Oki C7200 User manual

C7000 Series Color LED
Page Printer
SERVICE
MANUAL
This manual describes the procedures for the maintenance of the C7000 Series of printers.
The document is produced for maintenance personnel use. For details on the procedures for
handling the C7000 Series of printers, see its user documentation.

Table of Contents Page
Service Guide - C7000 Series
Preface 1
1 Specifications
1.1 System Configuration 2
1.2 Printer Configuration 3
1.3 Option Configuration 4
1.4 Specifications 5
2 Operation
2.0 Operation 6
2.1 Main board (CRM PWB) 7
2.2 Engine Controller Board (K71 PWB) 8
2.3 Power Units 9
2.4 Mechanical Processes 10
....2.4.1 Electrphotographic process 11
........(1) Electrophotographic processes 12
........(2) Charging 13
........(3) Exposure 14
........(4) Developing 15
........(5) Transfer 16
........(6) Fusing 17
........(7) Cleaning - waste toner area 18
........(8) Cleaning - transfer belt 19
....2.4.2 Paper running process 20
........(1) Paper Feed from Tray 21
........(2) Paper Feed from Multi-Purpose Tray (MT) 22
........(3) Transport Belt 23
........(4) Driving and Up-and-Down Movements of I/D Unit 24
........(5) Fuser Unit and Paper Ejection 25
........(6) Duplex Unit 26
2.5 Sensor 27
....2.5.1 Paper related sensors 28
....2.5.2 Other sensors 29
2.6 Color Misalignment Correction 30
2.7 Transfer control Responds to Environmental Changes
(Room Temperature and Relative Humidities)
31
2.8 Paper Jam Detection 32
2.9 Cover-Open 33
2.10 Toner Low Detection 34
2.11 Page Size Detection 35
2.12 Operation at Power-on 36
2.13 Color Misalignment Detection 37
2.14 Version Read of Units Replaced Periodically 38
2.15 Life Count for Units Replaced Periodically 39
2.16 Toner Consumption Detection 40
3 Disassembly

Table of Contents Page
3.0 Precaution in Replacing Parts 41
3.1 Precaution in Replacing Parts 42
3.2 Parts Layout 43
....Top Cover Assy 44
....Printer Unit 45
....Cassette Guide Assy (L), (R) 46
....Duplex Unit 47
3.3 Replacing Parts 48
....3.3.1 Top Cover 49
....3.3.2 LED Assy / LED Assy Spring 50
....3.3.3 Top Cover Unit 51
....3.3.4 Control Panel Assy / Control Panel Bezel / LED Control
PWB / Toner Sensors / Stacker Full Sensor / Control Panel /
Control Panel Tape Harness / Eject Rollers
52
....3.3.5 Top Cover Handle / Top Cover Latch / Top Cover
Latch Spring
53
....3.3.6 Eject Guide Assy 54
....3.3.7 Cassette Assy / Front Cover Assy / Front Cover Inner
Baffle
55
....3.3.8 Retard Pad Assy / Retard Pad Assy Spring 56
....3.3.9 Feed Roller and Nudger Roller 57
....3.3.10 Rear Cover 58
....3.3.11 Face-Up Tray 59
....3.3.12 Left Side Cover 60
....3.3.13 Right Side Cover 61
....3.3.14 Multi-purpose Tray Assy / Links 62
....3.3.15 Drum Contact Assys 63
....3.3.16 Registration Roller Assy (A) / Registration Drive Gear
(A)
64
....3.3.17 Registration Roller Assy (B) 65
....3.3.18 Registration Clutch and Registration Motor Assy 66
....3.3.19 Main Cooling Fan 67
....3.3.20 Color Registration Sensor Assy 68
....3.3.21 Duplex Guide Assy 69
....3.3.22 Electrical Chassis Cooling Fan 70
....3.3.23 Printer Engine Controller PWB 71
....3.3.24 Printer Unit Chassis 72
....3.3.25 Entrance Cassette Sensor Actuator 73
....3.3.26 Entrance Sensor PWB 74
....3.3.27 Entrance MT Sensor Actuator and Entrance Belt
Sensor Actuator
75
....3.3.28 Fuser Exit Roller 76
....3.3.29 Exit Sensor Assy 77
....3.3.30 Fuser Latching Handle (L) 78
....3.3.31 Belt Motor Assy 79

Table of Contents Page
....3.3.32 Fuser Latching Handle (R) 80
....3.3.33 Main Motor Assy 81
....3.3.34 Main Feeder Drive Motor 82
....3.3.35 Contact Assy / Left Plate Assy 83
....3.3.36 Low Voltage Power Supply 84
....3.3.37 High Voltage Power Supply 85
....3.3.38 Main Feed Assy 86
....3.3.39 Cassette / Left Guide Assy 87
....3.3.40 Cassette / Right Guide Assy 88
....3.3.41 Fuser Unit 89
....3.3.42 Belt Unit 90
....3.3.43 Duplex Unit 91
....3.3.44 Guide Rails (L) and (R) 92
....3.3.45 Duplex Transport Assembly 93
....3.3.46 CU Assy 94
4 Adjustments
4.0 Adjustments 95
4.1 Maintenance Modes and Their Functions 96
....4.1.1 Maintenance Menu 97
....4.1.2 Engine maintenance mode 98
........4.1.2.1 Operator panel 99
........4.1.2.2 General self-diagnosis mode (level 1) 100
............4.1.2.2.1 Entering self-diagnosis mode (level 1) 101
............4.1.2.2.2 Exiting self-diagnosis mode 102
........4.1.2.3 Switch scan test 103
........4.1.2.4 Motor and clutch test 104
........4.1.2.5 Test printing 105
........4.1.2.6 NVM initialization 106
........4.1.2.7 Consumable Counter Display 107
........4.1.2.8 Consumable Counter Display - Continuos 108
........4.1.2.9 Error Messages and their Details 109
....4.1.3 CRM board adjustments 110
........4.1.3.1 Short plug settings 111
........4.1.3.2 Printing Menu Reports 112
4.2 Adjustments after Parts Replacement 113
....4.2.1 Precautions in replacing engine controller board 114
....4.2.2 Precautions in replacing EEPROM 115
....4.2.3 EEPROM replacement after CRM board replacement 116
4.3 Color Balance Adjustment 117
5 Period Maintenance
5.0 Periodic Maintenance 118
5.1 Parts Replaced Periodically 119
5.2 Cleaning 120
5.3 Cleaning LED Lens Array 121
5.4 Cleaning Pickup Roller 122

Table of Contents Page
6 Troubleshooting Procedures
6.1 Before Troubleshooting 123
6.2 Checking before Troubleshooting Image Problems 124
6.3 Precautions in Troubleshooting Image Problems 125
6.4 Preparation for Troubleshooting 126
6.5 Troubleshooting 127
....6.5.1 LCD messages list 128
........Table 6-1-1 Operator Alarms (1/2) 129
....6.5.2 LCD Preparation for Troubleshooting 130
........(1) The printer does not operate properly after power-on. 131
........(2) Jams 132
............(2)-1 Paper Loading Jam (1st Tray) 133
............(2)-2 Paper Loading Jam (Multi-Purpose Tray) 134
............(2)-3 Paper feed jam 135
............(2)-4 Paper Exit Jam 136
............(2)-5 Duplex Jam 137
........(3) Paper Size Error 138
........(4) Image Drum Unit (ID) Up-and-Down Operation Error 139
........(5) Fusing Unit Error 140
........(6) Motor Fan Error 141
....6.5.3 Troubleshooting image problems 142
........(1) Light or Faded Image on Whole Page, or Color
Misalignment on Whole Page (Figure 6-2 A)
143
........(2) Dirty Background (Figure 6-2 B) 144
........(3) Blank Page (Figure 6-2 C) 145
........(4) Vertical Belt or LIne (Black or Color Belt, or Black or
Color Line) (Figure 6-2 D)
146
........(5) Vertical White Belt or Line, or Uneven-Color Belt or
Line (Figure 6-2 F)
147
........(6) Poor Fusing (Ink spreads or peels when touched with
fingers)
148
........(7) Defective Image of Regular Interval (See Figure 6-2 E) 149
........(8) Missing Image 150
........(9) Color Misalignment 151
........(10) Color Different from Original One 152
........Figure 6-3 153
7 Wiring Diagram
7.1 Resistance Check 154
7.2 Program/Font ROM Location 155
8 Parts List
Main Assembly - Figure 8-2 156
Main Assembly - Table 8-1 (1/3) 157
Main Assembly - Table 8-1 (2/3) 158
Main Assembly - Table 8-1 (3/3) 159
Top Cover Assembly - Figure 8-2 160

Table of Contents Page
Top Cover Assembly - Table 8-2 161
Printer Unit Chassis Figure 8-3 162
Printer Unit Chassis - Table 8-3 163
Paper Tray Guide - Figure 8-4 164
Paper Tray Guide - Table 8-4 165
Duplex Unit - Figure 8-5 166
Duplex Unit - Table 8-5 167
Centronics Parallel Interface 168
B 2nd/3rd Tray Maintenance
1. Parts Replacement 169
....1.1 Cover Idle Roller Assy 170
....1.2 PCB 171
....1.3 Feeder Drive Assy 172
2. C7000 2nd/3rd Tray Parts List 173
........Table 6-1-1 Operator Alarms (2/2) 174

Service Guide - C7000 Series
Chapter 0 Introduction
Page: 1
Preface
This manual describes the procedures for the maintenance of the C7000 Series of printers.
The document is produced for maintenance personnel use. For details on the procedures for handling the C7000 Series of printers, see its user documentation.
Notes!
The descriptions in this manual are subject to change without prior notice.l
In preparing the document, efforts have been made to ensure that the information in it is accurate. However, there may be errors in the document. OkilData assumes no responsibility for any damage resulting from, or claimed to be the results of, those repairs, adjustments or modifications to the printers
which are made by users using the manual.
The parts used for the printers are electrostatic sensitive and, if handled improperly, may be damaged. It is strongly recommended that the products belmaintained by Oki Data Authorized Repair Centers Oki Data.
Copyright 1999, Okidata, Division of OKI America, Inc. All rights reserved.

Service Guide - C7000 Series
Chapter 1 Specifications
Page: 2
1.1 System Configuration
Figure 1-1 shows the system configuration of the C7000 Series of printers.

Copyright 1999, Okidata, Division of OKI America, Inc. All rights reserved.