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Oki B721 Maintenance Manual
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B721 / B731 / MPS5501b
Maintenance Manual
070813A
2
Table of Contents
Table of Contents
4
Maintenance Manual
1
1 Configuration
7
System Configuration
8
Printer Configuration
9
Composition of Optional Items
10
Specifications
11
Interface Specifications
14
USB Interface Connectors and Cables
14
USB Interface Overview
14
USB Interface Signals
14
USB Interface Specifications
14
Network Interface Connector and Cable
15
Network Interface Overview
15
Network Interface Signals
15
Network Interface Specifications
15
USB Host Interface Connector
16
USB Host Interface Overview
16
USB Host Interface Signals
16
USB Host Interface Specifications
16
Wireless LAN Interface Overview
16
Wireless LAN Interface Specifications (Wireless Model Only)
16
Parallel Interface Connector and Cable
17
Parallel Interface Levels
17
Parallel Interface Overview
17
Parallel Interface Signals
17
Parallel Interface Specifications (Parallel Installed Model Only)
17
Installation
18
Cautions, and Do's and Don'ts
19
Unpacking Procedure
20
Printer Installation Instructions
21
List of Components and Accessories
22
Assembly Procedure
23
Assembly of the Printer Main Unit
23
Setting the Paper
27
Power Supply Conditions
29
Installation and Recognition Confirmation of Options
31
Printing of the Configuration Report
45
Connection Methods
46
Configuring Manually
52
Checking of Paper Used by the User
56
3 Component Replacement
57
Precautions on Component Replacement
58
Maintenance Tool
59
Method of Component Replacement
60
Transfer Roller
60
Cover-Rear-Blind
61
Fuser Unit
61
Cover Side-L
62
Cover Side-R
62
PU/CU-Board
63
How to Remove Battery(PU/CU-Board)
64
DC Motor (Hop) / DC Motor (ID)
65
Power Supply Unit
65
Motor FAN (ID) / Micro Switch
66
Motor FAN (PSU)
66
HV-Board / Motor-FAN
67
LED Assy
67
Plate-Assy-Duct
68
Frame-Assy-OP-Panel
69
LCD Panel
69
Cover-Assy-Front
70
Feeder-Assy-Regist / Clutch
71
TR-Assy-Front
72
TR-Assy-Rear
73
Cover-Assy-Stacker
73
Eject-Assy
74
DC Motor (Fuser)
76
Paper Feed Rollers
77
Paper Feed Rollers (MP Tray)
79
W-LAN Board (for Wireless Model Only)
81
Centro Board (for Centro Model Only)
82
Portions Lubricated
83
Maintenance Menus
86
Default Chapter
87
System Maintenance Menu (for Maintenance Personnel)
87
Maintenance Utility
88
User Maintenance Menu Functions
90
Maintenance Menu (for End-Users)
90
Operator Panel
105
Self-Diagnostic Mode
105
Entering Self-Diagnostic Mode (Level 1)
107
Exiting Self-Diagnostic Mode
107
Normal Self-Diagnostic Mode (Level 1)
107
Switch Scan Test
108
Motor and Clutch Test
110
Test Print
112
Consumable Counter Display
115
Factory-Shipping Mode Switching
116
Print Counter Display
116
Self-Diagnostic Function Setting
117
Contrast Adjustment
118
LED Head Serial Number Display
118
Buzzer Test
119
Printing on Stand-Alone Basis
119
Functions of Buttons When/After Power-On
120
Setup after Part Replacement
121
Notes on PU/CU Board Replacement
121
Manual Density Adjustment Setting
123
Boot Menu List
124
5 Cleaning
126
LED Lens Array Cleaning
128
Paper Feed Roller Cleaning
131
6 Troubleshooting Procedure
134
Important Notes to Start the Repair Work
135
Matters to be Checked before Taking Corrective Actions against Abnormalities
135
Precautions When Taking Corrective Actions against Abnormalities
135
Preparation for Troubleshooting
135
Troubleshooting Methods
136
LCD Message List
136
Operator Alarm
145
Service Call Error List
156
6.5.2 Preparation for Troubleshooting
163
Preparation for Troubleshooting
163
1) LCD Display Error
164
LCD Display Error
164
LCD Does Not Display Anything
164
2) Abnormal Operations of the Printer after the Power Is Turned on
165
Abnormal Operations of the Printer after the Power Is Turned on
165
Error Message Related to the Control Panel
165
RAM Checking" or "Initializing" Remains Displayed
165
Any Operation Does Not Start at All
165
Abnormal Sound Is Heard
166
Bad Odors Are Generated
167
Rise-Up Time Is Slow
167
Paper Feed Jam (Error 391: 1St Tray)
181
Jam Occurs Immediately after the Power Is Turned On. (1St Tray)
181
Jam Occurs Immediately after the Paper Feed Is Started. (1St Tray)
181
4) Feed Jam (Error 380)
182
Feed Jam (Error 380)
182
Jam Occurs Immediately after the Power Is Turned on
182
Jam Occurs Immediately after the Paper Feed Is Started
183
Paper Feed Jam (Error 390: MP Tray)
184
Jam Occurs Immediately after the Power Is Turned on
184
Jam Occurs Immediately after Paper Feed Is Started
184
6) Paper Running Jam (Error 381)
185
Paper Running Jam (Error 381)
185
Jam Occurs Immediately after the Power Is Turned on
185
Jam Occurs Immediately after a Paper Is Taken into Printer
186
Jam Occurs in the Middle of Paper Running Path
187
Jam Occurs Immediately after Paper Has Reached the Fuser
187
7) Paper Unloading Jam (Error 382)
188
Paper Unloading Jam (Error 382)
188
Paper Unloading Jam Occurs Immediately after the Power Is Turned on
188
Paper Unloading Jam Occurs after a Paper Is Taken into Printer
188
8) Two-Sided Printing Jam (Errors 370, 371, 372, 373 and 383)
189
Two-Sided Printing Jam (Errors 370, 371, 372, 373 and 383)
189
Paper Unloading Jam Occurs in the Middle of Paper Running Path
189
Two-Sided Printing Jam Occurs Immediately after the Power Is Turned on
189
Two-Sided Printing Jam Occurs During Taking in the Paper into Duplex Unit
189
9) Paper Size Error (Errors 400 and 401)
190
Paper Size Error (Errors 400 and 401)
190
Two-Sided Printing Jam Occurs During Transporting Paper Inside the Duplex Unit
190
Paper Is Not Supplied from the Duplex Unit to the Regist Roller
190
Jam Occurs When Paper End Is Located Near the IN1 Sensor
190
10) Fuser Unit Error (Errors 167 to 177)
191
Fuser Unit Error (Errors 167 to 177)
191
Error Occurs Immediately after the Power Is Turned on
191
Error Occurs Approx. 1 Minute after the Power Is Turned on
191
11) Motor Fan Error (Errors 122, 127, 128, 918)
192
The Low Voltage Power Supply Fan Does Not Rotate Immediately after the Power Is Turned on
192
12) Print Speed Is Slow. (Performance Is Low.)
193
Option Unit Cannot be Recognized
193
All Fans of the Printer Do Not Rotate
193
Print Speed Decreases
193
Option Try Unit Cannot be Recognized
193
14) LED Head Cannot be Recognized.(Errors 134)
194
Print Speed Is Slow. (Performance Is Low.)
193
13) Option Unit Cannot be Recognized
193
LED Head Cannot be Recognized. (Errors 134)
194
Errors 131 to 134 (LED HEAD Missing)
194
15) Toner Cartridge Cannot be Recognized.(Errors 543)
195
Toner Cartridge Cannot be Recognized. (Errors 543)
195
Error Caused by the Consumable Items
195
Error Caused by the Toner Sensor
195
16) Fuse Cut Error (Errors 155)
196
Fuse Cut Error (Errors 155)
196
Error Caused by the Defective Mechanism
196
17) Humidity Sensor Error (Error 123)
197
Humidity Sensor Error (Error 123)
197
Humidity Sensor Error
197
18) Wiring Diagram
198
Wiring Diagram
198
6.5.3 Troubleshooting the Abnormal Images
199
Troubleshooting the Abnormal Images
199
1) Color Has Faded-Out and Blurred Entirely
200
Color Has Faded-Out and Blurred Entirely. (Refer to Figure 6-2 A.)
200
Color Are Faded-Out and Blurred
200
2) Stain on White Print. (Refer to Figure 6-2 B.)
201
Stain on White Print (Overall Stain)
201
Stain on White Print (Partial Stain)
201
Stain on White Print. (Refer to Figure 6-2 B.)
201
White Print (Refer to Figure 6-2 C.)
202
White Print over Entire Page
202
4) Black Banding/Black Streaking in Vertical Direction
203
5) Periodic Abnormalities (Refer to Figure 6-2 E.)
203
Black Banding/Black Streaking in Vertical Direction
203
Periodic Abnormalities (Refer to Figure 6-2 E.)
203
Thin Vertical Line (with Color) (Refer to Figure 6-2 D.)
203
Thin Vertical Line (Without Color) (Refer to Figure 6-2 F.)
203
Periodic Abnormality Occurs in Vertical Direction
203
6) Solid Black Printing
204
Solid Black Printing
204
Solid Black Printing over the Whole Page
204
Image Quality Issues
205
Network Troubleshooting
206
Connection Error Occurs with the Web Browser
206
Print Operation Is Not Possible
210
Cannot Create Certificate
211
Installation of Certificate Is Not Possible
211
Other Questions
213
Restrictions When Using Internet Explore 7
215
Wireless Troubleshooting
216
Paper Cassette Switches and Paper Size Correlation Table
217
7 Connection Diagrams
218
Resistance Value Check
219
Parts Location
222
F/W Version Number
230
Maintenance Board Indication Stamp
230
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Oki B721 Specifications
General
Print Technology
LED
Resolution
1200 x 1200 dpi
Processor
533 MHz
Memory
256 MB
Connectivity
USB, Ethernet
Duplex Printing
Standard
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