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BIZHUB 420
Konica Minolta BIZHUB 420 Service Manual
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SERVICE MANUAL
2006.02
Ver. 1.0
Theory of Operation
500
/
420
2
Table of Contents
Theory of Operation Total Contents
2
Table of Contents
2
Description Items for Danger, Warning and Caution
4
Safety and Important Warning Items
4
Important Notice
4
Safety Warnings
5
Safety Information
15
Important Notice
15
Indication of Warning on the Machine
16
Measures to Take in Case of an Accident
18
Composition of the Service Manual
20
Notation of the Service Manual
21
Outline
26
System Configuration
30
Product Specifications
32
Unit Configuration
36
Paper Path
37
Composition/Operation
38
Overall Configuration
38
Time Chart When the Power Is Turned on
38
Control Block Diagram
39
Composition
40
Drive
40
Scanner Section
40
Operation
41
Scan/Exposure Lamp Control
41
Original Size Detection Control
44
AE Control
45
Image Processing
46
Composition
47
Write Section
47
Image Stabilization Control
48
Laser Beam Path
48
Operation
48
Write Control
48
Image Processing
49
Composition
50
Photo Conductor Section
50
Drive
51
Drum Claw Drive
51
Drum Drive
51
Image Creation Control
52
Operation
52
Drum Claw Control
53
Image Stabilization Control
53
Charging Control
54
Charging Section
54
Composition
54
Erase Lamp (EL) Control
54
Operation
54
Composition
55
Transfer/Separation Section
55
Operation
56
Transfer Exposure Lamp (TSL) Control
56
Transfer Guide Control
56
Transfer/Separation Control
56
Composition
57
Developing Unit
57
Drive
58
Developer Conveyance
59
Operation
59
Developing Bias
60
Developing Suction Control
61
Image Stabilization Control
61
Composition
62
Toner Supply Section
62
Drive
63
Operation
64
Toner Level Detection Control
64
Toner Supply Control to the Developing Unit
64
Toner Supply Control to the Toner Hopper
64
Toner Conveyance Control
65
Cleaning/Toner Recycle Section
66
Composition
66
Drive
67
Cleaning Operation
68
Operation
68
Toner Collection Mechanism
68
Toner Conveyance Operation
68
Composition
69
PAPER FEED SECTION (Tray 1/2)
69
Tray 1
69
Tray 2
69
Drive
70
Paper Feed Drive
70
Tray Lift Drive
70
Operation
71
Up/Down Control
71
Paper Size Detection Control
72
Paper Feed Control
74
Paper Empty Control
77
Paper Remaining Detection Mechanism
78
Bypass Section
79
Composition
79
Drive
80
Paper Feed Drive
80
Tray Lift Drive
80
Operation
81
Up/Down Control
81
Paper Size Detection Control
82
Paper Feed Control
83
Paper Empty Control
84
Composition
85
Registration Section
85
Drive
86
Theory of Operation Ver1.0 Feb.2006 CONTENTS
86
Loop Control
87
Operation
87
Adu Section
89
Composition
89
Drive
90
Conveyance Path
91
Operation
91
Conveyance Control
92
Composition
100
Drive
100
Fusing Section
100
Fusing Roller Drive Control
101
Operation
101
Web Drive Control
101
Fusing Temperature Control
102
Fusing Roller Edge Cooling Control
103
Envelope Conveyance Mechanism
104
Jam Detection Control
105
Protection against Abnormality
105
Composition
106
Drive
106
Reverse/Exit Section
106
Conveyance Control
107
Operation
107
Reverse Control
109
Composition
111
Interface Section
111
Specifications
111
Image Stabilization Control
112
Image Stabilization Control Flow When the Power Switch (SW2) Is Turned on
112
Operation Flow
112
Outline
112
Image Stabilization Control Flow While in the Print and the Idle
115
Image Processing
117
Image Processing in the Scanner Section
117
Shading Correction
118
AE Control
119
Area Discrimination
120
Brightness/Density Conversion
120
Filter/Magnification
121
Compression
123
Halftone Processing (Error Diffusion)
123
Scanner Gamma Correction
123
Storage of Image Data
123
Image Processing in the Write Section
124
Composition
125
Fan Control
125
Others
125
Operation
126
Composition
129
Counter Control
129
Operation
130
Parts that Operate When the Main Power Switch (SW1) Is Turned on
132
Parts that Operate When the Power Switch Is Turned on
132
Parts that Operate When the Power Switch (SW2) Is Turned on
133
Outline/Composition/Operation
136
Outline
138
Product Specifications
139
In 1-Sided Mode
141
In 2-Sided Mode
141
Paper Path
141
Composition
142
Composition/Operation
142
Drive
143
Document Pick-Up Mechanism
144
Operation
144
Pick-Up Operation
144
Document Feed/Conveyance Mechanism
145
DF 15° Open/Close Detection Mechanism
149
DF Open/Close Detection Mechanism
149
Raised/Lowered Position Detecting Mechanism
149
Outline/Composition/Operation
152
Outline
154
Product Specifications
154
Paper Path
155
Composition
156
Composition/Operation
156
Drive
157
Operations
158
Paper Feed Mechanism
158
Paper Feed Section
158
Paper Lifting Motion
159
Paper Size Detection
160
Tray Section
160
Paper Level Indicator Mechanism
161
Outline/Composition/Operation
164
Outline
166
Product Specification
166
Paper Path
167
Composition
168
Composition/Operation
168
Drive
169
Operations
170
Paper Feed Mechanism
170
Paper Feed Section
170
Tray Section
171
Up/Down Mechanism
171
Shift Gate Drive Mechanism
172
Shifter Drive Mechanism
173
Paper Empty Detection
174
Table of Contents
178
Outline
180
Product Specification
180
Paper Path
181
Composition
182
Composition/Operation
182
Drive
183
Paper Feed Drive
183
Paper Feed Section
183
Operation
184
Paper Feed Control
184
Remaining Paper Detection Control
186
Drive
187
Tray Lift Drive
187
Tray Section
187
Operation
188
Tray Lift Control
188
Outline/Composition/Operation
192
Outline
194
Product Specifications
194
Exiting Paper to the Tray /1
198
Paper Path
198
Exiting Paper to the Tray /2
199
Exiting Paper to OT
200
Composition
202
Composition/Operation
202
Drive
203
Conveyance Section
205
Operations
205
Entrance/Conveyance Section
206
Intermediate Conveyance Section
207
Exit Conveyance Section
208
Up/Down Mechanism
209
Up/Down Section
209
Tray Up/Down Operation
210
Tray Upper Limit Position Detection Mechanism
211
Shutter Open/Close Mechanism
214
Paper Aligning Mechanism (Sub Scan Direction)
215
Stacker Section
215
Paper Aligning Mechanism (Main Scan Direction)
216
Exit Mechanism
218
Stapling
220
Stapling Mechanism
220
Stapling Position
221
Stapling Unit Moving Mechanism
221
Staple Empty Detection
222
Composition
223
Operation
223
Registration Mechanism
223
Punch Mechanism
224
Punch Status Detection
224
Punch Scraps Box Full Detection Mechanism
225
Composition
226
Operation
226
Overview
226
Table of Contents
230
Outline
232
Product Specification
232
Paper Path
236
Composition
238
Composition/Operation
238
Drive
239
Conveyance Mechanism
241
Operation
241
RU Conveyance Section
241
Entrance Conveyance Mechanism
242
FS Conveyance Section
242
Gate Mechanism
244
Sub Tray Conveyance Mechanism
246
Main Tray/Handling Tray Conveyance Mechanism
247
Roller Separation Mechanism
250
Conveyance Operation
253
Main Tray Section
255
Main Tray Up/Down Mechanism
255
Main Tray Shift Mechanism
256
Punch Mechanism
257
Punch Section
257
Punch Hole Switchover Mechanism (for Inch Area)
258
Alignment Mechanism
259
Staple Section
259
Stapler Movement Mechanism
261
Outline/Composition/Operation
266
Outline
268
Product Specifications
268
Paper Path
269
Composition
270
Composition/Operation
270
Drive
271
Half-Fold Section
271
Saddle Stitching Section
271
Operations
272
Paper Conveyance Mechanism
272
Conveyance Roller Pressure/Release
273
Pressure/Release Mechanism
273
Operation
274
Stapling Mechanism
275
Operation Timing
276
Staple Guide
276
Staple Guide Mechanism
276
Half-Folding Mechanism
277
Operation
278
Paper Guide
279
Paper Guide Mechanism
279
Tray Paper Detection
280
Outline/Composition/Operation
284
Outline
286
Product Specifications
286
Paper Path
287
Composition
288
Composition/Operation
288
Drive
289
Operations
290
Paper Conveyance Mechanism
290
Paper Path Selection Mechanism
291
Paper Detection
292
Outline/Composition/Operation
296
Outline
298
Product Specifications
298
Paper Path
299
Composition
300
Composition/Operation
300
Job Tray Conveyance/Exit
301
Operations
301
Field Service Total Contents
304
Description Items for Danger, Warning and Caution
306
Important Notice
306
Safety and Important Warning Items
306
Safety Warnings
307
Important Notice
317
Safety Information
317
Indication of Warning on the Machine
318
Measures to Take in Case of an Accident
320
Composition of the Service Manual
322
Notation of the Service Manual
323
Table of Contents
328
Adjustment/Setting
330
Outline
334
System Configuration
334
Product Specifications
336
Main Body (Bizhub 500) / DF / PC / LU / FS / MT / SD / RU
340
Periodic Check
340
Schedule
340
Main Body
341
Main Body (Bizhub 420) / DF / PC / LU / FS / MT / SD / RU
341
Periodically Replacement Parts List
349
Replacement Parts List
349
Life Value
351
Life Value of Materials
351
Maintenance Procedure of the External Section
352
Replacing the Ozone Filter
352
Replacing the Filter Cover Assy and the Suction Filter /A Assy
353
Replacing the Paper Exit Suction Filter
355
Maintenance Procedure of the Write Section
356
Replacing the Write Unit
356
Maintenance Procedure of the Photosensitive Material Section
360
Replacing the Drum Unit
360
Replacing the Drum
361
Maintenance Procedure of the Transfer/Separation Corona Section
367
Replacing the Transfer/Separation Corona Unit
367
Maintenance Procedure of the Developing Section
368
Replacing the Developing Unit
368
Replacing Developer
369
Maintenance Procedure of the Toner Supply Section
372
Replacing the Filter Mounting Plate Assy
372
Replacing the Suction Cover /2 Assy
373
Cleaning/Toner Recycle Section
375
Replacing the Cleaning Blade Assy
375
Maintenance Procedure of the Paper Feed Section
377
Replacing the Feed Roller/Pick-Up Roller (Tray 1)
377
Replacing the Separation Roller Assy (Tray 1)
382
Replacing the Feed Roller/Pick-Up Roller (Tray 2)
384
Replacing the Separation Roller Assy (Tray 2)
391
Maintenance Procedure of the Bypass Tray Section
393
Replacing the Separation Roller Assy
396
Replacing the Feed Roller
399
Cleaning the Paper Dust Removing Brush
402
Maintenance Procedure of the Registration Section
402
Replacing the Loop Roller, the Loop Bearing, the Registration Roller /Rt
402
Maintenance Procedure of the Fusing Section
409
Removing/Reinstalling the Fusing Unit
409
Replacing the Fusing Claw Assy
411
Replacing the Fusing Web
413
Replacing the Fusing Driven Roller Assy /A and /B
415
Removing/Reinstalling the Fusing Heater Lamps /1 (L2) and /2 (L3)
417
Replacing the Fusing Roller, the Fusing Pressure Roller, the Heat Insulating Sleeve /A, the Fusing Bearings /Up and /Lw and the Fusing Input Gear Assy
419
Replacing the Fusing Sensor Assy
422
Replacing the Fuse Holder Assy
424
Service Material List
425
Service Tools
425
Jig List
426
Materials
427
Firmware Data Flow
428
Firmware Version up
428
Isw
428
Outline
428
Settings on the Main Body Side While in ISW
429
Iswtrns
430
Specifications
430
Installation of the Iswtrns
431
Usage of the Iswtrns
433
Error List
442
Items Not Allowed to be Disassembled and Adjusted
446
Others
446
Scanner Section
446
Write Section
448
Developing Unit
450
Drum Unit
451
List of Parts to be Disassembled and Reassembled
452
Disassembling/Assembling Procedure
453
Removing/Reinstalling the Rear Cover /1
453
Removing/Reinstalling the Rear Cover /2
453
Removing/Reinstalling the Rear Cover /3
454
Removing/Reinstalling the Right Cover /Up
455
Removing/Reinstalling the Left Cover
456
Removing/Reinstalling the Right Cover /Lw
456
Removing/Reinstalling the Front Door
457
Removing/Reinstalling the Original Glass
458
Removing/Reinstalling the Upper Covers /Fr and /Lt
460
Adjustment/Setting
734
Product Specifications
737
Maintenance Procedure
740
Periodic Check
740
Replacing the Pick-Up Roller and Feed Roller
740
Replacing the Separation Roller
741
Cleaning of the Pick-Up Roller, Feed Roller and Separation Roller
742
Cleaning of Miscellaneous Rolls
743
Cleaning of Miscellaneous Rollers
744
Cleaning of the Scanning Guide
746
Cleaning of the Reflective Sensor Section
747
Disassembly/Adjustment Prohibited Items
748
Other
748
Cover /Fr, Cover /Rr and Original Feed Tray Cover /Lw
749
Disassembling and Assembling List
749
Disassembling and Assembling Procedure
749
DF Control Board (DFCB)
750
Original Size VR (VR1)
750
Complete Stamp Unit 2
752
Replacing the Replace Stamp 2
753
Adjustment/Setting
754
Leading Edge Skew Adjustment
754
Mechanical Adjustment
754
Adjustment/Setting
758
Product Specifications
760
Maintenance Procedure
762
Periodic Check
762
Replacing the Separation Roller Assy
762
Replacing the Feed Roller
763
Replacing the Pick-Up Roller
766
Disassembly/Adjustment Prohibited Items
768
Other
768
Disassembling and Assembling List
769
Disassembling, Assembling and Cleaning List
769
Disassembling and Assembling Procedure
770
Rear Cover
770
Right Door/Rear Right Cover/Lower Right Cover/Front Right Cover
770
Cleaning Procedure
771
Separation Roller
771
Feed Roller
772
Pick-Up Roller
772
Vertical Conveyance Roller
772
Adjustment/Setting
774
Mechanical Adjustment
774
Mis-Centering Adjustment of the Trays 3 and 4
774
Adjustment/Setting
778
Product Specification
780
Maintenance Procedure
782
Periodic Check
782
Replacing the Separation Roller Assy
782
Replacing the Feed Roller
783
Replacing the Pick-Up Roller
786
Disassembly/Adjustment Prohibited Items
788
Other
788
Cleaning List
789
Disassembling and Assembling List
789
Disassembling, Assembling and Cleaning List
789
Disassembling and Assembling Procedure
790
Rear Cover
790
Right Door/Rear Right Cover/Lower Right Cover/Front Right Cover
790
Tray
791
Wire
792
Cleaning Procedure
795
Feed Roller
795
Separation Roller
795
Pick-Up Roller
796
Vertical Conveyance Roller
796
Adjustment/Setting
798
Mechanical Adjustment
798
Mis-Centering Adjustment
798
Shifter Movement Timing Belt Adjustment
800
Table of Contents
804
Product Specification
806
Maintenance Procedure of the Paper Feed Section
808
Periodic Check
808
Replacing the Pick-Up Rubber and the Feed Rubber
808
Replacing the Separation Roller
812
Disassembling and Assembling Procedure
816
Removal and Reinstallation of the Right Cover, the Front Cover and the Rear Cover
816
Replacing the Wires
819
Adjusting the Tilt of the Lift Plate
826
Adjustment/Setting
826
Mechanical Adjustment
826
Adjustment/Setting
830
Product Specifications
834
Cleaning of the Roller and Roll
836
Maintenance Procedure
836
Periodic Check
836
Disassembly/Adjustment Prohibited Items
838
Other
838
Conveyance Front Cover /Up, /Rt, /Lw
840
Conveyance Upper Cover
840
Disassembling and Assembling Procedure
840
Conveyance Front Cover /Lt
841
Front Door
841
Paper Exit Front Cover, Rear Cover, Connector Cover
842
Tray /1
843
Tray /2
843
Conveyance Unit
844
Lift Tray
844
Stapler
845
Stacker Paddle Drive Clutch Assy
847
Paper Holding Paddle Drive Clutch Assy
848
Adjustment/Setting
852
Mechanical Adjustment
852
Staple Position Adjustment
852
Adjustment of the Installation Position of the Shutter Drive Gear
853
Punch Mis-Centering Adjustment (PU-501)
854
Table of Contents
858
Product Specification
860
Disassembling and Assembling List
864
Others
864
Disassembling and Assembling Procedure
865
Removal/Reinstallation of the Upper Cover
865
Removal/Reinstallation of the Front Cover /Up
867
Removal/Reinstallation of the Front Cover /Lw
868
Removal/Reinstallation of the Rear Cover
869
Removal/Reinstallation of the Punch Unit
870
Replacing the Stapler Unit
872
Adjustment/Setting
876
Mechanical Adjustment
876
Output Check Mode
876
Switches Provided Inside the Board
876
Output Check Mode
877
Adjusting the Punch Hole Position in the Vertical Direction
883
Adjusting the Solenoid
885
Adjustment of the Bypass Gate Solenoid (SD1)
885
Adjustment of the Main Gate Solenoid (SD2)
886
Adjusting the Belt Tension
887
Adjustment of the Timing Belt of the Conveyance Motor /Up (M4)
887
Adjustment of the Timing Belt of the Conveyance Motor /Lw (M2)
888
Adjustment of the Timing Belt of the Paper Exit Motor (M3)
889
Adjusting the Tray Upper Surface Detection Position
890
Adjusting the Tray Overload Detection Level
892
Adjustment/Setting
898
Product Specifications
900
Cleaning of the Rollers and Rolls
902
Maintenance Procedure
902
Periodic Check
902
Disassembly/Adjustment Prohibited Items
903
Other
903
Disassembling and Assembling List
904
Disassembling and Assembling Procedure
904
Paper Output Tray/Front Cover
904
Rear Cover
905
Upper Cover
905
Saddle Unit
906
Folding Unit
908
Stapler Unit
908
Paper Guide Motor (M13)
913
Folding Roller
915
Adjustment/Setting
922
Fold Skew Adjustment
922
Mechanical Adjustment
922
Center Staple Skew Adjustment
923
Product Specifications
928
Cleaning of the Roller and Roll
930
Maintenance Procedure
930
Periodic Check
930
Disassembly/Adjustment Prohibited Items
931
Other
931
Disassembling and Assembling List
932
Disassembling and Assembling Procedure
932
Rear Cover/Right Door
932
Front Cover/Upper Cover/Paper Output Tray
941
Product Specifications
946
Firmware Version up
948
Disassembly / Reassembly
949
Tools Required
949
Removal / Installation of Printer Key Control Board
950
Adjustment / Setting
952
Service Mode
952
Starting and Finishing the Service Mode
952
Troubleshooting
954
Troubleshooting of the Print Controller and Copier
954
Troubleshooting the Printing System
954
Data Capture
955
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User Guide
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Setting-Up Guide
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Product Guide
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Specification & Installation Guide
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Shortcut Manual
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5
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Konica Minolta BIZHUB 420 Specifications
General
Brand
Konica Minolta
Model
BIZHUB 420
Category
All in One Printer
Language
English
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