Oki C7500n User manual

Oki Data CONFIDENTIAL
Name
C7550/C7350,C7500/C7300
Color LED Page Printer
Maintenance Manual
[041124A]
No.01
41955801TH
C7550/C7350,C7500/C7300 (ODA/OEL/INT)
Maintenance Manual
1
174
2004-04-23
Akio Kikuchi Tomoyo Sugiyama
41955801TL C7550/C7350,C7500/C7300 Disassembly for Maintenance
41955801TR C7550/C7350,C7500/C7300 RSPL
Yoshinori Fujisawa
7 2004-04-23 HP9-0004 Change format Tomoyo Sugiyama Akio Kikuchi
8 2004-09-08 SE2-0248 Add to C7550/C7350 Takayuki Oshima Hiroshi Ueno

41955801TH Rev.8 2 /
Oki Data CONFIDENTIAL
1 2002-10-23
2 2002-11-29 NP11 Haruyama
3 2003-06-06 7 158 Part No. of the Control Panel Bezel ME4 Ueda
4 2003-07-14 Add CU(VE Version) CN11 Yamanaka
5 2003-12-19 Add PU(VE Version) NP32 Ishizuka
6 2004-01-26 21,159 Partial change CN11 Yamanaka
7 2004-03-05 Partial change NP32 Ishizuka
8 2004-09-08 Add to C7550/C7350 NP51 Oshima
Rev.No. Date No.
Corrected items
Page Description of change
Person in
change
Document Revision History

41955801TH Rev.8 3 /
Oki Data CONFIDENTIAL
PREFACE
This manual describes the procedures of the maintenance of the C7550/C7350,C7500/C7300 of printers.
The document is produced for maintenance personnel use. For details on the procedures for handling the
C7550/C7350,C7500/C7300 of printers, see its user documentation.
Note! • The descriptions in this manual are subject to change without prior notice.
• In preparing the document, efforts have been made to ensure that the information in it is accurate.
However, errors may be crept into the document. Oki Data assumes no responsibility for any
damage resulting from, or claimed to be the results of, those repairs, adjustments or modifica-
tions to the printers which are made by users using the manual.
• The parts used for the printers are sensitive and, if handled improperly, may be damaged. It is
strongly recommended that the products are maintained by maintenance men registered with
Oki Data.
•Oki Data strongly recommends that you do NOT connect our LED page printers to an
uninterruptiblePower Supply (UPS). For further information, please contact Oki Data directly at
800-OKIDATA or www.okidata.com.

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Oki Data CONFIDENTIAL
CONTENTS
1. CONFIGURATIONS ......................................................................................... 7
1.1 System Configuration....................................................................................................... 7
1.2 Printer Configuration ........................................................................................................8
1.3 Option Configuration ........................................................................................................ 9
1.4 Specifications ................................................................................................................. 10
2. PARTS REPLACEMENT ................................................................................ 12
2.1 Precautions in Replacing Parts ...................................................................................... 12
2.2 Parts layout .................................................................................................................... 14
2.3 Replacing Parts..............................................................................................................20
2.3.1 Top Cover ......................................................................................................... 22
2.3.2 LED Head / LED Spring / Post-Guide............................................................... 23
2.3.3 Top Cover Unit ................................................................................................. 24
2.3.4 Control Panel Assy/ Control Panel Bezel/ LED Control PWB/ Toner Sensors/
Stacker Full Sensor/ Control Panel/ Control Panel Tape Harness/ Eject Rollers . 25
2.3.5 Top Cover Handle/ Top Cover Latch/ Top Cover Latch Spring ........................ 26
2.3.6 Eject Guide Assy .............................................................................................. 27
2.3.7 Cassette Assy/ Front Cover Assy/ Front Cover Inner Baffle ........................... 28
2.3.8 Retard Pad Assy/ Retard Pad Assy Spring ...................................................... 29
2.3.9 Feed Roller and Nudger Roller ......................................................................... 30
2.3.10 Rear Cover ....................................................................................................... 31
2.3.11 Face-Up Tray.................................................................................................... 32
2.3.12 Left Side Cover ................................................................................................. 33
2.3.13 Right Side Cover .............................................................................................. 34
2.3.14 Multipurpose Tray Assy/ Multipurpose Tray Cover Assy/ Links/
Multipurpose Tray Top Cover/ Multipurpose Tray Drive Gear .......................... 35
2.3.15 Drum Contact Assys ......................................................................................... 36
2.3.16 Media Thickness Sensor Assy......................................................................... 37
2.3.17 Registration Roller Assy (A)/ Registration Drive Gear (A) ................................ 38
2.3.18 Registration Roller Assy (B) ............................................................................. 39
2.3.19 Registration Clutch and Registration Motor Assy ............................................. 40
2.3.20 Main Cooling Fan ............................................................................................. 41
2.3.21 Color Registration Sensor Assy........................................................................ 42
2.3.22 Duplex Guide Assy ........................................................................................... 43
2.3.23 Electrical Chassis Cooling Fan ......................................................................... 44
2.3.24 Printer Engine Controller PWB ......................................................................... 45
2.3.25 Printer Unit Chassis .......................................................................................... 46
2.3.26 Entrance Cassette Sensor Actuator ................................................................. 47
2.3.27 Entrance Sensor PWB...................................................................................... 48
2.3.28 Entrance MT Sensor Actuator / Entrance Belt Sensor Actuator /
Entrance Waste Chassis Sensor Actuator ...................................................... 49
2.3.29 Fuser Exit Roller ............................................................................................... 50
2.3.30 Exit Sensor Assy .............................................................................................. 51
2.3.31 Fuser Latching Handle (L) ................................................................................ 52
2.3.32 Belt Motor Assy ................................................................................................ 53
2.3.33 Fuser Latching Handle (R) ............................................................................... 54
2.3.34 Main Motor Assy ............................................................................................... 55
2.3.35 Main Feeder Drive Motor .................................................................................. 56
2.3.36 Contact Assy/ Left Plate Assy .......................................................................... 57
2.3.37 Low Voltage Power Supply............................................................................... 58
2.3.38 High voltage power supply ............................................................................... 59
2.3.39 Main Feed Assy ................................................................................................ 60
2.3.40 Cassette/ Left Guide Assy ................................................................................ 61
2.3.41 Cassette/ Right Guide Assy.............................................................................. 62
2.3.42 Fuser Unit ......................................................................................................... 63
2.3.43 Belt Unit ............................................................................................................ 64

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Oki Data CONFIDENTIAL
2.3.44 Duplex Unit ....................................................................................................... 65
2.3.45 Guide Rails (L) and (R)..................................................................................... 66
2.3.46 Duplex Transport Assembly ............................................................................. 67
2.3.47 CU Assy............................................................................................................ 69
2.3.47 CU Assy............................................................................................................ 69
3. Adjustment .................................................................................................... 72
3.0 System Maintenance MENU .......................................................................................... 72
3.0.1 ID Check Pattern Printing ( " TEST PRINT MENU " item )............................... 73
.......................................................................................................................... 73
3.1 Maintenance Mode and Functions ................................................................................. 73
3.1.1 Maintenance menu ........................................................................................... 73
3.1.2 Engine maintenance mode ............................................................................... 75
3.1.2.1 Operator panel .................................................................................. 75
3.1.2.2 Normal self-diagnostic mode (Level 1).............................................. 75
3.1.2.2.1 Entering self-diagnostic mode (Level 1) ............................ 76
3.1.2.2.2 Exiting the self-diagnostic mode ....................................... 76
3.1.2.3 Switch scan test ................................................................................ 76
3.1.2.4 Motor clutch test ................................................................................ 80
3.1.2.5 Test print ........................................................................................... 82
3.1.2.6 Initializing NVM ................................................................................. 86
3.1.2.7 Displaying the consumables counter ................................................ 87
3.1.2.8 Displaying the consumables continuation counter ............................ 87
3.1.2.9 Panel display details ......................................................................... 88
3.1.3 Various print jobs with single printer unit attached with a controller ................. 93
3.2 Adjustment After Replacing Parts .................................................................................. 94
3.2.1 Precautions in replacing the engine control board ........................................... 94
3.2.2 Precautions in replacing EEPROM................................................................... 94
3.2.3 Replacing EEPROM after replacing the CU board ........................................... 95
3.2.4 Destination Setting (Checking Metod: Printing Demo Page) ............................ 95
3.2.5 Recovery Flash ROM data on CU board .......................................................... 96
3.2.6 Notes on replacing Oki LAN8100e or CU boards equipped with Oki LAN8100e96
3.3 Adjusting the Density ..................................................................................................... 96
3.4 Paper Thickness Detection Sensitivity Adjustment and Media Thickness Detection
Value Check................................................................................................................... 97
3.4.1 Applicable Operating Systems and Interfaces, and File Required ................... 97
3.4.2 Setting .............................................................................................................. 98
3.4.2.1 Menu Setting ..................................................................................... 98
3.4.2.2 Media Setting .................................................................................. 100
3.4.2.3 Sensitivity Adjustment ..................................................................... 101
3.4.2.4 Actions for NG Sensitivity Adjustment............................................. 102
3.4.3 Inputting the density of the calibration chip for density detection ................... 103
3.4.3.1 Density Adjustment Menu Setting ................................................... 103
3.4.4 Electronic Serial Number Input ....................................................................... 105
4. regular maintenance ................................................................................... 106
4.1 Parts Replaced Regularly ............................................................................................ 106
4.2 Cleaning ....................................................................................................................... 106
4.3 Cleaning the LED Lens Array ...................................................................................... 106
4.4 Cleaning the Pick-up Roller ......................................................................................... 106
5. Troubleshooting Procedures ..................................................................... 107
5.1 Precautions before troubleshooting ............................................................................. 107
5.2 Precautions before handling an abnormal image ........................................................ 107
5.3 Precautions upon handling an abnormal image........................................................... 107
5.4 Preparing for Troubleshooting ..................................................................................... 108

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Oki Data CONFIDENTIAL
5.5 Troubleshooting Procedure.......................................................................................... 108
5.5.1 LCD message list ........................................................................................... 109
5.5.2 Preparing for troubleshooting ......................................................................... 115
5.5.3 Troubleshooting for abnormal images ............................................................ 126
5.6 Fuse check................................................................................................................... 141
5.7 Life Counter Tool ......................................................................................................... 141
6. CONNECTION DIAGRAM ............................................................................ 142
6.1 Resistance Checks ...................................................................................................... 142
6.2 Program/Font ROM Layouts ........................................................................................ 146
APPENDIX A INTERFACE SPECIFICATIONS ................................................. 154
1. Parallel Interface Specifications ................................................................................... 154
1.1 Parallel Interface............................................................................................. 154
1.2 Parallel Interface Connector and Cable.......................................................... 154
1.3 Parallel Interface Level ................................................................................... 154
1.4 Timing Charts ................................................................................................. 155
1.5 Parallel I/F Signals.......................................................................................... 156
2. Universal Serial Bus (USB) Interface Specifications.................................................... 157
2.1 USB Interface ................................................................................................. 157
2.2 USB Interface Connector and Cable .............................................................. 157
2.3 USB Interface Signals .................................................................................... 157
APPENDIX B 2ND/3RD TRAY MAINTENANCE .............................................. 158
1. Parts Replacement ...................................................................................................... 158
1.1 Cover Idle Roller Assy .................................................................................... 158
1.2 PCB ................................................................................................................ 159
1.3 Feeder Drive Assy .......................................................................................... 160
APPENDIX C C7100/7300/7350/9300/9500 SERIES ERROR MESSAGES .... 161
1. C7100/7300/7350/9300/9500 Series (Error messages) .............................................. 161
2. C7100/7300/7350/9300/9500 Series
(Error messages : Related to Color, Media Detect) ... 168
3. C7100/7300/7350/9300/9500 Series
(Warning messages : Related to usage, media) ....... 171
4. C7100/7300/7350/9300/9500 Series (Warning messages : Job Account) .................. 172
5. C7100/7300/7350/9300/9500 Series (Other Warning) ................................................ 173

41955801TH Rev.8 7 /
Oki Data CONFIDENTIAL
MM M MMMMM
LED Head
Centronics I/F
USB I/F
2 × Option Slots
Junction Board
Pulse Motor
Engine Control
Low Voltage
Power Unit
Fuser
Unit
High Voltage
Power Unit 2nd/3rd Tray
Duplex
Unit
Belt
Unit
<Sensors, Switches and Thermistors>
Paper size sensor (4 bits)
Paper empty sensor
Paper near empty sensor
MT paper empty sensor
FF home switch
Loading sensor 1
Loading sensor 2
C-ID
Unit
M-ID
Unit
Y-ID
Unit
K-ID
Unit
C ID M ID Y ID K IDBelt Heat
MT/
Registration Hopping
Operator Panel
2 × ROM
DIMMs
3 × RAM
DIMM
IDE
I/F(HDD)
DC Fan
Note
Note Option Slot: LAN Card
< advanced Sensors,>
Media Thickness Detection
Density Detection
Color Misalignment Detectin
1. CONFIGURATIONS
1.1 System Configuration
Figure 1-1 shows the system configuration of the C7550/C7350,C7500/C7300 of printers.
Figure 1-1

41955801TH Rev.8 8 /
Oki Data CONFIDENTIAL
1.2 Printer Configuration
The inside of the printers is composed of the followings:
• Electrophotographic Processor
• Paper Paths
• Controller Block (CU and PU)
• Operator Panel
• Power Units (High Voltage Unit and Low Voltage Unit)
Figure 1-2 shows the printer configuration.
Figure 1-2
A
A
B
B
A
A
B

41955801TH Rev.8 9 /
Oki Data CONFIDENTIAL
1.3 Option Configuration
The followings are available as options on the C7550/C7350,C7500/C7300 of printers.
(1) 2nd Tray/ 3rd Tray
(2) Duplex Unit
(3) Expansion Memory 64/128/256/512 MB
(4) Internal Hard Disk
(5) Ethernet Board
Note: Don’t use one for
C9200/C9400
Note: Don’t use one for
C9200/C9400
Note: Don’t use one for
C9200/C9400
Note: Don’t use one for
C9200/C9400
Note: Don’t use one for
C9200/C9400

41955801TH Rev.8 10 /
Oki Data CONFIDENTIAL
1.4 Specifications
(1) External Dimensions Height: 430mm Width: 430mm Length: 620mm
(2) Weight 42 kg
(3) Papers Type: Ordinarypaper, 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 tray55 kg to 151 kg (64 to 176g/m2)
Front feeder 55 kg to 172 kg (64 to 203g/ m2)
(4) Print Speed C7500/C7300
Color:20 pages per minute (Transparency: 8 pages per minute)
Monochrome: 24 pages per minute (Transparency: 12 pages per minute)
Postal Card, Label, Thick Paper: 12 pages per minute
C7550/C7350
Color:24 pages per minute (Transparency: 8 pages per minute)
Monochrome: 26 pages per minute (Transparency: 12 pages per minute)
Postal Card, Label, Thick Paper: 12 pages per minute
(5) Resolution 600 ×600 dots per inch (C7550/C7350)
1200 ×1200 dots per inch (C7550/C7350)
(6) Power Input 115 - 127 V , 220 - 240 V
(7) Power Consumption Peak: 1500W Normal Operation: 500W (5% duty)
Idle: 150W Power Saving Mode: 45W or less
(8) Frequency 50Hz or 60Hz ±2Hz
(9) Noise Operation: 56 dB (Without second tray)
Standby: 45 dB
Power Saving: 43 dB
(10) Consumable Life Toner Cartridge: 5,000 pages (5% duty) (each of Y, M, C and K)
Large-Capacity Toner Cartridge: 10,000 pages (5% duty)
(each of Y, M, C and K)
Image Drum: 30,000 pages (5% duty, Continuous printing)
(each of Y, M, C and K)
(11) Parts Replaced Periodically Fuser Unit Assy: Every 60,000 pages
Belt Cassette Assy: Equivalent of60,000pages (3 pages/job)