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FW780
Ricoh FW780 Service Manual
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4.4
CHARGE CORONA UNIT REMOVAL
1.
Remove the drum unit.
2.
Remove the ground springs [A].
3.
Remove the charge corona unit [B] (2 connectors).
NOTE
:
When reinstalling the charge corona unit, make sure that the 2
connectors (C for the charge corona, G for the grid bias) are set
properly.
[A]
[A]
[B]
A163
5-16
SM
149
151
Table of Contents
Table of Contents
15
Default Chapter
1
Service Manual
1
Important Safety Notices
13
Overall Machine Information
23
Specifications
25
Paper Path
27
Drum Processes
28
Mechanical Component Layout
30
Drive Layout
31
Electrical Component Layout
32
Detailed Section Descriptions
35
Drum
37
Drum Characteristics
37
Drum Drive
38
Charge
39
Overview
39
Charge Corona Circuit
40
Corona Unit Ventilation
41
Exposure
42
Overview
42
Basic Operation (Manual Feed)
43
Paper and Original Feed
43
Original Jam Check Timing
45
Drive Mechanism
46
Fl Regulator Control
47
Manual ID Control
48
Development
49
Overview
49
Drive Mechanism
50
Cross-Mixing
51
Toner Density Control
52
Recovery from Toner (Near) End Condition
53
Toner Near End Condition
53
Toner Density Sensor
54
Basic Concept
55
Development Bias
55
Manual Image Density Bias
55
Toner Supply
56
Image Transfer and Paper Separation
57
Image Transfer
57
Paper Separation
57
Pre-Transfer Lamp (Ptl)
57
Pick-Off Mechanism
58
T/S Corona Circuit
59
Cleaning
60
Overview
60
Collection of Used Toner
61
Quenching
62
Fusing and Paper Exit
63
Overview
63
Drive Mechanism
64
Fusing Unit Drive
64
Fusing Circuit Operation
65
Fusing Temperature Control
65
Overheat Protection
66
Temperature Control
67
Energy Saver Function
70
Fusing Entrance Guide Height
71
Roll Cutting Rail
72
Installation
73
Environment
75
Machine Level
76
Minimum Space Requirements
76
Power Source
77
Installation Procedure
78
Installation Procedure
86
Service Tables
91
Preventive Maintenance Schedule
93
Pm Table
93
Regular Pm Procedure
96
Service Tables
99
Test Points
99
Variable Resistors
99
Service Tools
100
Service Program Mode
100
Service Program Mode Access Procedure
100
Service Program Mode Table
102
Input/Output Check Mode
119
Input/Output Check Mode Access Procedure
119
Input Check Mode Table
120
Output Check Mode Table
121
Power on Initial Setting Mode
122
Jam Code List
123
Access Procedure
123
Jam Code Table
123
Special Tools and Lubricants
125
Service Remarks
126
Drum
126
Drum Unit
126
Charge Corona
127
Development
128
Optics
128
Cleaning Unit
129
Transfer and Separation
129
A Pressure Roller Evaluation Procedure
130
Fusing Unit
130
Original Feed
131
Others
131
Paper Feed
131
Roll Feeder
131
Exterior Covers
135
Left Lower Cover
135
Left Side Cover Removal
135
Left Upper Cover
135
Rear Cover Removal
135
Right Lower Front, Right Lower Middle, and Right Lower Rear Covers
135
Right Side Cover Removal
135
Right Upper Cover
135
Optics
136
Original Feed Unit Removal
136
Exposure Glass Removal
137
Exposure Lamp Removal
137
Fiber Optics Array Removal
138
Light Sensor Replacement
139
Development Unit Removal
140
Developer Removal
142
Toner Density Sensor Replacement
143
Ptl Replacement
144
Bias Voltage for Image Area
145
Development Bias Voltage Adjustment
145
Bias Voltage for Non-Image Area
146
Drum Unit
147
Drum Unit Removal
147
Drum Replacement
148
Cleaning Blade Replacement
149
Charge Corona Unit Removal
150
Charge Corona Wire Replacement
151
Pick-Off Pawl Unit Removal
152
Grid Voltage Adjustment
153
Drum Current Adjustment
154
Charge Current Adjustment
156
Transfer Current Adjustment
157
Separation Current Adjustment
158
Fusing
160
Fusing Unit Removal
160
Hot Roller Replacement
162
Pressure Roller Replacement
163
Hot Roller Stripper Unit Replacement
164
Pressure Roller Stripper Unit Replacement
164
Pressure Roller Thermistor Replacement
164
Fusing Thermofuse Replacement
165
Hot Roller Thermistor Replacement
165
Fusing Temperature Adjustment
166
T & S Corona Unit
167
T & S Corona Unit Removal
167
Preparation
168
Transfer and Separation Corona Wire Replacement
168
Separation Corona Wire Replacement
169
Transfer Corona Wire Replacement
169
Others
170
Ozone Filter Replacement
170
Anticondensation Heater Installation
171
Copy Quality Adjustment
172
Light Sensor Adjustment
173
Image Bias Adjustment
174
Registration Adjustment
175
Toner Density Adjustment
175
Troubleshooting
177
Copy Quality Troubleshooting
179
Low Image Density
179
Uneven Copy Image
180
Dirty Background
181
Black Line or Band
182
Entirely Blank Copy
183
Paper Creasing
184
Service Call Condition
185
SC Code E-1: Exposure Lamp Abnormal
185
SC Code E-2: Fusing Thermofuse Open
185
SC Code E-3: Hot Roller Thermistor Open
186
SC Code E-4: Hot Roller Thermistor Short
186
SC Code E-5: Pressure Roller Thermistor Open
186
SC Code E-6: Pressure Roller Thermistor Short
187
SC Code E-7: Fusing Overheat
187
SC Code E-8: Fusing Warm-Up Error
188
SC Code E-9: Toner Density Sensor Abnormal
188
SC Code E-10: Main Motor Abnormal
189
SC Code E-11: Toner Density Sensor Adjustment Error
189
Blown Fuse Table
190
Power Supply Unit
190
Roll Feeder
191
Specifications
193
Mechanical Component and Drive Layout
194
Electrical Component Descriptions
195
Mechanical Operation
197
Basic Operation
197
Cutter Unit Opening and Closing Mechanism
199
Cutter Operation
200
Service Tables
201
Blown Fuse Condition
201
Test Points
201
Exterior Cover Removal
209
Front Cover Removal
209
Left and Right Cover
209
Replacement and Adjustment
209
Cutter Unit Removal
210
Paper Feed Roller Replacement
211
Paper Feed Motor Timing Belt Tension Adjustment
212
5 MM (for 420 to 1189 MM
213
Cut Length Adjustment
213
Roll Feed Paper Skew Adjustment
214
Table of Contents
217
1 Overall Machine Information
227
Specifications
227
Paper Path
229
Mechanical Component
230
Drive Layout
232
Electrical Component Descriptions
233
2 Detailed Section Descriptions
237
Drum
237
Drum Drive
237
Exposure
238
Paper and Original Feed (A252 Only)
238
Development
240
Toner Density Control
240
Fusing and Paper Exit
241
Overview (A252 Copier)
241
3 Installation
243
Installation Requirements
245
Environment
245
Machine Level
246
Minimum Space Requirements
246
Power Source
247
Copier
248
Installation Procedure
249
Table (A)
256
Copy Tray (A836-10)
258
4 Service Tables
269
Service Tools
271
Service Program Mode
271
Input/Output Check Mode
279
Jam Code List
281
Jam Code Table
281
Service Remarks
285
Ac Drive Board
285
5 Replacement and Adjustment
287
Optics
289
Original Feed Unit Removal (A252 Only)
289
Exposure Glass Removal (A252 Only)
290
Fiber Optics Array Removal (A252 Only)
290
Exposure Lamp Removal
291
Light Sensor Replacement (A252 Only)
292
Synchro-Cut Length Adjustment (A252 Only)
293
Drum Unit
294
Drum Unit Removal
294
Fusing
295
Fusing Unit Removal
295
T & S Corona Unit
297
Transfer and Separation Corona Wire Replacement
297
Copy Quality Adjustment
299
Registration Adjustment
299
6 Troubleshooting
301
Service Call Conditiion
303
Sc Code E-14: Zero Cross Signal Detection Abnormal
303
Sc Code E-15: Main Switch Abnormal (U.s.a. Version Only)
303
Blown Fuse Table
304
Power Supply Unit
304
Detailed Section Descriptions/Detailed Section Descriptions
309
Default Chapter
324
Specifications
324
Paper Path
325
Mechanical Components
326
Electrical Components
328
Detailed Section Descriptions
331
Detailed Section Descriptions
333
Exposure
333
Original Positioning
333
Paper and Original Feed (B048 Only)
333
Scanning
334
Start Key Enable
335
Toner Density Control
336
Recovery from Toner End Condition
337
Used Toner Collection
338
Fusing and Paper Exit
339
Overview
339
Hot Roller Temperature Control
340
Temperature Control
340
Energy Star Compliant Machines (All the Destination)
341
Installation
343
Installation Requirements
345
Environment
345
Machine Level
346
Minimum Space Requirements
346
Power Source
347
Installation Procedure
349
B047 Copier Only (Step 22 and 23)
356
B048 Copier Only (Step 21)
356
Table (B)
357
Copy Tray (B)
359
Roll Feeder1 and 2 (B435/B)
363
Roll Cutting Rail (B)
372
Service Call Conditions
413
Sc Code Descriptions
413
SC Code E-1: Exposure Lamp Abnormal
413
SC Code E-2: Fusing Thermofuse Open
413
SC Code E-3: Hot Roller Thermistor Open
413
SC Code E-4: Hot Roller Thermistor Short
414
SC Code E-5: Pressure Roller Thermistor Open
414
SC Code E-6: Pressure Roller Thermistor Short
414
SC Code E-7: Fusing Overheat
414
SC Code E-10: Main Motor Abnormal
415
SC Code E-11: Toner Density Sensor Adjustment Error
415
SC Code E-8: Fusing Warm-Up Error
415
SC Code E-9: Toner Density Sensor Abnormal
415
SC Code E-13: Total Counter Abnormal
416
SC Code E-14: Zero Cross Signal Detection Abnormal
416
SC Code E-15: Main Switch Abnormal
416
SC Code E-17: Unstable Fusing Temperature
416
SC Code E-18: Fusing Lamp Continuous Light
416
Blown Fuse Table
417
AC Drive Board
417
Europe Version
417
Power Supply Unit
417
Roll Feeder Unit
419
Overall Machine Information
421
Specifications
421
Detailed Section Descriptions
423
Mechanical Operation
423
Basic Operation
423
Drive Mechanism
425
Roll Edition Detection
425
Cutter Operation
426
Replacement and Adjustment
427
Cutter Unit Replacement
427
Roll Feed Leading Edge Sensor Replacement
428
Roll Feed Unit Removal
429
Roll Feed Clutch Replacement
430
Roll Feed Motor Replacement
431
Roll End Sensor Replacement
432
Cut Length Adjustment
433
Preset Cut : Adjustment Standards: 3 MM
433
Side Registration Adjustment
434
Receiving Tray Cover Assembly
480
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Operating Instructions
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Ricoh FW780 Specifications
General
Brand
Ricoh
Model
FW780
Category
Printer
Language
English
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