Service Manuals, User Guides, Schematic Diagrams or docs for : oki Printers LED 8c 8c_mm
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OKIPAGE8c
LED Page Printer
ODA/OEL/INT
1997.11.19
MAINTENANCE
MANUAL
PREFACE
This maintenance 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
6c 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 is 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 any 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 Setting 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 ..................................................................... 6-14
6.5.3 Image troubleshooting .................................................................................. 6-27
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.
LED head Discharging indicators
1.1
Operator panel
Centronics
interface Pulse motors
Controller Junction board Y EP M EP C EP K EP BELT HEATER REGIST FF
OKI HSP
M M M M M M M M
PSIMM SIMM
SPECIFICATIONS
x2 x2
interface interface
Paper width sensor
Engine controller Form size detector (4 bits)
Basic System Configuration
Form end sensor
FF form end
FF home switch
Form feed sensor 1
Low-voltage Form feed sensor 2
1-1
power unit Write sensor
Ejection sensor
High-voltage Second tray Toner Low (Y.M.C.K)
power unit EP Up/Down (Y.M.C.K)
Fixing unit Waste toner sensor
Resist Up/Down
Cover open switch (High-voltage
interlock switch)
Heater temperature thermistor
Backup temperature thermistor
The basic system configuration of OKIPAGE 8c is illustrated in Figure 1.1.
Environment temperature sensor
Environment humidity sensor
Oil Roller switch
Fixing unit interlock switch
Waste toner box switch
Belt unit Y-EP unit M-EP unit C-EP unit B-EP unit
Figure 1.1
1.2 Printer Specifications
This printer unit is composed with the following hardware.
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