Name: Oki MC770
Brand: Oki
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45584901TH Rev.1

5-44 /

Oki Data CONFIDENTIAL

[F400] CU board abnormality

Classiﬁcation Contents

Circuit related service call CU board abnormality

Check item Measures

CU board Board check

Replacement part Measure

CU board

Specifications/System List16
HDD Memory Map17
System List18
Disassembly and Replacement19
Fax Unit (GD-1340)21
Caster Stand22
Spacer23
Offline Stapler24
Self-Diagnostic Mode25
Service UI29
SERVICE MODE] Screen30
Input Check (Test Mode 03)31
Output Check (Test Mode 03)32
Test Print Mode (Test Mode 04)33
Operation Procedure in Adjustment Mode (05)34
Test Print Pattern in Adjustment Mode (05)36
Operation Procedure in Setting Mode (08)40
Assist Mode (3C)42
HDD Assist Mode (4C)45
Functions47
File System Recovery Mode (5C)49
Functions50
SRAM Clear Mode (6C)54
Functions55
Operation Procedure56
List Printing57
Error History59
Image Related Adjustment64
Performing Density Correction65
Image Dimensional Adjustment66
Image Dimensional Adjustment in the Copy/Printer/Fax Function67
Image Quality Adjustment (Copying Function)68
Image Quality Adjustment (Printing Function)70
Gamma Balance Adjustment (Black Mode)72
Color Balance Adjustment74
Adjustment of Faint Text76
Maximum Toner Density Adjustment (Special Paper 3)77
Pureblack/Puregray" Threshold Adjustment (Twin Color Mode)78
Toner Limit Threshold Adjustment79
Sharpness Adjustment80
Thin Line Width Lower Limit Adjustment81
LED Emission Level Adjustment82
Density Adjustment of Graphic Lines (1200 Dpi)83
Auto Trapping Width/Density Adjustment (PS)84
Image Quality Adjustment (Scanning Function)85
Density Adjustment86
Background Adjustment (Color Mode)87
Background Adjustment (Black/Grayscale)88
Sharpness Adjustment89
RGB Conversion Method Selection90
Adjustment of the Capacity and Image Quality of Slimpdf91
Surrounding Void Amount Adjustment92
JPEG Compression Level Adjustment93
General Descriptions94
Collection of Debug Logs with a USB Device95
Error Code List97
Service Call98
Error in Internet FAX / Scanning Function101
Printer Function Error110
Web Page Related Error/Communication Error with External Application112
MFP Access Error113
Maintenance Error114
Network Error115
Error History118
Diagnosis and Prescription for each Error Code120
Paper Jam in Finisher Section121
Finisher Related Service Call125
Communication Related Service Call133
Circuit Related Service Call136
Other Service Call138
Error in Internet FAX / Scanning Function156
Printer Function Error168
Web Page Related Error/Communication Error with External Application170
MFP Access Error174
Maintenance Error176
Network Error181
Other Errors191
Removal and Installation of PC Boards/Hdd192
CU Board Cover194
Hard Disk (HDD)196
SRAM Board <For CU Board>197
FAX Unit198
Precautions, Procedures and Settings for Replacing PC Boards and HDD199
HDD Fault Diagnosis200
Precautions and Procedures When Replacing the HDD202
Precautions and Procedures When Replacing the CU Board207
Precautions and Procedures When Replacing the PU Board217
License Re-Registration Using the One-Time Dongle218
Precautions for Installation of GP-1070 and Disposal of HDD/ Board220
Remote Service221
Setting Procedure224
Order Sheet Format234
Service Notification238
Items to be Notified244
Firmware Updating256
Firmware Updating with USB Device258
Update Procedure260
Patch Updating with USB Device268
Update Procedure270
Firmware Updating with PWA-DWNLD-JIG2275
Writing the Data to the Download Jig (PWA-DWNLD-JIG2)276
System Firmware278
Firmware Updating with K-PWA-DLM-320280
FAX Unit Firmware (GD-1340)281
Confirmation of the Updated Data283
When Firmware Updating Fails284
Flow Chart for Correcting USB Update Failure285
Backup FUNCTION287
Backup Files288
AES Data Encryption Function Setting291
Setting Procedure292
Procedure for Disabling Data Encryption Function296
High Security Mode297
Precautions298
External Counters299
Details of the Signals301
Notices303
Self-Diagnosis Code (03/04/05/08 Code)304
Adjustment Mode (05) Codes307
Setting Mode (08) Codes379

Brand	Oki
Model	MC770
Category	All in One Printer
Language	English

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