Okidata C7000 Service Manual
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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)
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
31
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
....3.3.5 Top Cover Handle / Top Cover Latch / Top Cover
Latch Spring
....3.3.6 Eject Guide Assy 54
....3.3.7 Cassette Assy / Front Cover Assy / Front Cover Inner
Baffle
....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)
....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
....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
52
53
55
64
75
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)
........(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)
........(5) Vertical White Belt or Line, or Uneven-Color Belt or
Line (Figure 6-2 F)
........(6) Poor Fusing (Ink spreads or peels when touched with
fingers)
........(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
143
146
147
148
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
Preface
Page: 1
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. Oki l
Data 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 be l
maintained 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
1.1 System Configuration
Figure 1-1 shows the system configuration of the C7000 Series of printers.
Page: 2
Copyright 1999, Okidata, Division of OKI America, Inc. All rights reserved.
1.2 Printer Configuration
The inside of the printer is composed of the following:
Electrophotographic Processorl
Paper Pathsl
Controller Block (CU and PU)l
Operator Panell
Power Units (High Voltage Unit and Low Voltage Unit)l
Figure 1-2 shows the printer configuration.
Service Guide - C7000 Series
Chapter 1 Specifications
Page: 3
Copyright 1999, Okidata, Division of OKI America, Inc. All rights reserved.
Service Guide - C7000 Series
1.3 Option Configuration
The following options are available for the C7000 Series of printers.
(1) 2nd Tray / 3rd Tray
(2) Duplex Unit
Page: 4
Chapter 1 Specifications
(3) Expansion Memory
64/128/256 MB
(4) Internal Hard Disk
(5) OkiLAN 6200e NIC
Copyright 1999, Okidata, Division of OKI America, Inc. All rights reserved.
Service Guide - C7000 Series
Chapter 1 Specifications
1.4 Specifications
(1) External Dimensions Height: 16.9 in. Width: 16.9 in. Length: 24.4 in.
(2) Weight 92.5 lbs.
(3) Papers Type: Ordinary paper, Transparencies
(Recommended: MLOHP01)
Size: Postal card, Legal 13" or 14", Executive, A4,
A5, B5, A6 (Only
the 1st tray and the front feeder support A6 and
postal-card
sizes.)
Weight: 1st tray 55 kg to 90 kg (64 to 105g/m 2 )
Front feeder 55 kg to 140 kg (64 to 163g/ m 2 )
(4) Print Speed Color: 12 pages per minute (Transparency: 5 pages
per minute)
Monochrome: 20 pages per minute (Transparency:
12 pages per minute)
Postal Card, Label, Thick Paper: 8 pages per minute
(5) Resolution (C7200) = 600 × 600 -//- (C7400) 1200 x 1200 dots
per inch
Page: 5
(6) Power Input 100VAC ±10%
(7) Power Consumption Peak: 1300W Normal Operation: 400W (5% duty)
Idle: 110W Power Saving Mode: 45W or less
(8) Frequency 50Hz or 60Hz ±2%
(9) Noise Operation: 54 dB (Without second tray)
Standby: 45 dB
Power Saving: 43 dB
(10) Consumable Life Toner Cartridge: 10,000 pages (5% duty) (each of Y,
M, C and K)
Image Drum: 30,000 pages (Continuous printing)
(each of Y, M, C and K)
(11) Parts Replaced Periodically Fuser Unit Assy: Every 60,000 pages
Transfer Belt Assy: Equivalent of 60,000 pages (3
pages/job)
(12) Temperatures and Relative
Humidities
Temperature
Temperature conditions
Fahrenheit Celsius Remarks
Operating 50 to 89.6 10 to 32 17 to 27 Celsius (Temperatures to assure
full color print 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 with drum and without toner
Delivery (1 month max.) -20 to 122 -29 to 50 with drum and toner
Humidity
Humidity condition
Fahrenheit Celsius Remarks
Operating 20 to 80 25 50% to 70% (for assurance of full-color
printout quality)
Non-operating 10 to 90 26.8 Power off
Storage 10 to 90 35
Delivery 10 to 90 40
(13) Printer Life 600,000 pages (on a A4-size basis) or five years
Copyright 1999, Okidata, Division of OKI America, Inc. All rights reserved.
Service Guide - C7000 Series
Chapter 2 Operation
2.0 Operation
Page: 6
The C7000 Series of printers, tandem color electrophotographic page printers, adopt technologies such as an LED array, OPC, dry single-component
non-magnetic developing, roller transfer and heat-compression fusing. A black-writing printing method by shedding light on print areas is used.
Copyright 1999, Okidata, Division of OKI America, Inc. All rights reserved.
Service Guide - C7000 Series
Chapter 2 Operation
2.1 Main board (CRM PWB)
Figure 2-2 provides the block diagram of the main control board (CRM PWB).
Page: 7
(1) CPU
The CPU is PowerPC750, a 64-bit bus RISC processor, which inputs an 80-MHz CLK
(=BUS CLK), and operates at 400MHz that is five times the input.
(2)
Secondary Cache SRAM
SRAM is included as secondary cache of the CPU on the board.
(3)
ROM
ROM is to be inserted into the three 168 pin DIMM slots. The slot A is for program ROM
and the slot B is for Japanese kanji fonts. The slot C is not assigned.
(4)
RAM
RAM is to be inserted into the four 168 pin DIMM slots. The DIMMs must be fitted in
descending labeled type No. order into the slots 1, 3, 2 and 4.
SDRAM DIMM Specifications:
Speed: PC100 or more
Capacity: 64/128/256 MB
Configuration: Without parity. Without ECC. SPD information is required. Number of chips
contained = 8 or 16.
(5) EEPROM
EEPROM, an 8-pin DIP package, is to be inserted into the IC socket. The EEPROM is of
16 Kbits for 3.3V power supply, and settings for controlling the controller block are stored
in it.
(6) Flash ROM
A 2-Mbyte flash ROM is surface-mounted on the CRM board. The flash ROM is
composed of four 256-k-by-16bit chips, and fonts and macros can be stored in it.
(7) Memory control LSI (CI)
A 696-pin BGA package ASIC made by NEC, which is equipped with a cooling heat sink
and mainly controls a CPU I/F, memory, video data compression and decompression,
and a PU-video I/F.
(8) Interface control LSI (C2)
A BGA package ASIC made by Toshiba, which controls a PU command I/F, operator
panel I/F, IDE I/F, Centronics I/F, USB I/F, PCI I/F, EEPROM and a SPD (SDRAM DIMM)
I/F.
(9)
IDE HDD
An IDE connector is surface-mounted on the board to which an IDE HDD assembled
Additional Board: (connected to PCI BUS) / Ethernet Board
Copyright 1999, Okidata, Division of OKI America, Inc. All rights reserved.
2.2 Engine Controller Board (K71 PWB)
Service Guide - C7000 Series
Chapter 2 Operation
Page: 8
The engine control block (PU) is controlled by the engine controller board (K71 PWB) which consists of a CPU (MSM66Q577), general LSI chip, flash ROM,
EEPROM, pulse motor drivers and a video memory (see Figure 2-4).
(1) CPU
This, a 16-bit CPU with an AD converter containing 126-Kbyte ROM (OKI MSM66Q577), controls the entire system.
(2) General LSI
This LSI (MG63P011-001LA), which is contained in the printer engine control block, has 4 Mbits of video memory, and functions such as controller-engine video
interfacing, LED interfacing, motor control, sensor input, video memory control, main scan color misalignment correction, skew correction and high voltage power
supply control.
(3) Flash ROM
The flash ROM (29F400-70) is of 4-Mbits, and PU programs are stored in it.
(4) EEPROM
The EEPROM (NM93C66N-NW) is of 4-Kbits, and mounted on the board with an IC socket. Correction values are stored in it.
(5) Pulse Motor Driver
The pulse motor driver (A2919SLBTR, A2918SWV) drives the eight pulse motors to revolve the EP and transport media.
(6) SRAM
This SRAM (62256LFP-7LL) is used as working memory of the CPU.
Copyright 1999, Okidata, Division of OKI America, Inc. All rights reserved.
Service Guide - C7000 Series
Chapter 2 Operation
2.3 Power Units
Page: 9
There are a low voltage power unit consists of an AC filter circuit, low voltage power circuit and heater driver circuit, and a high voltage power unit organizes a
high voltage power circuit.
(1) Low voltage power supply circuit.
This circuit generates the following voltages.
Output voltage Use
+3.8 V CU LSI
+3.8 V LED head
+5 V Logic circuit power supply, PU CPU
+34 V Motor, drive voltage and power supply voltage for high voltage power
supply
-12 V OP Amp, High voltage power supply
(2) High voltage power supply circuit
This circuit generates the following voltages of not less than +34V, which are required for electrophotographic process, according to control sequences from the
controller board.
Output Voltage Use Remarks
CH -900V to 1.4KV Voltage to charging roller
DB -100 to 400V/ +300V Voltage to developing roller
SB Y, M, C, and K:
Voltage to toner supply roller
-100V to -700V
TR 0Kv to 7KV Voltage to transfer roller Variable
Copyright 1999, Okidata, Division of OKI America, Inc. All rights reserved.
Service Guide - C7000 Series
Chapter 2 Operation
2.4 Mechanical Processes
Figure 2-4 shows the mechanical processes of the C7000 Series of printers.
Page: 10
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