejection sensor does not turn on within a preset time period after the Write sensor detects the front end of paper Ejection jam The eject sensor detected the front edge of the paper but does not detect the rear edge of the paper within a preset time period Form size error The form size obtained by measuring the time period between the rear edge of the paper passes by the Form Feed sensor 2 after the front edge of the paper passed the Write sensor is longer by 45mm than the specified form length To obtain the form size measure the time interval from when the front edge of the paper pass
33. he printer has the following interfaces to the host Centronics bi directional parallel interface OKI HSP interface Option The single effective interface or the automatic interface select mode can be selected using the menu If the busy state of the printer continues for a long time period the buffer near full control releases the busy status at constant intervals even if the host side is busy so as not to cause interface time out at the host side a Centronics bi directional parallel interface This is an interface confirming to IEEE 1284 and provides either unidirectional ad bi directional communications according to each of the following communication modes e Compatibility mode Unidirectional communications from the host to the printer e Nibble mode This mode transfers 4 bit wide data from the printer to the host In this mode each bit of 1 byte data transmits in the form of two nibbles using ERROR BUSY FAULT and SELECT signal leads This mode can provide bi directional operation in combination with the compatibility mode e ECP mode This mode provides the asynchronous bi directional interface and transmits and receives 1 byte data using eight data signal leads under semi duplex control by the host When the power is turned on the compatibility mode is automatically selected The change to another mode form the compatibility mode is made through negotiation When the BI DIRECTION is set to ENABLE in the menu this change c
34. idata Division of OKI America Inc All rights reserved See the OKIDATA Business Partner Exchange BPX for any updates to this material http opx okidata com Page 63 Ok a Service Guide OKIPAGE 8c Chapter 3 Disassembly 3 3 36 Contact Bracket BL R Assy Contact Bracket CL R Assy 1 gs 3 4 the gear one way 230 See 3 3 14 Remove the motor assy See 3 3 15 Remove the high voltage power supply unit See 3 3 33 the shaft link See 3 3 35 Removal of the contact BL R Assy 5 Unscrew 2 screws 1 and unplug the cable 2 then rmeove the contact BL R assy 3 Removal of the contact CL R Assy 6 Unscrew 2 screws 4 then remove the contact CL R Assy 5 Contact CL R Assy Contact BL R Assy Figure 3 3 36 Contact Bracket BL R Assy Contact Bracket CL R Assy 40173301 Wire Amp 14p 1MPX43 RSPL 8 4 18 40309001 Contact BK T CL R Assy RSPL 8 4 7 2 _ 40135301 Interrupter_ 846 Copyright 1998 Okidata Division of OKI America Inc All rights reserved See the OKIDATA Business Partner Exchange BPX for any updates to this material http opx okidata com Page 64 Ok a Service Guide OKIPAGE 8c Chapter 3 Disassembly 3 3 37 Contact BL L Assy Contact CL L Assy 1 Remove the shaft link See 3 3 35 Removal of the contact BL L as
35. ing 3 by sliding the sensor assy T KCM 1 and bracket sensor T KCM 2 together in the arrow A direction 4 Release the engagement between the lever Up Dn and boss A of the lever link R 5 by sliding the spring support R 4 lever link R 5 and the bearing 6 together in the arrow B direction Keep on sliding until the lever link R 5 reaches the end of D cut part of the shaft link 7 5 Draw out the entire shaft link 7 by pressing it in the arrow C direction and turning its left side under the contact BL L assy 6 Detach the sensor assy T KCM 1 bracket sensor T KCM 2 spring support R 4 lever link R 5 and the bearing 6 from the shaft link 7 7 Remove 2 E rings 8 then remove the spring support L 9 and lever link L 10 Notice for mounting e Engagement between the lever Up Dn and boss A of the lever link R 5 Mount the spring support L 9 and lever link L 10 in the predetermined positions then clamp the boss A of lever link R 5 with the lever Up Dn by adding rotating power on the spring support L 9 by rotating the shaft link 7 e Mounting of the spring support R 4 Clamp the spring support R 4 at the predetermined positions in the lever link R 5 and the contact R Lever Up Down Figure 3 3 35 Shaft Link 5 40132301 Lever Link R 8 41 4 40168401 Spring Support R RSPL 8 4 14 Copyright 1998 Ok
36. it Assy 60 000 pages Transfer Belt Cassette Assy 50 000 pages 12 Temperatures and relative humidities Temperature Temperature conditions Fahrenheit Celsius Remarks 1 10 1 O Operating 50 to 89 6 10 to 32 17 Celsius to 27 Celsius for assurance of full color printout quality Non operating 32 to 109 4 0 to 43 Power off Storage 1 year max 14 to 109 4 10 to 43 with drum and toner Delivery 1 month max 20 to 122 29 to 50 without drum and toner and Belt Cassette Assy Delivery 1 month max 20 to 122 29 to 50 with drum and toner Humidity Humidity condition Operating 20 to 80 5096 to 70 for assurance of full color printout quality Non operating 10 to 90 Power off 100090 35 100090 40 17 13 Printer life 3 000 000 A4 pages or 5 years Copyright 1998 Okidata Division of OKI America Inc All rights reserved See the OKIDATA Business Partner Exchange BPX for any updates to this material http opx okidata com Page 7 Ok a Service Guide OKIPAGE 8c Chapter 2 Operation 2 Operation OKIPAGE 8c is a tandem color electrophotographic page printer using 4992 Pixel LED technologies dry single component non magnetic developing roller transfer heat compression fixing fusing The printing method used is a Black Writing method which applies light beams to printout areas Here is the Functional Block Diagram of OKIPAGE 8c
37. jected ejected Copyright 1998 Okidata Division of OKI America Inc All rights reserved See the OKIDATA Business Partner Exchange BPX for any updates to this material http bpx okidata com Page 16 Ok a Service Guide OKIPAGE 8c Chapter 2 Operation 2 5 2 Other sensors 1 Form end sensor This sensor checks whether the paper cassette is empty 2 Front Feeder form end sensor This sensor checks whether the front feeder has paper 3 Front Feeder home switch The microswitch checks whether the front feeder stage is in the up or down position 4 Image Drum Image drum up down sensor for each color Y M C K Y Yellow Magenta C Cyan Black 5 Waste toner sensor This sensor judges whether the waste toner cartridge is full by measuring a time period at which the sensor lever turns on periodically When the time period falls under a preset value the system judges that the waste toner cartridge is full and displays the waste toner full message 6 Resist up down sensor This sensor detects the up or down position of the resist roller 2 7 Temperature sensor Refer to 2 7 Transfer Control according to Environmental Changes 8 Humidity sensor Refer to 2 7 Transfer Control according to Environmental Changes Copyright 1998 Okidata Division of OKI America Inc All rights reserved See the OKIDATA Business Partner Exchange BPX for any updates to this material http op
38. of IC socket and stores adjustment values Pulse motor drivers These drivers MI D2005F drive eight pulse motors for moving up and down the image drum EP and transferring medium Video memory This SRAM received print data through video interface and stores it Copyright 1998 Okidata Division of OKI America Inc All rights reserved See the OKIDATA Business Partner Exchange BPX for any updates to this material http bpx okidata com Page 10 Ok a Service Guide OKIPAGE 8c Chapter 2 Operation 2 0 Power Board The power board consists of an AC filter circuit a low voltage power supply circuit a high voltage power supply circuit and heater drive circuit and photo sensors 1 Low voltage power supply circuit This circuit generates the following voltages Output voltage os o o o 483 3V jCUUnit CPU LED HEAD Logic circuit supply voltage 32 V Motor and fan drive voltage and source voltage for high voltage supply discharge lamp HSP OP Amp high voltage power supply 2 High voltage power supply circuit This circuit generates the following voltages necessary for electro photographic processing from 32 V in accordance with the control sequence from the control board When cover open state is detected 32 V supply is automatically interrupted to stop the supply of all high voltage outputs YMCK Yellow Magenta Cyan Black Voltage Use Remarks 1 35
39. on 5 Remove the gear 1 and 2 bushes 2 and 2 bearings 3 then 2 roller registrations 4 Removal of the roller assy hopping 6 Remove the bush 5 and the bearing 6 7 Remove E rings 9 of the sub roller hopping at both sides of hopping roller and then release the lock of the roller hopping 7 with the shaft 8 by spreading the claw then remove the roller hopping from the left side by the sliding shaft 8 in the arrow direction Be careful not to lose the knock pin for fastening the roller hopping 7 which slisp off together Figure 3 3 25 Roller Registration Roller Assy Hopping 40310601 Roller Assy Hopping 83 593 includes a 7 40449701 Hopping Roller Boss Assy RSPL 8 3 42 8 40189601 Shaft Hopping Roller 1st RSPL 8 3 46 50608118 NK3 18 SUS RSPL 8 3 50 10 40743701 Assy Hopping Sub RSPL 8 3 66 4 40130801 Registration RSPL 8 3 22 Copyright 1998 Okidata Division of OKI America Inc All rights reserved See the OKIDATA Business Partner Exchange BPX for any updates to this material http opx okidata com 53 Ok a Service Guide OKIPAGE 8c Chapter 3 Disassembly 3 3 26 Hopping Roller Assy 1 Remove the roller assy hopping See 3 3 25 and remove the 2 sub roller hopping guide 3 Be careful not to lose the knock pin which clips off together when removing the roll
40. or A B Assy 3 3 14 Gear Z30 3 3 15 Motor Assy BT 3 3 16 Power Supply Unit Holder Inlet Sheet Insulation 3 3 17 Sensor Assy Box Toner 3 3 18 Square shaped Connector 3 3 19 Hopping Motor 3 3 20 Gear One Way 3 3 21 Feeder Unit Front 3 3 22 Manual Feed Hopper Assy 3 3 23 Guide Paper Input Assy 3 3 24 Lever Input Sensor 3 3 25 Roller Registration Roller Assy Hopping 3 3 26 Roller Hopping 3 3 27 PCB PXM PCB Lever Regist Sensor 3 3 28 Paper End Lever 3 3 29 PCO PCB Operator Panel 3 3 30 Holder Gear Toner Assy 3 3 31 Plate Latch Lever FD Spring Latch Lever FD 3 3 32 Belt Cassette Assy 3 3 33 High Voltage Power Supply Unit Bracket HV 3 3 34 Erase Bracket Assy Eraser Bracket 3 3 35 Shaft Link 3 3 36 Contact BL R Assy Contact CL R Assy 3 3 37 Contact BL L Assy Contact CL L Assy 3 3 38 Contact SB Assy 3 3 39 PXC PCB 3 9 40 Heat Unit Assy 3 3 41 Oil Roller Assy 3 3 42 Lever Lock Heat L R Guide Side Heat Spring Lock 3 3 43 PXL PCB 3 3 44 Heat Unit Guide Assy 3 3 45 Holder LED Assy LED Head Copyright 1998 Okidata Division of OKI America Inc All rights reserved See the OKIDATA Business Partner Exchange BPX for any updates to this material http opx okidata com 28 Ok a Service Guide OKIPAGE 8c Chapter 3 Disassembly 3 3 1 Cover Assy Rear Remove the 2 screws 1 then lift the cover assy rear 2 a little bit then remove the cover as
41. or any updates to this material http bpx okidata com Page 4 Ok a Service Guide OKIPAGE 8c Chapter 1 Specifications 1 2 Printer Specifications This printer unit is composed of the following hardware Electro photographic processor Paper feeder Controller CU part PU Part Operator panel Power board High voltage part PU part This diagrams shows the printer unit configuration Stacker Cover Assy Face up Slacker Assy lF Cover Assy Operator Panel Assy Side Cover LY ASSY Printer Unit Configuration Diagram Copyright 1998 Okidata Division of OKI America Inc All rights reserved See the OKIDATA Business Partner Exchange BPX for any updates to this material http opx okidata com 5 Ok a Service Guide OKIPAGE 8c Chapter 1 Specifications 1 3 Option Specifications The OKIPAGE 8c options are listed below 1 Second Paper Feeder 2 RAMM SIMM module 72 pin SIMM 4MB 8MB 16MB 32MB e Make sure to use a set of 2 of the same volume size modules Copyright 1998 Okidata Division of OKI America Inc All rights reserved See the OKIDATA Business Partner Exchange BPX for any updates to this material http opx okidata com OKI Page 6 Service Guide OKIPAGE 8c Chapter 1 Specifications 1 4 Basic Specifications 1 Dimensions 2 Weight 3 Form Type Sizes Reams 4 Printing speed 5 Resolution 6 Input voltage
42. paring the sum of bits in the received data unit by the number of bits in the transferred data unit RAM check a Checks RAM by writing a preset data patter in RAM reading the contents of RAM and comparing the data read from RAM by the data written in RAM Write read test b Checks optional RAM if it is installed c Checks resident RAM by exclusively O Ring high and low addresses to prepare 16 bit data units writing a preset 16 bit data patter in RAM reading the contents of RAM and comparing the data read from RAM by the data written in RAM Checks optional RAM by writing and reading 32 bit fixed patterns 5555h and aaaah in optional RAM EEPROM check a Checks identification numbers stored in the fixed addresses of EEPROM b Checks the contents of the menu area by control firmware and the engine area by engine firmware Flash ROM check Checks Flash ROM by writing a present data pattern in Flash ROM reading the contents of Flash ROM and comparing the data read from Flash ROM by the data written in Flash ROM Write read test Option check unit Checks whether the optional units such as the second tray and PS SIMM have been installed before entering the operation mode Copyright 1998 Okidata Division of OKI America Inc All rights reserved See the OKIDATA Business Partner Exchange BPX for any updates to this material http opx okidata com 24 OKI Service Guide OKIPAGE 8c
43. per Eject Assy RSPL Copyright 1998 Okidata Division of OKI America Inc All rights reserved See the OKIDATA Business Partner Exchange BPX for any updates to this material http opx okidata com Page 31 Ok a Service Guide OKIPAGE 8c Chapter 3 Disassembly 3 3 4 Cover Assy Stacker Guide Eject FD Assy the cover assy rear See 3 3 1 Release the cable from the cable clamp 1 by opening the clamp Unscrew 8 screws 2 then remove the cover assy stacker 3 Do gt Unscrew 4 screws 4 then remove the guide eject FD assy 5 x6 Figure 3 3 4 Cover Assy Stacker Guide Eject FD Assy 40314801 Cover Assy Stacker RSPL Includes 40303601 Guide Eject FD Assy RSPL 40449901 Cover Sub Assy Stacker Item 2 50318701 PP4083 5670P001 Screw RSPL Copyright 1998 Okidata Division of OKI America Inc All rights reserved See the OKIDATA Business Partner Exchange BPX for any updates to this material http opx okidata com 32 Ok a Service Guide OKIPAGE 8c Chapter 3 Disassembly 3 3 5 Upper Frame Assy Hemove the cover assy rear See 3 3 1 the cover assy stacker See 3 3 4 Remove the holder LED assy See 3 3 45 Detach the cable from the cable clamp 1 by releasing its lock Remove connections of 4 connector cables 2 and 4 cables 3 Unscrew 4 screws 4 then remove the PD6 PCB 5 Unscrew 2 screw 6
44. present direction by means of the one way clutches a First and second hopping rollers 1 When the front edge of the paper passes by the pickup roller the pulse motor of the front feeder turns counter clockwise in the direction of b to drive the cam The cam moves up the pinch roller 2 Although the one way clutch gear A is also rotating the hopping roller of the front feeder does not rotate because of the one way clutch 2 When the rear edge of the paper passes by the Entrance sensor 2 the pulse motor of the front feeder turns counter clockwise in the direction of b to drive the cam The cam moves down the pinch roller 2 until itis sensed by the sensor Although the one way clutch gear A is also rotating the hopping roller of the front feeder does not rotate because of the one way clutch Idle gear Hopping roller M Sensor Pickup roller One way clutch gear Form sensor Idle gear B Pinch roller 2 Resist roller 2 Paper from the tray b Front feeding hopping 1 The pulse motor of the front feeder turns right in the direction of a to drive the hopping roller The paper feeds until the Entrance sensor 2 is activated Although the one way clutch gear B is also rotating the pinch roller 2 does not drive the up down cam because of the one way clutch After the Entrance sensor is activated the paper feeds until it reaches the resist roller 2 This operation corrects any paper skew One
45. ransfer roller sughe unt 7 Fixing The toner image just transferred to the paper is fused and fixed to the paper while the paper is passing through the gap between the heat roller and the backup roller The teflon coated surface of the heat roller is heated by the 800 watt heater or a halogen lamp in the heat roller The temperature of the heat roller surface is controlled by a thermistor in contact with the surface of the heat roller A thermostat is provided for safety When the heat roller temperature rises above the preset temperature the thermostat opens and shuts off power to the heater in the heat roller The backup roller is evenly pushed against the heat roller by two end springs Hist Heat roller Pa Themnsior Backup roller 8 Cleaning The toner which remains on the OPC Image Drum without being fused is scraped by a cleaning blade and discarded in the waste toner tank UPC drum Transfer roller Copyright 1998 Okidata Division of OKI America Inc All rights reserved See the OKIDATA Business Partner Exchange BPX for any updates to this material http opx okidata com Page 13 OKI Service Guide OKIPAGE 8c Chapter 2 Operation 2 4 2 Paper running process How paper moves through the OKIPAGE 8c is shown in the Paper Route Diagram YzYellow K Black i dij 1 play i A 42 7 Duiddou eau omo a m we u MEN a Ajddns
46. rocess applies toner to the latent image on the surface of the drum to create toner image Developing is carried out on the surface of the image drum at where the image contacts with the developing roller 1 The sponge roller transfers toner to the developing roller The toner is charged negatively Developing toner blade Charging roller sponge roller Developing raller OPC drum 2 The toner blade scrapes away excess toner from the developing roller leaving a thin film of toner on the surface of the developing roller 3 The toner is attracted to the latent image on the surface of the image drum where the image drum contacts the developing roller The latent image on the surface of the image drum is made visible with the toner 6 Transferring The transfer roller made of conductive sponge presses the paper against the surface of the image drum The paper will make close contact with the surface of the image drum This process fits the paper to the surface of the image drum using the transfer roller and applies a positive charge opposite to the charge of the toner from under the paper When a positive high voltage is applied to the transfer roller from the power supply the positive charge induced on the transfer roller jumps to the upper surface of the paper where the transfer roller touches the paper and attracts the negatively charged toner from the surface of the image drum onto the surface of the paper T
47. rotates by engaging with the concave section in the stirring gear joe d Magnet Stirring Bar Stirring Gear e Operation Toner Low is detected by monitoring the time interval between engagement of the magnet set on the sensor lever and the magnet on the stirring bar OPERATION during toner full state String Gear Section e he stirring bar rotates by interlocking with Stirring Bar the stirring gear e When the magnet on the stirring bar reaches its maximum height the other end of the bar is dipped in the toner The stirring bar is pushed by the stirring gear Sensor Lever Toner Sensor Operation during toner low state e When the stirring bar reaches the maximum Mid height the lack of toner provides no resistance on the other end The bar falls to the minimum height due to its own weight e The time length of the encounter between the stirring bar magnet and the sensor lever magnet counter with the magnet of the sensor lever becomes long By monitoring this time interval toner low is detected Sansor Lawes TONER FULL state THASNS ey 1 0 74 SEC Y 1 1 165 SEC IM C t 1 365 SEC TONER LOW state TNRSNS d r1 F i ti gt 0 74 SEC Y 1 965 SEC 1 gt 1 165 SEC M e When the toner low state is detected 2 times consecutively Toner Low is established When the toner full state is detected 2 times consecutively Toner Low is canceled e When there is no change with the
48. rved See the OKIDATA Business Partner Exchange BPX for any updates to this material http opx okidata com 12 Ok a Service Guide OKIPAGE 8c Chapter 2 Operation 2 4 1 Electrophotographic processing mechanism 1 2 Electrophotographic processed Each process of the electrophotographic processing mechanism is outlined below 1 Paper pickup This process causes the roller to give a DC voltage to the paper resulting in a negative charge With this negative charge the paper is electrostatically attracted to the roller 2 Charging This process gives a DC voltage to the charge roller so that the image drum may have a uniform negative charge on its surface 3 Exposure This process causes the LED head to apply light beams according to image signals to the negatively charged surface of the image drum The negative charge on the illuminated surface of the image drum is reduced according to magnitudes of the light beams Thus a latent image is formed on the surface of the image drum according to the resulting surface potentials 4 Developing and recovery of excessive toner This process applies negatively charged toner to the surface of the image drum The toner is electrostatically attracted to the latent image to form a visible image on the surface of the image drum Simultaneously this process electrostatically transfers excessive toner from the image drum to the developing roller 5 Transferring
49. s reserved See the OKIDATA Business Partner Exchange BPX for any updates to this material http opx okidata com 49 Ok a Service Guide OKIPAGE 8c Chapter 3 Disassembly 3 3 22 Manual Feed Hopper Assy 1 Open the manual feed hopper assy 2 Release the engagement between the holder and the link then remove the manual feed hopper assy Be careful not to damage the holder 9 Figure 3 3 22 Manual Feed Hopper Assy Copyright 1998 Okidata Division of OKI America Inc All rights reserved See the OKIDATA Business Partner Exchange BPX for any updates to this material http bpx okidata com 50 Ok a Service Guide OKIPAGE 8c Chapter 3 Disassembly 3 3 23 Guide Paper Input Assy 1 Remove the cover assy OP panel cover front R ad the cover front L See 3 3 8 Remove the feeder unit front See 3 3 21 Unscrew 4 screws 1 then draw out the guide paper input assy 2 from the left side by rotating its upper part Be careful not to damage the lever sensor resist Lever Sensor Resist ae n ES E wx Li rrr lt he r DLE Figure 3 3 23 Guide Paper Input Assy 2 140303301 Paper Input assy RSPL 8 3 24 40097301 Guide Paper Input RSPL 8 3 43 40144301 Lever Input Sensor RSPL 8 3 44 40144401 2nd Feed Sensor RSPL 8 3 45 Copyright 1998 Okidata Division of
50. side R cover assy OP panel cover front R and the cover front L See 3 3 8 2 Unplug the cable 1 and unscrew the screw 2 then remove the holder gear toner assy 3 Figure 3 3 30 Holder Gear Toner Assy 3 140309801 Holder Gear Toner Assy RSPL 8 2 10 Copyright 1998 Okidata Division of OKI America Inc All rights reserved See the OKIDATA Business Partner Exchange BPX for any updates to this material http opx okidata com 58 Ok a Service Guide OKIPAGE 8c Chapter 3 Disassembly 3 3 31 Plate Latch Lever FD Spring Latch Lever FD 1 Remove the cover assy side R cover assy OP panel cover front R and the cover front L See 3 3 8 Open the cover CU See 3 3 11 Unplug the cable 1 Unscrew the screw 2 then remove the bracket SW side 3 Unscrew 4 screws 4 then remove the stay upper front 5 Pak wD Remove the plate latch lever FD 6 and spring latch lever FD 7 with the side frames spread Be careful not to spread the frames too much Figure 3 3 31 Plate Latch Lever FD Spring Latch Lever FD 40388501 SW RSPL 8 3 33 5 401711041 Stay Upper Front RSPL 8 3 32 6 140195101 Plate Latch Lever FD RSPL 8 3 34 7 140195001 Spring Latch Lever FD RSPL 8 3 35 Copyright 1998 Okidata Division of OKI America Inc All rights reserved See the OKIDATA Business Partner Exchange BP
51. sy 2 Unscrew 2 screws 1 then remove the contact BL L Assy 2 Removal of the contact CL L assy 3 Unscrew 2 screws 93 then remove the contact CL L assy 4 Contact CL L Assy Contact BL L Assy Figure 3 3 37 Contact BL L Assy Contact CL L Assy 2 40324501 Contact BL L Assy RSPL 8 4 1 p includes Contact CL L Assy BAM A BohhPats A Both Parts Copyright 1998 Okidata Division of OKI America Inc All rights reserved See the OKIDATA Business Partner Exchange BPX for any updates to this material http opx okidata com 65 Ok a Service Guide OKIPAGE 8c Chapter 3 Disassembly 3 3 38 Contact SB Assy Remove the contact BL L assy and contact CL L assy See 3 3 37 Unscrew 3 screws 1 then remove the plate blind 2 Unplug 7 codes 3 Unscrew 3 screws 4 then remove the contact SB assy 5 Figure 3 3 38 Contact SB Assy 2 40290201 Plate Blind RSPL 8 3 9 5 40308801 Contact SB Assy RSPL 8 3 8 Copyright 1998 Okidata Division of OKI America Inc All rights reserved See the OKIDATA Business Partner Exchange BPX for any updates to this material http opx okidata com 66 Ok a Service Guide OKIPAGE 8c Chapter 3 Disassembly 3 3 39 PXC PCB Remove the contact BL R assy and contact CL R assy See 3 3 36
52. sy rear by releasing the two claws Figure 3 3 1 Cover Assy Rear 40315201 Cover Assy Rear RSPL Includes 40098401 Cover Rear 40187501 Stacker Face up 40187601 Support Stacker Copyright 1998 Okidata Division of OKI America Inc All rights reserved See the OKIDATA Business Partner Exchange BPX for any updates to this material http opx okidata com 29 Ok a Service Guide OKIPAGE 8c Chapter 3 Disassembly 3 3 2 Motor Fan 80 25 Remove the cover assy rear See 3 3 1 Remove the two screws 1 Detach the fan motor 2 from the guide with its right side lifted then draw the fan motor qe c Detach the cable 3 then remove the fan motor 3 Figure 3 3 2 Fan Motor 80 25 40255201 Motor 80 25 RSPL Copyright 1998 Okidata Division of OKI America Inc All rights reserved See the OKIDATA Business Partner Exchange BPX for any updates to this material http opx okidata com Page 30 Ok a Service Guide OKIPAGE 8c Chapter 3 Disassembly 3 3 3 Paper Eject Assy The paper eject assy includes the frame eject assy and the guide paper eject assy the cover assy rear See 3 3 1 Open the top cover Unscrew 4 screws 1 then remove the frame eject assy 2 Dope Remove the guide paper eject assy 3 by releasing the lock of one claw Figure 3 3 3 Paper Eject Assy 40303501 Frame Eject Assy RSPL 40303401 Guide Pa
53. t BL L Assy Contact CL L Assy 64 3 3 38 Contact SB Assy 65 3 3 39 PXC PCB 66 3 3 40 Heat Unit Assy Fuser unit and oil roller 67 9 9 41 Oil Roller Kit 68 3 3 42 Lever Lock Heat L R Guide Side Heat Spring Lock 69 3 3 43 PXL 70 3 3 44 Heat Unit Guide Assy 71 3 3 45 Holder LED Assy LED Head 72 4 Adjustments 4 Adjustments 73 4 1 Maintenance Modes and Their Functions 74 4 1 1 User maintenance mode 75 4 1 2 System maintenance mode 76 4 1 3 Engine maintenance mode 77 4 2 Adjustments after Parts Replacement 78 4 2 1 Confirm the LED head driving time 79 Table of Contents Page 4 2 2 Color Registration Using the Operator Panel Color 80 deviation correction 5 Maintenance Preventive Maintenance 81 9 1 Periodically Replaced Parts 82 9 2 Cleaning 83 9 4 Cleaning the Pickup Roller 84 6 Troubleshooting Procedures 6 0 Troubleshooting Procedures 85 6 1 Troubleshooting Tips 86 6 2 Points to Check before Correcting Image Problems 87 6 4 Preparation for Troubleshooting 88 6 5 Troubleshooting Flow 89 TUN 6 5 1 LCD status message problem list 90 T 6 5 2 LCD message troubleshooting 91 m 6 5 3 Image Troubleshooting 92 Blank paper 93 Vertical black 94 odd Vertical white 95 e Poor fusing Images are blurred or peeled off when 96 touched QH Evenly spaced repeating marks 97 Missing characters or colors 98 nm Poor synthesiza
54. the image drum unit is applied to the up down lever via the up down actuator of the image drum unit The free up down gear turns right in the direction b in Figure 2 6 a and the image drum unit goes down until the up down actuator of the image drum unit is stopped by the up down lever See Figure 2 6 c During this the image is transferred onto the running paper VD unit up down actuator PAE PERS YN OG a Up down lever Upward Movement of Image Drum Up down lever Downward Movement of Image Drum 3 Lubrication and cleaning of fixing ejecting and heat rollers Face down stacker 4 4 Ejection roller Oll roller Oil cleaning roller 1 1 Backup roller Fixer Heat motor The fixing roller the ejecting roller and the heat roller are lubricated and cleaned by a single pulse motor When the heat roller pulse motor turns right in the direction of a the heat roller and the backup roller turn left in the direction of a to fix a toner image onto the paper At the same time three ejection rollers turn right in the direction of a to eject the paper The oil roller and the oil cleaning roller turn left in the direction of a to supply oil to the surface of the heat roller and clean the surface Copyright 1998 Okidata Division of OKI America Inc All rights reserved See the OKIDATA Business Partner Exchange BPX for any updates to this material
55. tion Color 99 m Printout colors different from original colors 7 Wiring Diagram 7 1 Resistance Check 100 7 2 Program Font ROM Location 101 8 Centronics Parallel Interface Centronics Parallel Interface 102 A Illustrated Parts List Diagram A1 Covers Top amp Sides 103 Diagram A2 Printer Unit 104 Diagram A3 Main Chassis Unit 1 105 Diagram A4 Main Chassis Unit 2 106 Diagram A5 Main Chassis Motor PCB 107 Diagram A6 Frame Upper Assy 108 Diagram A7 Guide Cassette R Assy 109 Diagram A8 Main Motor A Assy 110 Diagram A9 Main Motor B Assy 111 Product Accessory Second Paper Feed Preface 112 1 0 Outline 113 Table of Contents Page 1 1 Functions 114 1 2 External View and Component Names 115 2 0 Mechanism Description 116 2 1 General Mechanism 117 2 2 Hopper Mechanism 118 3 0 PARTS REPLACEMENT 119 3 1 Precautions Concerning Parts Replacement 120 3 2 Parts Layout 121 3 3 Parts Replacement Methods 122 A 3 3 1 Idle rollers 123 eds 3 3 2 AOLT PCB 124 er 3 3 3 Hopping motor 125 ere 3 3 4 Feed roller 126 3 3 5 Hopping roller 127 E 3 3 6 Side frame L assy 128 T 3 3 7 Side frame R assy 129 4 0 Troubleshooting 130 4 1 Precautions Prior to the Troubleshooting 131 4 2 Preparations Prior to the Troubleshooting 132 4 3 Troubleshooting Method 133 4 3 1 LCD Status Message List 134 4 3 2 Troubleshooting Flow 135 5 0 CONNECTION DIAGRAM 136 1 Interconnection Diagram 1
56. toner sensor for 2 cycles 1 965 sec x 2 or more the Toner Sensor Alarm is activated e The toner sensor is not monitored while the drum motor is in halt Copyright 1998 Okidata Division of OKI America Inc All rights reserved See the OKIDATA Business Partner Exchange BPX for any updates to this material http bpx okidata com 22 Ok a Service Guide OKIPAGE 8c Chapter 2 Operation 2 11 Page Size Detection The four tab pieces are driven according to the setting position of the paper guide through the cam interlocked with the paper guide of the paper cassette When the paper cassette is inserted into the printer the position of the tab pieces is detected by a microswitch recognizing the paper size STATE OF MICROSWITCHES 0111111 0 1 0 11 2 L0 0 11 11 40 1210 11 11 3 Copyright 1998 Okidata Division of OKI America Inc All rights reserved See the OKIDATA Business Partner Exchange BPX for any updates to this material http bpx okidata com 23 Ok a Service Guide OKIPAGE 8c Chapter 2 Operation 2 12 Power on Processing 2 12 1 Self diagnostic test 1 2 3 4 5 6 Initial test The following check are automatically performed when the printer is power on ROM check RAM check EEPROM check Flash ROM check b C d ROM check a Checks ROM by com
57. ve the power switch and AC socket from the holder inlet Unplug the cable 1 Remove cable 2 screw 5 and bracket 6 in order and then take off SW from bracket 6 to pull off square shaped connector 4 Figure 3 3 18 Square shaped Connector m PB4043 4718 8 3 38 P001 6 140446501 7 Interlock SW Cable Assy RSPL 8 3 53 4 40563100 Connection Cord Wire RSPL 8 3 437 Copyright 1998 Okidata Division of OKI America Inc All rights reserved See the OKIDATA Business Partner Exchange BPX for any updates to this material http opx okidata com 46 Ok a Service Guide OKIPAGE 8c Chapter 3 Disassembly 3 3 19 Motor Pulse ID 1 Remove the cover assy side R cover assy OP panel and the cover front R See 3 3 8 2 Unscrew 2 screws 1 and unplug the cable 2 then remove the bracket hopping motor 3 Be careful not to lose the gears 5 6 and 7 which slip off at this time 3 Unscrew 2 screws 8 then remove the hopping motor 3 Copyright 1998 Okidata Division of OKI America Inc All rights reserved See the OKIDATA Business Partner Exchange BPX for any updates to this material http opx okidata com 47 Ok a Service Guide OKIPAGE 8c Chapter 3 Disassembly 3 3 20 One way Gears 1 Remove the bracket hopping motor See 3 3 19 2 Remove the spacer 4 first and release the locks with the shaft by spreading the
58. w then remove the gear one way Z30 1 Notice for mounting Mount the gear one way Z30 by fitting it with the shaft link turned in the arrow direction 40208101 Gear One Z30 RSPL 8 545 Figure 3 3 14 Gear One Way 730 Copyright 1998 Okidata Division of OKI America Inc All rights reserved See the OKIDATA Business Partner Exchange BPX for any updates to this material http opx okidata com 42 Ok a Service Guide OKIPAGE 8c Chapter 3 Disassembly 3 3 15 Motor Assy Belt 1 Remove the main motor B assy See 3 3 13 2 Unplug 2 cables 1 connected and unscrew 2 screws 2 then remove the motor assy belt 3 Figure 3 3 15 Motor Assy Belt 3 140392301 Motor Assy Belt RSPL 8 5 1 nduds J 40124101 Motor Pulse RSPL 8 5 11 Photo Interrupter RSPL 8 5 39 40135301 40450001 Belt Motor Mech Assy RSPL 8 5 37 Copyright 1998 Okidata Division of OKI America Inc All rights reserved See the OKIDATA Business Partner Exchange BPX for any updates to this material http opx okidata com 43 Ok a Service Guide OKIPAGE 8c Chapter 3 Disassembly 3 3 16 Power Supply Unit Holder Inlet Sheet Insulation Remove the motor fan 80 25 See 3 3 2 Remove the frame side L the cover assy side and the cover rear L See 3 3 8 Detach the cable 1
59. way clutch gear B Idle gear Cam Hopping roller Sensor Pickup roller 2 j j F P mac P Form sensor Idle gear B Entrance sensor 2 One way clutch gear Paper from front feeder Resist roller 2 c Conveying 1 After paper hopping is completed the pulse motor turns right in the direction of b to drive the resist rollers 1 and 2 The resist rollers feed the paper until the Form sensor turns on 2 Although the one way gear A is also driven the first hoping roller does not turn because of the one way clutch Resist roller 2 One way gear First hopping roller 2 Up down movement of the image drum unit and rotation of the image drum The up down movement of the image drum unit and the rotation of the image drum are performed by a mechanism shown below See Figure 2 6 a This mechanism is driven by a single pulse motor When the pulse motor turns left Counter clockwise the up down gear turns left in the direction of a and the up down lever see Figure 2 6 b moves up in the direction of a The up down lever pushes up the up down actuator of the image drum unit The image drum unit moves up as shown in Figure 2 6 b The image drum rotates freely EP drum gear Up down gear When the pulse motor see Figure 2 6 a turns right Counter clockwise the image drum gear turns left Counter clockwise and the up down gear one way gear is released The weight of
60. x okidata com 17 Ok a Service Guide OKIPAGE 8c Chapter 2 Operation 2 6 Correction of Color Deviation OKIPAGE 8c is equipped with an array of I D units which cannot be from generation of color deviations This mechanic below 1 Color deviations to be corrected 1 Color deviation in the X axis Positional error of the LED head 2 Diagonal color deviation Positional error of the LED head Color deviation in the Y axis Positional errors of the I D units and light receivers 2 Method of correction Print out the preset color chart compare the printed color chart by the original color chart and enter the amount of color deviation of each color from the operator panel or from the host computer OKIPAGE 8c calculates correction values from the entered values and changes the write timing of each color cyan magenta and yellow relative to black Copyright 1998 Okidata Division of OKI America Inc All rights reserved See the OKIDATA Business Partner Exchange BPX for any updates to this material http opx okidata com Page 18 Ok a Service Guide OKIPAGE 8c Chapter 2 Operation 2 7 Transfer Control according to Environmental Changes Transfer Control according to Environmental Changes Room Temperatures and Relative Humidities OKIPAGE 8c measures the room temperature and humidity It uses a room temperature sensor and a room humidity sensor An optimum transfer voltage is calculated usin
61. y Rear 28 3 3 2 Motor Fan 80 25 29 3 3 3 Paper Eject Assy 30 3 3 4 Cover Assy Stacker Guide Eject FD Assy 31 3 3 5 Upper Frame Assy 32 3 3 6 Plate Support Assemblies 33 9 9 Limiter 2way L R Plate Guide L 34 3 3 8 Cover 35 3 3 9 PCR PCB Assy 36 3 3 10 Motor Fan 37 3 3 11 PXF PCB PX4 PCB 38 3 3 12 Gear Heat Assy 39 Table of Contents Page 3 3 13 Main Motor B Assy 40 3 3 14 Gear One way Z30 41 3 3 15 Motor Assy Belt 42 9 9 16 Power Supply Unit Holder Inlet Sheet Insulation 43 3 3 17 Sensor Assy Box Toner 44 3 3 18 Square shaped Connector 45 3 3 19 Motor Pulse ID 46 3 3 20 One way Gears 47 3 3 21 Feeder Unit Front 48 3 3 22 Manual Feed Hopper Assy 49 3 3 23 Guide Paper Input Assy 50 3 3 24 Two Lever Input Sensors Lever 2nd Feed Sensor o1 3 3 29 Roller Registration Roller Assy Hopping 52 3 3 26 Hopping Roller Assy 53 3 3 27 PXU PCB PXM PCB Lever Resist Sensor 54 3 3 28 Paper End Lever 55 3 3 29 PCO PCB Operator Panel 56 3 3 30 Holder Gear Toner Assy 57 3 3 31 Plate Latch Lever FD Spring Latch Lever FD 58 3 3 32 Transfer Belt 59 3 3 33 High Voltage Power Supply Unit Bracket HV 60 Assy 3 3 34 Eraser Bracket Assy Eraser Bracket Assy 61 3 3 35 Shaft Link 62 9 9 96 Contact Bracket BL R Assy Contact Bracket CL R 63 Assy 3 3 37 Contac

OKIPAGE 8cn Led Printer

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