Oki OKIPAGE8c User manual
OKIPAGE8c
LED Page Printer
MAINTENANCE
MANUAL
ODA/OEL/INT
1998,7,6
PREFACE
Thismaintenancemanualprovidesproceduresandtechniquesforthetroubleshooting,maintenance,and
repair of OKIPAGE 8c.
Thismanualiswrittenformaintenancepersonnel,butitshouldalwaysbeaccompaniedwiththeOKIPAGE
6cUser’sManualforproceduresforhandlingandoperatingOKIPAGE8c.Forrepairingeachcomponent
of OKIPAGE 8c, see the Troubleshooting manual.
[Notices]
The contents of this manual are subject to change without prior notice.
Althoughreasonableeffortshavebeentakeninthepreparation 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 OKI’s authorized technical service engineers.
CONTENTS
1. SPECIFICATIONS ....................................................................................... 1-1
1.1 Basic System Configuration ....................................................................................... 1-1
1.2 Printer Specifications ................................................................................................. 1-2
1.3 Option Specifications ................................................................................................. 1-3
1.4 Basic Specifications ................................................................................................... 1-4
2. OPERATION................................................................................................ 2-1
2.1 Main Control Board (PCR PCB)................................................................................. 2-2
2.2 Engine Control Board (PX4 PCB) .............................................................................. 2-5
2.3 Power/Board .............................................................................................................. 2-6
2.4 Mechanical Processes ............................................................................................... 2-7
2.4.1 Electrophotographic processing mechanism................................................ 2-8
2.4.2 Paper running process ................................................................................. 2-14
2.5 Sensors...................................................................................................................... 2-23
2.5.1 Paper related sensors .................................................................................. 2-23
2.5.2 Other sensors ............................................................................................... 2-24
2.6 Correction of Color Deviation ..................................................................................... 2-25
2.7 Transfer Control according to Environmental Changes
(Room Temperatures and Relative Humidities)......................................................... 2-25
2.8 Form Jam Detection................................................................................................... 2-26
2.9 Cover Opening........................................................................................................... 2-26
2.10 Toner Low Detection.................................................................................................. 2-27
2.11 Page Size Detection .................................................................................................. 2-28
2.12 Power-on Processing................................................................................................. 2-29
2.12.1 Self-diagnostic test ....................................................................................... 2-29
3. PARTS REPLACEMENT............................................................................. 3-1
3.1 Precautions for Parts Replacement ........................................................................... 3-1
3.2 Parts Layout............................................................................................................... 3-3
3.3 How to Change Parts................................................................................................. 3-7
3.3.1 Cover Assy Rear .......................................................................................... 3-8
3.3.2 Motor -Fan (80-25) ....................................................................................... 3-9
3.3.3 Paper Eject Assy .......................................................................................... 3-10
3.3.4 Cover Assy Stacker, Guide Eject FD Assy................................................... 3-11
3.3.5 Frame Assy Upper........................................................................................ 3-12
3.3.6 Plate Support Assy ....................................................................................... 3-13
3.3.7 Limmiter 2way (L), (R)/Plate Guide (L), (R).................................................. 3-14
3.3.8 Cover ............................................................................................................ 3-15
3.3.9 PCB Assy : PCR........................................................................................... 3-16
3.3.10 Motor Fan (CU)............................................................................................. 3-17
3.3.11 PXF PCB/PX4 PCB ...................................................................................... 3-18
3.3.12 Gear Heat Assy ............................................................................................ 3-19
3.3.13 Main Motor (A), (B)Assy ............................................................................... 3-20
3.3.14 Gear One-way (Z30)..................................................................................... 3-21
3.3.15 Motor Assy BT .............................................................................................. 3-22
3.3.16 Power Supply Unit, Holder Inlet, Sheet Insuration ....................................... 3-23
3.3.17 Sensor Assy Box Toner................................................................................ 3-24
3.3.18 Square-shaped Connector ........................................................................... 3-25
3.3.19 Hopping Motor.............................................................................................. 3-26
3.3.20 Gear One-way .............................................................................................. 3-27
3.3.21 Feeder Unit Front ......................................................................................... 3-28
3.3.22 Mannual Feed Hopper Assy......................................................................... 3-29
3.3.23 Guide Paper Input Assy................................................................................ 3-30
3.3.24 Lever Input Sensor ....................................................................................... 3-31
3.3.25 Roller Registration, Roller Assy Hopping ..................................................... 3-32
3.3.26 Roller Hopping.............................................................................................. 3-33
3.3.27 PXU PCB/PXM PCB, Lever Regist Sensor .................................................. 3-34
3.3.28 Paper End Lever........................................................................................... 3-35
3.3.29 PCO PCB (Operator Panel).......................................................................... 3-36
3.3.30 Holder Gear Toner Assy............................................................................... 3-37
3.3.31 Plate Latch Lever (FD), Spring Latch Lever (FD) ......................................... 3-38
3.3.32 Belt Cassette Assy ....................................................................................... 3-39
3.3.33 High Voltage Power Supply Unit, Bracket HV (BT) Assy ............................. 3-40
3.3.34 Eraser Bracket Assy, Eraser Bracket(KCM) Assy........................................ 3-41
3.3.35 Shaft Link...................................................................................................... 3-42
3.3.36 Contact (BL-R) Assy, Contact (CL-R) Assy.................................................. 3-43
3.3.37 Contact (BL-L) Assy, Contact (CL-L) Assy................................................... 3-44
3.3.38 Contact SB Assy........................................................................................... 3-45
3.3.39 PXC PCB...................................................................................................... 3-46
3.3.40 Heat Unit Assy.............................................................................................. 3-47
3.3.41 Oil Roller Assy.............................................................................................. 3-48
3.3.42 Lever Lock Heat (L) / (R), Guide Side Heat, Spring Lock............................. 3-49
3.3.43 PXL PCB ...................................................................................................... 3-50
3.3.44 Heat Unit Guide Assy ................................................................................... 3-51
3.3.45 Holder LED Assy, LED Head........................................................................ 3-52
4. ADJUSTMENTS .......................................................................................... 4-1
4.1 Maintenance Modes and Their Functions.................................................................. 4-1
4.1.1 User maintenance mode .............................................................................. 4-1
4.1.2 System maintenance mode.......................................................................... 4-5
4.1.3 Engine maintenance mode........................................................................... 4-7
4.2 Adjustments after Parts Replacement ....................................................................... 4-10
4.2.1 Confirm the LED head driving time............................................................... 4-10
4.2.2 Color deviation correction............................................................................. 4-12
5. PERIODIC MAINTENANCE ........................................................................ 5-1
5.1 Periodically Replaced Parts ....................................................................................... 5-1
5.2 Cleaning ..................................................................................................................... 5-1
5.3 Cleaning the LED Lens Array .................................................................................... 5-1
5.4 Cleaning the Pickup Roller......................................................................................... 5-1
6. TROUBLESHOOTING PROCEDURES ...................................................... 6-1
6.1 Troubleshooting Tips ................................................................................................. 6-1
6.2 Points to Check before Correcting Image Problems.................................................. 6-1
6.3 Tips for Correcting Image Problems .......................................................................... 6-1
6.4 Preparation for Troubleshooting ................................................................................ 6-2
6.5 Troubleshooting Flow................................................................................................. 6-2
6.5.1 LCD status message/trouble list................................................................... 6-2
6.5.2 LCD message troubleshooting ..................................................................... 6-15
6.5.3 Image troubleshooting .................................................................................. 6-28
7. WIRING DIAGRAM..................................................................................... 7-1
7.1 Resistance Check ...................................................................................................... 7-1
7.2 Program/Font ROM Location .....................................................................................7-5
8. PARTS LIST ................................................................................................ 8-1
Appendix A ....................................................................................................... A-1
Appendix B ....................................................................................................... B-1
Appendix C ....................................................................................................... C-1
1. SPECIFICATIONS
1 - 1
MMMM M MM M
LED head Discharging indicators
Centronics
interface
OKI HSP Controller Junction board Pulse motors
Engine controller
Low-voltage
power unit
Fixing unit
High-voltage
power unit Second tray
Belt unit
<Sensors, switches, and thermistors>
Paper width sensor
Form size detector (4 bits)
Form end sensor
FF form end
FF home switch
Form feed sensor 1
Form feed sensor 2
Write sensor
Ejection sensor
Toner Low (Y.M.C.K)
EP Up/Down (Y.M.C.K)
Waste toner sensor
Resist Up/Down
Cover open switch (High-voltage
interlock switch)
Heater temperature thermistor
Backup temperature thermistor
Environment temperature sensor
Environment humidity sensor
Oil Roller switch
Fixing unit interlock switch
Waste toner box switch
Y-EP unit M-EP unit C-EP unit B-EP unit
PSIMM
x2
interface
SIMM
x2
interface
Y EP M EP C EP K EP BELT HEATER REGIST FF
Operator panel
1. SPECIFICATIONS
1.1 Basic System Configuration
The basic system configuration of OKIPAGE 8c is illustrated in Figure 1.1.
Figure 1.1
1 - 2
1.2 Printer Specifications
This printer unit is composed with the following hardware.
• Electro-photographric processor
• Paper feeder
• Controller (CU part / PU Part)
• Operator panel
• Power board (High voltage part / PU part)
Figure 1-2 show the printer unit configuration.
Figure 1.2
Face-up Stacker Assy
Stacker Cover Assy
Rear Cover
Side Cover (L) Assy
Base Unit Operator Panel Assy
I/F Cover Assy
1 - 3
1.3 Option Specifications
Options available for OKIPAGE 8c are as follows.
(1) 2nd-Feeder
(2) RAM SIMM module (72 pin SIMM, 4MB/8MB/16MB/32MB)
* Make sure to use a set of 2 of the same volume size modules.
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