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All in One Printer
MFC-9420CN
Service Manual
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Confidential
A
PPENDIX 5
WIRING DIAGRA
M
A
PPENDIX 6
CIRCUIT DIAGRA
MS
NCU PCB (U.S.A
. model)
NCU PCB (Europe, Oceania, A
sia model)
NCU PCB (Japanese model)
POWER SUPPLY
PCB 100V, 127V
POWER SUPPLY
PCB 240V
A
PPENDIX 7
VIEWING T
HE EVENT
LOG FI
LE
11
13
Table of Contents
Main Page
Default Chapter
5
Table of Contents
5
Chapter 1 Parts Names & Functions
16
Equipment Outline
18
Control Panel
18
Control Panel
19
Components
21
Chapter 2 Specifications
22
General
24
General Specifications
24
Paper Specifications
25
Printable Area
26
Specifications List
27
Chapter 3 Theory of Operation
33
Overview
35
Printing Mechanism
36
Print System and Transfer System
41
1 ] Structure of the Machine
42
2 ] Basic Structure of the Printing System
43
3 ] Details of each Process
45
Laser ASSY PU
55
Paper Transportation System
56
Fusing Unit
57
Structure of the Control System
59
Basic Structure
59
1 ] Electrical System and Function
59
Electrical System and Function
59
Control System
66
1 ] Control of the Print Process
66
Main PCB (Video Controller PCB)
75
1 ] Outline
75
2 ] Circuit
75
Circuit
75
Outline
75
Scanner Mechanism
79
Chapter 4 Transfer of Data Left in the Machine to be Sent for Repair
84
Transferring Received Fax Data
84
Chapter 5 Disassembly/Reassembly and Lubrication
86
Disassembly/Reassembly
90
Safety Precautions
90
Tightening Torque
91
Preparation
92
How to Access the Object Component
92
Disassembly Flowchart
93
AC Cord
94
OPC Belt Cartridge
95
Paper Tray
95
Fusing Unit
96
Side Cover LR
100
Top Side L
101
ADF Unit
102
Scanner Unit
117
Pull Arm/Scanner Slider L, R
118
IS Lock Lever ASSY
119
Tray (TP)
119
Panel
120
Battery ASSY
124
Main PCB
124
Ncu Pcb Assy
126
Top Side R
127
Cleaning Roller Cover PU / Cleaning Roller PU
127
Top Cover
128
Center Cover
128
Right Side Cover PU
129
Side Cover LF
130
Interlock Switch PU (Front)
130
Waste Toner Auger PU
131
Waste Toner Agitator PU
131
Erase Lamp PU
132
Marker Sensor
133
Toner Density Sensor PU
133
Cleaning Roller Clutch PU
134
Main Motor PU
134
Fuser Clutch PU
135
TR Cam Clutch
136
Registration Clutch PU
136
Paper Feed Clutch PU
137
Developer Motor PU
137
Waste Toner Holder ASSY PU
138
Developer Clutch PU (DCLY/DCLM/DCLC/DCLK)
138
Developer Gear PU / Developer Drive ASSY PU
139
OPC Drive Gear ASSY PU
139
Main Drive Gear ASSY PU
140
Waste Toner Feeder PU
141
Toner Sensor PU (TPD)
142
Right Toner Guide PU
143
Laser ASSY PU / Laser Unit Fan ASSY PU
143
Inner Front Cover PU / Front Cover PU
145
Right Tray Guide PU
145
Engine Control Board PU
146
Power Supply Fan PU / Interlock Switch PU (Top, Paper Exit) / Power Supply Fan Duct PU
147
Speaker
148
Scanner Door Sensor
148
HV Power Supply PU
149
LV Power Supply PU / Power Supply Bracket PU ASSY
150
Fuser Connector PU
151
Toner Retract Solenoid PU (DESLY/DESLM/DESLC/DESLK) / Toner Retract Cam PU
152
Toner Sensor PU (TTR)
153
Toner Present Sensor PU
154
Belt Sensor
154
Left Tray Guide PU / Paper Size Sensor PU / Room Temp Thermistor PU
155
Left Toner Guide PU
156
Paper Exit Unit
157
Transfer Roller ASSY PU
158
Transfer Base ASSY PU
158
Registration Roller ASSY PU
159
Registration Actuator PU
159
Exit Guide ASSY PU / Exit Drive ASSY PU / Exit Idle Roller ASSY PU
160
Paper Sensor (PFUL)
161
Exit Roller ASSY PU / Paper Exit Actuator PU
162
Fuser Exit Actuator PU
163
Paper Sensor (PT2)
163
Discharging Brush PU
164
Back Cover Latch ASSY PU
165
Transfer Roller Guide PU
166
Paper Guide (A) PU
167
Paper Guide (B) PU
167
Paper Guide (C) PU / Paper Sensor (PT1, PEU) / OHP Sensor PU / Tray Empty Actuator PU
168
Paper Guide (D) PU
169
Paper Feed Roller / Separator Pad
169
Lubrication
170
Harness Routing
171
Chapter 6 Adjustments and Updating of Settings, Required after Parts Replacement
175
If You Replace the Main Pcb
177
EEPROM Customizing
177
EEPROM Parameter Initialization
177
ID Code Entry to the EEPROM
177
CIS Scanner Area Setting
178
Setting Which Allows the User to Select the Country
178
If You Replace the Engine Control Board Pu
180
Adjustment of the Guide B Position of Top Fuse Cover Fu
181
Periodic Maintenance Procedures
182
Replacement of OPC Belt Cartridge
182
Replacement of Fusing Unit
186
Replacement of Transfer Roller ASSY PU (120K KIT)
189
Replacement of Cleaning Roller PU (120K KIT)
191
Replacement of Paper Feed Roller and Separator Pad (120K KIT)
193
Replacement of Transfer Unit PU (120K KIT)
199
If You Replace the Opc Belt Cartridge
201
If You Replace the Fusing Unit
202
Chapter 7 Cleaning
204
Chapter 8 Maintenance Mode
206
Maintenance Mode for the Machine
208
Entry into the Maintenance Mode
208
List of Maintenance Mode Functions
209
List of Maintenance-Mode Functions
209
User-Access to the Maintenance Mode
210
Detailed Descriptions of Maintenance Mode Functions
211
Detailed Descriptions of Maintenance-Mode Functions
211
EEPROM Parameter Initialization (Function Code 01/91)
211
EEPROM Parameter Initialization (Function Mode 01/91)
211
Printout of Scanning Compensation Data (Function Code 05)
212
Printout of Scanning Compensation Data (Function Mode 05)
212
ADF Performance Test (Function Code 08)
214
ADF Performance Test (Function Mode 08)
214
Placement of CIS Unit in Position for Transportation (Function Code 06)
214
Placement of CIS Unit in Position for Transportation (Function Mode 06)
214
Test Pattern 1 (Function Code 09)
215
Test Pattern 1 (Function Mode 09)
215
1 ] Firmware Switch Setting (Function Code 10)
216
Firmware Switch Setting and Printout
216
2 ] Printout of Firmware Switch Data (Function Code 11)
218
Operation Check of LCD (Function Code 12)
219
Operation Check of LCD (Function Mode 12)
219
Operational Check of Control Panel PCB (Function Mode 13)
220
Operational Check of Control Panel PCB (Function Code 13)
220
Sensor Operational Check (Function Code 32)
221
Sensor Operational Check (Function Mode 32)
221
(Function Code 52)
222
EEPROM Customizing (Entering of the Country Code for Europe/Oceania.)
222
Received Data Transfer Function (Function Code 53)
223
Received Data Transfer Function (Function Mode 53)
223
Fine Adjustment of Scan Start/End Positions (Function Code 54)
225
Fine Adjustment of Scan Start/End Positions (Function Mode 54)
225
Acquisition of White Level Data and CIS Scanner Area Setting
227
Paper Feeding and Ejecting Test (Function Code 67)
227
Paper Feeding and Ejecting Test (Function Mode 67)
227
(Function Code 74)
228
EEPROM Customizing (Direct Entering of the Four-Digit Code.) (Function Mode 74)
228
Display of the Equipment's Log Information (Function Code 80)
229
Display of the Equipment's Log Information (Function Mode 80)
229
Cancellation of the Memory Security Mode
232
Cancellation of the Memory Security Mode (Not Applicable to the Japanese Model)
232
Machine Error Code Indication (Function Code 82)
232
Machine Error Code Indication (Function Mode 82)
232
Output of Transmission Log to the Telephone Line (Function Code 87)
232
Output of Transmission Log to the Telephone Line (Function Mode 87)
232
Hex Dump Mode
233
Indication of the Firmware Version
233
Engine Service Mode
234
Entry into the Engine Service Mode
234
List of Engine Service Mode Functions
235
Detailed Descriptions of Engine Service Mode Functions
236
Test Print (Code 31)
236
Next Care Information (Code 32)
239
Total Page (Code 34)
242
Tray Type (Code 33)
242
Each Image (Code 35)
243
Clear Care (Code 36)
244
Media Manage (Code 37)
244
Extend Media (Code 38)
245
Factory Mode (Code 39)
245
1 ] Margin Adjust (Code 43)
246
2 ] Life Period Set (Code 44)
247
3 ] NVRAM Tune up (Code 45)
248
4 ] NVRAM Initial (Code 46)
252
5 ] Total Page Set (Code 47)
252
6 ] each Image Set (Code 48)
253
7 ] Next Life Set (Code 49)
254
Chapter 9 Error Indication and Troubleshooting
256
Error Indication
257
Equipment Errors
257
1 ] Error Messages Appearing on the LCD
257
2 ] Error Codes Shown in "MACHINE ERROR X X" Messages
261
Communications Errors
271
Troubleshooting
275
Introduction
275
Precautions
275
Checking Prior to Troubleshooting
275
Troubleshooting Based on Problem Type
276
Software Setting Problems
276
2 ] Image Failure
279
3 ] Paper Transport Error
306
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