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NCU

B404 3-2 SM

3.3 NCU

[A]: Fax unit (! 2, " 2)

[B]: Bracket (! 2)

[C]: NCU cover (! 6) (European and Asian models only)

[D]: NCU (! 4, " 1)

B404R500.WMF

B405I108.WMF

B404R503.WMF

[A]

[C]

[B]

[D]

[B]

[D]

Table of Contents

Default Chapter1
- Service Manual1
- Table of Contents11
- Important Safety Notices27
- B120 (Rla Only)29
Installation31
- Installation Requirements33
- Copier Installation36
- Platen Cover Installation40
  - Accessory Check40
- Ardf Installation41
  - Accessory Check41
  - Installation Procedure41
- Adf Installation43
  - Accessory Check43
  - Installation Procedure43
- Two-Tray Paper Tray Unit Installation45
  - Accessory Check48
- One-Tray Paper Tray Unit Installation48
- Imb Installation51
  - Accessory Check51
  - Installation Procedure51
- Dram Installation52
- Anti-Condensation Heater Installation53
- Tray Heaters54
- Key Counter Installation59
Preventive Maintenance61
- Pm Tables63
- Preventive Maintenance Schedules63
- How to Clear the Pm Counter65
Replacement and Adjustment67
- General Cautions69
- Special Tools and Lubricants70
- Exterior Covers & Operation Panel71
- Scanner Section78
- Laser Unit86
- Location of "Caution" Decal86
- Pcu Section90
- Toner Supply Motor95
- Paper Feed Section96
- Image Transfer104
  - Image Transfer Roller104
  - Image Density Sensor104
- Fusing105
- Duplex Unit (Duplex Models Only)110
- Other Replacements112
- Copy Adjustments: Printing/Scanning118
Troubleshooting125
- Service Call Conditions127
  - Sc Code Descriptions128
- Electrical Component Defects134
  - Sensors134
  - Switches135
- Blown Fuse Conditions136
- Led Display136
  - Bicu136
  - Iob136
- Firmware Modification History137
Service Tables140
- Using Service Program Modes142
- User Tools190
  - How to Enter and Exit User Tools190
  - User Tools Table190
    - System Setting Table190
    - Copy Features Table191
Detailed Section Descriptions192
- Overview194
- Board Structure198
  - Block Diagram198
- Copy Process Overview200
- Development201
  - Scanner Drive203
  - Original Size Detection in Platen Mode204
- Image Processing206
- Laser Exposure223
  - Auto Power Control (Apc)224
  - Ld Safety Switch225
- Photoconductor Unit (Pcu)226
  - Drive227
- Drum Charge228
- Drum Cleaning and Toner Recycling243
  - Drum Cleaning243
  - Toner Recycling243
- Paper Feed244
- Image Transfer and Paper Separation250
- Image Fusing and Paper Exit253
- Duplex Unit260
- Energy Saver Modes265
Auto Reverse Document Feeder B379270
Overall Machine Information272
- Mechanical Component Layout272
- Electrical Component Layout273
- Drive Layout274
Detailed Section Descriptions275
- Original Size Detection275
- Pick-Up and Separation277
- Original Transport and Exit278
- Stamp281
- Timing Charts282
- Jam Detection286
- Overall Electrical Circuit287
- Free Run288
Replacement and Adjustment289
- Df Exit Table and Cover289
- Original Feed Unit290
- Left Cover291
- Pick-Up Roller292
- Feed Belt293
- Separation Roller294
- Original Set/Original Reverse Sensors295
- Original L/W Sensor, Trailing Edge Sensor296
- Feed Clutch, Pick-Up Sol, Transport Motor, Feed Motor297
- Registration Sensor298
- Stamp Solenoid and Original Exit Sensor299
Document Feeder B387300
Overall Information302
- Mechanical Component Layout302
- Electrical Component Layout303
- Drive Layout304
Detailed Section Descriptions305
- Original Size Detection305
- Pick-Up and Separation307
- Original Transport and Exit Mechanism308
- Stamp309
- Timing Charts310
  - A3, Stamp Mode311
- Jam Detection312
- Overall Electrical Circuit313
- Free Run314
  - Procedure314
  - Free Run Process314
Replacement and Adjustment315
- Exterior Covers315
- Feed Unit316
- Separation Roller316
- Pick-Up Roller317
- Feed Belt317
- Original Sensors (Width, Length, Trailing Edge)318
- Original Set Sensor319
- Transport Motor319
- Df Cover Open Sensor/Feed Clutch/Rom/Df Drive Board320
- Registration Sensor321
- Pick-Up Solenoid321
- Stamp Solenoid322
Paper Tray Unit B384324
Overall Machine Information326
- Mechanical Component Layout326
- Electrical Component Layout327
- Drive Layout328
Detailed Descriptions329
- Paper Feed and Separation Mechanism329
- Paper Lift Mechanism330
- Paper End Detection332
- Paper Height Detection333
  - Paper Size Detection334
- Side and End Fences335
  - Side Fences335
  - End Fence335
Replacement and Adjustment336
- Feed Roller Replacement336
- Tray Main Board Replacement337
- Tray Motor Replacement337
- Relay Clutch Replacement338
- Upper Paper Feed Clutch Replacement339
- Lower Paper Feed Clutch Replacement340
- Lift Motor Replacement341
- Paper End Sensor Replacement342
- Vertical Transport Sensor Replacement342
- Paper Size Switch Replacement343
Paper Tray Unit B385344
Overall Machine Information346
- Mechanical Component Layout346
- Electrical Component Layout347
- Drive Layout348
Detailed Descriptions349
- Paper Feed and Separation349
- Paper Lift Mechanism350
- Paper End Detection352
- Paper Height Detection353
- Paper Size Detection354
- Side and End Fences355
  - Side Fences355
  - End Fence355
Replacement and Adjustment356
- Feed Roller Replacement356
- Tray Main Board Replacement357
- Tray Motor Replacement358
- Lift Motor Replacement359
- Paper End Sensor Replacement360
- Paper Size Switch Replacement360
Specifications362
- General Specifications364
  - Duplex Unit (B043 Only)367
- Machine Configuration368
- Optional Equipment369
Service Tables375
- Fax Unit386
- Removal and Replacement399
- Error Codes405
- Fax Sc Codes413
- Fax Sc Code Table414
- Function no418
- How to Enter and Exit Service Mode418
- Service Level Functions418
- Data Transfer425
- Fax Software Download425
- Fax Sram Download426
- Fax Sram Upload427
- Bit Switches428
- System Switches428
- Scanner Switches439
- Plotter Switches444
- Communication Switches449
- G3 Switches454
- Ncu Parameters462
- Dedicated Transmission Parameters473
- Programming Procedure473
- Service Ram Addresses477
- Operation Dump List492
- Ncu (Us)495
- Ncu (Europe/Asia)496
  - Features List501
  - Capabilities of Programmable Items504
  - Overall Machine Control505
  - Video Data Path506

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