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Ricoh FT8780 manual available for free PDF download: Service Manual
Ricoh FT8780 Service Manual (388 pages)
Brand:
Ricoh
| Category:
Copier
| Size: 5 MB
Table of Contents
Important Safety Notices
2
Prevention of Physical Injury
2
Health Safety Conditions
2
Observance of Electrical Safety Standards
3
Safety and Ecological Notes for Disposal
3
Table of Contents
4
Overall Machine Information
19
Specifications
20
Copy Processes Around the Drum
23
Mechanical Component Layout
25
Copier
25
Ardf
26
Electrical Component Descriptions
27
Copier
27
Ardf
32
Drive Layout
33
Paper Path
34
Single Sided Copy -- Copy Face down
34
Duplex Mode (1St Side)
34
Duplex Mode (2Nd Side)
35
Image Overlay Mode (1St Side)
35
Image Overlay Mode (2Nd Side)
36
Detailed Section Descriptions
37
Process Control
38
Overview
38
Image Control
40
Latent Image Control
40
Image Density Control
41
Process Control Data Initialization
42
Drum Potential Sensor Calibration
43
Drum Conditioning
44
Vsg Adjustment
44
Lamp Intensity Sensor Calibration
44
Charge Corona Current Adjustment
45
Vr Measurement
46
VD Correction
46
L Correction
46
01 Measuring
49
ADS Adjustment
50
Compensations During Copy Cycle
51
L Compensation
51
02 Measuring
52
Drum
53
Overview
53
Drum Heater Control
54
Drum Charge
55
Charge Corona Unit
55
Corona Unit Ventilation
56
Corona Wire Cleaner
57
Charge Corona Power Pack
58
Erase
59
Overview
59
Erase Lamp Circuit
60
Optics
61
Overview
61
Scanner Drive
62
Scanner Position Sensors
63
Vertical Lens Drive
64
Horizontal Lens Drive
65
Horizontal Lens Positioning
66
For Original Position
66
For Paper Size
66
For Reproduction Ratio
67
Mirror Unit Drive
68
Motor Drive Circuit
69
Exposure Lamp Unit
70
Exposure Lamp Control
71
Auto Image Density Control
72
Uneven Light Intensity Correction
73
Anti-Condensation Heater
74
Optics Cooling Fan
74
Development
75
Overview
75
Drive Mechanism
76
Cross Mixing
77
Development Bias
78
Bias Power Pack
78
Bias Control in Copy Cycle
79
Bias for the ID Sensor Pattern
81
Toner Density Detection and Supply
82
Toner Supply Mechanism
82
Toner Density Detection
83
ID Sensor Pattern Production
83
Toner Density Detection
84
ID Sensor Abnormal Conditions
85
Toner Supply Amount
85
Toner Cartridge
86
Toner End Detection
87
Toner Near End Detection
87
Toner End Detection
88
Image Transfer and Paper Separation
89
Pre-Transfer Discharge
89
Image Transfer
90
Paper Separation
91
Tc/Sc Wire Cleaner
92
Pick-Off Pawls
93
Transport Unit
94
Cleaning
95
Overview
95
Drive Mechanism
96
Cleaning Blade Pressure Mechanism
97
Cleaning Blade Side-To-Side Movement
98
Toner Collection Mechanism
99
Toner Scattering Prevention
100
Cleaning Solenoid Circuit
101
Cleaning Blade Solenoid Control
102
Quenching
103
Paper Feed
104
Overview
104
Paper Feed and Separation
105
Frr Operation
107
Magnetic Torque Limiter
107
Paper Return Mechanism
108
Paper End Detection
109
Paper Volume Detection
110
Paper Tray Drive Mechanism
111
1St & 3Rd Tray
111
2Nd Tray
112
Tray Lock Mechanism
113
1St & 3Rd Tray
113
2Nd Tray
114
Side-To-Side Registration
115
1St Tray
115
2Nd & 3Rd Tray
115
Paper Size Detection
116
1St Tray
116
2Nd Tray
117
3Rd Tray
118
2Nd Tray End Fence
119
Feed Unit Drive Mechanism
120
Transport Unit and Registration
121
Overview
121
Vertical Transport
122
Relay Knob Mechanism
122
Driven Guide Plate Open Mechanism
123
Unit Lock Lever
123
Paper Dust Cleaning Roller
124
Drive Mechanism
125
Fusing
126
Overview
126
Heat Pipe Configuration and Operation Principles
127
Pressure Mechanism
128
Oil Supply
129
Curling and Cooling Mechanism
130
Fusing Drive Mechanism
131
Fusing Lamps Operation
132
Inverter and Paper Exit
134
Overview
134
Ordinary Copying
135
Duplex Copying
135
Overlay Image Copying
136
Face-Down Feed-Out
136
Duplex
137
Overview
137
Duplex Entrance
138
Fork Gate
139
Stacking Mechanism
140
Jogger
141
Paper End Detection
142
Paper Feed and Separation
143
Pick-Up Roller Stop Mechanism
145
Duplex Unit Lock Mechanism
146
Duplex Drive Mechanism
147
Ardf
148
Overview
148
Original Detection
149
Original Size Detection
150
Original Separation
151
Pick-Up Roller
152
Original Feed Drive Mechanism
153
Relay Roller Pressure Release Mechanism
154
Job Separation
155
Original Transport Mechanism
156
Transport Unit Lift Mechanism
158
Transport Belt Unit / Inverter Cover
159
Original Inverter Mechanism
160
Switch Back Mechanism
162
Inverter Drive Mechanism
163
Cff Mechanism
164
Operation Unit
165
Installation
166
Installation Requirement
167
Environment
167
Machine Level
167
Minimum Space Requirements
168
Power Requirements
169
Accessory Check
170
Installation Procedure
171
A3/11" X 17" COUNTER INSTALLATION
180
Key Counter Holder Installation
181
Service Tables
182
Service Remarks
183
Handling the Drum
183
Charge Corona Unit
184
Optics
184
Erase Lamp and Potential Sensor
185
Development Unit
185
Transfer and Separation
186
Cleaning Unit
186
Pre-Transfer and Quenching
186
Paper Feed
186
Fusing Unit
187
Duplex
187
Document Feeder
187
Sorter Stapler
187
Service Program Mode
188
Service Program Mode Operation
188
To Access SP Mode
188
To Exit SP Mode
188
Sp Mode Function
189
Sp Mode Index
210
Dip Sw Table
215
Main Pcb
215
Reset Switch Pcb
215
Preventive Maintenance Schedule
216
Pm Table
216
Regular Pm Schedule
219
Lubrication Points
223
Mirror Unit Guide Rod Felt
223
Lens Horizontal Drive Motor Gears
223
Tray Drive Worm Gears
224
Paper Feed Drive Gears
224
Fusing Drive Gears
225
Df Bushings
225
Replacement and Adjustment
226
Exterior and Inner Covers
227
Left and Right Door Removal
227
Exterior Cover Removal
228
Left and Right Inner Cover
229
Upper Cover Removal
229
Optics
230
Exposure Glass Removal
230
Exposure Lamp Replacement
231
Scanner Flat Cable and Fiber Optics Cable Replacement
235
Scanner Drive Wire Replacement
237
Scanner Drive Motor Removal
246
Lens Vertical Drive Motor Removal
247
Lens Horizontal Drive Motor Removal
248
Mirror Unit Drive Motor Removal
251
6Th Mirror Unit Removal
252
Optics Cooling Fan Filter Replacement
253
Development
254
Development Unit Removal
254
Development Filter Replacement
255
Developer Replacement
256
Side Seal Replacement
258
Development Sleeve Gear Replacement
259
Development Duct Filter Replacement
260
Development Roller Replacement
261
Toner Near End Sensor Bracket Removal
263
Cleaning
264
Cleaning Unit Removal
264
Cleaning Blade Replacement
265
Cleaning Brush Replacement
266
Cleaning Flick Blade Removal
267
Cleaning Flick Roller Removal
268
Around the Drum
271
Drum Replacement
271
Charge Corona Wire and Charge Corona Cleaner Pad
273
Replacement
273
Ptc Wire Replacement
274
Transfer and Separation Corona Wire and Cleaner
275
Replacement
275
Drum Heater Replacement
277
Corona Current Auto Adjustment
278
Charge Corona Adjustment
278
T/S Corona and PTC Current Adjustment
278
First Tray
280
Lct Removal
280
Exterior Cover Removal
281
Front Cover
281
Rear Cover
281
Tray Unit Removal
282
Replacement
283
Pick-Up Solenoid Gap Adjustment
284
Paper End Sensor, Lower Limit Sensor, Paper Size Sensor, and Tray Heater Replacement
285
Preparation
285
Paper End Sensor Replacement
285
Lower Limit Sensor Replacement
286
Paper Size Sensor Replacement
286
Tray Heater Replacement
286
Tray Drive Motor Replacement
287
Tray Drive Wire Replacement
288
Second Tray
291
Exterior Covers Removal
291
Front Cover
291
Left Cover
291
Rear Cover
291
Tray Unit Removal
292
Replacement
293
Pick-Up Solenoid Gap Adjustment
295
Paper End Sensor, Lower Limit Sensor, Paper Size Sensor, and Tray Heater Replacement
296
Tray Motor Replacement
297
Tray Motor Timing Tension Adjustment
298
Tray Drive Chain Pressure Adjustment
298
Third Tray
299
Tray Unit Removal
299
Replacement
300
Pick-Up Solenoid Gap Adjustment
301
Paper End Sensor, Lower Limit Sensor, Paper Size Sensor, and Tray Heater Replacement
302
Preparation
302
Paper End Sensor and Lower Limit Sensor Replacement
302
Paper Size Sensor Replacement
303
Tray Heater Replacement
303
Tray Drive Wire Replacement
304
Registration and Transport
307
Paper Dust Pan Replacement
307
Relay Transport Unit Removal
308
Horizontal Transport Unit Removal
309
Vertical Transport Unit Removal
310
Transport Unit Belts Replacement
311
Pick-Off Pawls Removal
312
Toner Filter Replacement
312
Ozone Filter Replacement
313
Image Fusing
314
Fusing Unit Removal
314
Hot Roller and Pressure Roller Replacement
315
Oil Supply Roller Replacement
317
Replacement
318
Preparation
318
Hot Roller Stripper Replacement
318
Pressure Roller Stripper Pawl Replacement
318
Thermistor and Thermofuse Replacement
319
Fusing Temperature Adjustment
320
Fusing Pressure Adjustment
321
Inverter & Paper Exit
322
Inverter Unit Removal
322
Fusing Sensor and Exit Sensor Replacement
323
Exit Sensor Replacement
323
Fusing Sensor Replacement
323
Pinch Roller Solenoid and Inverter Solenoid
324
Replacement
324
Pinch Roller Solenoid Replacement
324
Inverter Solenoid Replacement
324
Junction Gate Solenoid Replacement
325
Duplex
326
Duplex Unit Removal
326
Separation Roller and Feed Roller Replacement
327
Pick-Up Roller Replacement
328
Positioning Roller Replacement
329
Jogger Unit Removal
333
Transport Belt Replacement
335
Separation Roller Replacement
336
Original Feed Unit Removal
337
Pick-Up Roller Replacement
340
Replacement Procedure
340
Friction Tab Replacement
345
Transport Unit Removal
347
Inverter Roller Replacement
349
Sensor Replacement
351
Skew Correction
355
Motor Speed Adjustment
356
Belt Tension Adjustment
358
Side-To-Side Registration Adjustment
360
Ram Clear Procedure
362
Troubleshooting
363
System Error and Service Call Conditions
364
Blown Fuse Table
388
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