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C321
Oki C321 Maintenance Manual
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44951501TH Re
v
.2
8-3
Oki Data CONFIDENTIAL
8.
CONNECTION DIAGRAMS
Unit
Circuit diagram and composition
P
ar
t dra
wing
Resistance v
alue
Fuser motor
IP1
Both ends of IP1:
1
or less
F
eed motor
M
1
2
3
4
Between pins 1 and 2:
3.4
Between pins 3 and 4:
3.4
2nd f
eed motor
M
1
2
3
4
Between pins 1 and 2:
3.4
Between pins 3 and 4:
3.4
200
202
Table of Contents
Default Chapter
4
Table of Contents
4
1 Configuration
6
System Configuration
7
Printer Configuration
8
Optional Items
9
Specifications
10
Interface Specifications
14
USB Interface Specifications
14
USB Interface Connector and Cable
14
USB Interface Overview
14
USB Interface Signals
14
Network Interface Specifications
15
Network Interface Connector and Cable
15
Network Interface Overview
15
Network Interface Signals
15
2 Description of Operation
16
Electrophotographic Process Mechanism
17
Printing Process
21
3 Installation
33
Cautions, and Do's and Don'ts
34
Unpacking Procedure
35
Printer Installation Instructions
36
List of Components and Accessories
37
Assembly Procedure
38
Assembly of the Printer Main Unit
38
Connection of the Power Cable
42
Installation and Recognition Confirmation of an Option
44
Printing of Menumap
53
Connection Methods
54
Checking of Paper Used by the User
56
4 Replacement of Parts
57
Notes on Replacement of Parts
58
Part Replacement Procedure
60
Belt Unit
60
Fuser Unit
61
Left Side Cover
61
Right Side Cover
62
Face-Up Tray
62
Rear Cover
63
LED Assembly. and LED Assembly Springs
63
Image Drum Fan and ZHJ Board
64
CU/PU PCB and Low-Voltage Power Supply
64
Top Cover Assembly
66
Top Cover and LED Head Cable Assembly
66
Operator Panel Assembly
67
Board IBB and LCD
67
MPT Assembly
68
High-Voltage Power Supply Board
70
Guide-Ejection Assembly, Fuser Connector Assembly and Color-Registration Assembly
71
Frame-MPT Assembly and Feeder Assembly
72
Side-L Assembly, Side-R Assembly and Base Assembly ⑦
73
Feed Rollers
74
Locations to Lubricate
75
5 Maintenance Menus
87
System Maintenance Menu (for Maintenance Personnel)
88
Maintenance Utility
90
User Maintenance Menu Functions
92
Maintenance Menu (for End-Users)
92
Self-Diagnostic Mode
93
Various Types of Printing on Stand-Alone Basis
110
Button Functions at Power-On
111
Setup after Part Replacement
112
Notes on CU/PU Board Replacement
112
Manual Density Adjustment Operation
114
Printer ADMIN MENU
115
6 Periodic Maintenance
119
Cleaning
120
LED Lens Array Cleaning
121
Pick-Up Roller Cleaning
123
Pinter Internal Cleaning
124
7 Troubleshooting
126
Before Troubleshooting
127
Points to Check before Dealing with Image Troubles
127
Precautions for Dealing with Image Troubles
127
Preparation for Troubleshooting
127
Troubleshooting Procedure
128
LCD Messages List
128
Preparation for Troubleshooting
149
LCD Display Trouble
150
LCD Displays Nothing
150
Please Wait
150
Error Message Display Related to Operator Panel
151
RAM CHECK or INITIALIZING Persists
151
No Operations Start
151
Abnormal Sound Is Heard
152
Startup Time of Printer Is Long
153
Paper Feed Jam (Error Code 391: 1St Tray)
164
Jam Occurs Immediately after the Power Is Turned On. (1St Tray)
164
Jam Occurs Immediately after the Paper Feed Is Started. (1St Tray)
164
Feed Jam (Error Code 380)
165
Jam Occurs Immediately after the Power Is Turned on
165
Jam Occurs Immediately after the Paper Feed Is Started
166
Paper Feed Jam (Error Code 390: Multipurpose Tray)
166
Jam Occurs Immediately after the Power Is Turned on
166
Jam Occurs Immediately after Paper Feed Is Started
167
Paper Running Jam (Error Code 381:)
168
Jam Occurs Immediately after the Power Is Turned on
168
Jam Occurs Immediately after a Paper Is Taken into Printer
168
Jam Occurs in the Middle of Paper Running Path
169
Jam Occurs Immediately after Paper Has Reached the Fuser
170
Paper Unloading Jam (Error Code 382)
170
Paper Unloading Jam Occurs Immediately after the Power Is Turned on
170
Paper Unloading Jam Occurs after a Paper Is Taken into Printer
171
Paper Unloading Jam Occurs in the Middle of Paper Running Path
171
Two-Sided Printing Jam (Error Code: 370, 371, 372, 373, 383)
172
Two-Sided Printing Jam Occurs Immediately after the Power Is Turned on
172
Two-Sided Printing Jam Occurs During Taking in the Paper into Duplex Unit
172
Two-Sided Printing Jam Occurs in the Process of Reversing Paper
173
Two-Sided Printing Jam Occurs During Transporting Paper Inside the Duplex Unit
173
Paper Is Not Supplied from the Duplex Unit to the Regist Roller
173
Paper Size Error (Error Code 400)
174
Jam Occurs When Paper End Is Located Near the IN1 Sensor
174
Error Occurs During the up Movement of the ID Unit
174
Error Occurs During the down Movement of the ID Unit
175
Fuser Unit Error (Error 170 to 177)
175
Error Occurs Immediately after the Power Is Turned on
175
Error Occurs Approx. 1 Minute after the Power Is Turned on
175
The Low Voltage Power Supply Fan Does Not Rotate Immediately after the Power Is Turned on
176
All Fans of the Printer Do Not Rotate
176
Print Speed Is Slow. (Performance Is Low.)
177
Print Speed Decreases
177
Option Unit Cannot be Recognized
177
Option Try Unit Cannot be Recognized
177
LED Head Cannot be Recognized. (Error Code 131, 132, 133, 134)
177
Service Call 131 to 134 (LED HEAD Missing)
177
Toner Cartridge Cannot be Recognized. (Error Code 540, 541, 542, 543)
178
Error Caused by the Consumable Items
178
Error Caused by the Toner Sensor
178
Error Caused by the Defective Mechanism
179
Fuse Cut Error (Error Codes 150 to 155)
179
Humidity Sensor Error (Error Code 123)
180
Troubleshooting of Image Problems
182
Color Is Faint and Fades Across Pages (See Fig. 7-2 A)
183
Color Is Faint and Fades
183
The White Area of Printed Pages Is Dirty (See Fig. 7-2 B)
184
The White Area of Printed Pages Is Dirty (Partially)
184
The White Area of Printed Pages Is Dirty (All Over)
184
Printed Pages Are Blank (See Fig. 7-2 C)
185
A Printed Pages Are Entirely Blank
185
Vertical Lines Are Produced in Printed
186
Fine Lines (Colored) (See Fig. 7-2 D)
186
Fine Lines (White) (See Fig. 7-2 F)
186
Print Quality Problems Appear Periodically (See Fig. 7-2 E)
186
Print Quality Problems Appear Vertically and Periodically
186
Color Misregistration Is Significant
187
The Message "Adjusting Color" Displayed at Power on Stays for a Short Time
187
Although the REG ADJUST TEST Result of the Engine
187
Black Filled-In Printing
187
Printed Pages Are Filled-In Black Entirely
187
Color Jobs Are Printed in Monochrome, Not in Color
188
False Setting of the Limited-Color Printing Menu
188
Network Troubleshooting
189
Connection Errors Occur by Use of a Web Browser
189
Has a Certificate Been Created
190
Is the SSL/TLS Setting Set to on
190
Check the Version Number of the Web Browser
191
A Certificate Cannot be Created. (for C321/C331/C531)
192
Check the os (Operating System)
192
Has a Printer Been Created
192
Is the IPP Setting Set to Enable
192
Not All the Required Entry Fields Are Filled in
192
Print Operation Is Not Possible (for C321/C331/C531)
192
A Certificate Cannot be Installed. (for C321/C331/C531)
193
A CSR Has Been Deleted
193
The Network Card Has Been Initialized
193
The Printer IP Address Has Been Changed
193
The Printer Is Printing
193
Install an Intermediate Certificate
194
Can Encrypted Printing be Performed Without IPP
195
Communication Time When the Encryption Function Is Enabled
195
How to Change the Port Number
195
Other Questions (for C321/C331/C531)
195
The Error Message "The Security Certificate was Issued by a
195
Time Required for Creation of a Certificate
195
What will Happen if SSL/TLS Is Set to off after a Certificate Is
195
The Error Message "Name of Security Certificate Is Invalid or Does Not Match the Site Name" Is Displayed
196
Warning Indication When SSL Is Enabled for Self-Signed Certificates
197
Fuse Check
198
8 Connection Diagrams
199
Resistance Value Checking
200
Layout of Parts
203
Firmware Revision Numbers
217
ROM Control Numbers
217
Checking and Indication of the Revision Number
218
Stamp of Maintenance Board Indication
218
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User Guide
94 pages
4
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Oki C321 Specifications
General
Brand
Oki
Model
C321
Category
Printer
Language
English
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