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5 Using a small, ﬂat-blade screwdriver or a sharp pencil, mark the location of the printhead on the printer

frame.

6 Disconnect the printhead cable from the controller board.

7018

Parts removal

303

Main Page

Product Information2
Edition Notice2
Table of Contents3
Notices, Conventions, and Safety Information11
Laser Notice11
Conventions12
Safety Information13
Change History17
General Information21
Printer Model Configurations21
Finding the Serial Number21
Supported Paper Sizes, Types, and Weights21
Supported Paper Sizes22
Supported Paper Types24
Supported Paper Weights25
Tools Required for Service26
Diagnostics and Troubleshooting27
Troubleshooting Precautions27
Troubleshooting Overview29
Performing the Initial Troubleshooting Check29
Power-On Reset (POR) Sequence29
Using Safe Mode30
Fixing Print Quality Issues30
Initial Print Quality Check31
Gray Background or Toner Fog Check32
Blank Pages Check34
Print Is too Dark Check40
Print Is too Light Check42
Paper Curl Check45
Folded or Wrinkled Paper Check46
Solid Black Pages Check47
Repeating Defects Check50
Skewed Print Check51
Streaked Vertical Lines Appear on Prints Check53
Horizontal Light Bands Check54
Vertical Light Bands Check55
Vertical Dark Bands Check56
Vertical Dark Streaks with Print Missing Check58
White Streaks and Voided Areas Check60
Fine Lines Are Not Printed Correctly (Specifically Chinese Characters) Check63
Clipped Pages or Images Check64
Compressed Images Appear on Prints Check66
Incorrect Margins on Prints Check67
Toner Rubs off Check68
Toner Specks Appear on Prints Check69
Paper Jams71
Avoiding Jams71
Identifying Jam Locations72
200 Paper Jams73
202-221 Paper Jams84
230 Paper Jams88
240-241 Paper Jams92
242-244 Paper Jams96
280 Paper Jams101
281 Paper Jams105
284 Paper Jams108
29Y Paper Jams111
4Yy Paper Jams113
User Attendance Messages (0-99.99)124
User Attendance Messages124
Unsupported or Unresponsive Toner Cartridge Service Check125
Unsupported or Unresponsive Imaging Unit Service Check127
Mismatched Supplies Error Service Check128
Maintenance Kit Low Service Check128
Printer Hardware Errors129
111 Errors129
Errors130
126 Errors135
128 Errors138
133 Errors140
140 Errors141
155 Errors142
16Y Errors144
171 Errors149
6Yy Errors150
Procedure before Starting the 9Yy Service Checks153
900 Errors155
95Y Errors160
Adf/Scanner Hardware Errors162
84Y Errors162
Other Symptoms164
Fax Symptoms164
Base Printer Symptoms174
Service Menus179
Understanding the Printer Control Panel179
Using the Control Panel179
Understanding the Status of the Power Button and Indicator Light180
Using the Home Screen180
Diagnostics Menu181
Entering the Diagnostics Menu181
Reports181
Advanced Print Quality Samples181
Format Fax Storage182
Event Log182
Input Tray Quick Print183
Output bin Quick Feed183
Printer Setup183
Printer Diagnostics and Adjustments185
Scanner Diagnostics187
Additional Input Tray Diagnostics189
Output Device Diagnostics189
Configuration Menu190
Entering Invalid Engine Mode193
Entering Recovery Mode193
Service Engineer Menu195
Entering the Service Engineer (SE) Menu195
General SE Menu195
Network SE Menu195
Fax SE Menu196
Scanner SE Menu197
Parts Removal199
Removal Precautions199
Data Security Notice200
Handling ESD-Sensitive Parts201
Critical Information for Controller Board or Control Panel Replacement202
Restoring the Printer Configuration after Replacing the Controller Board203
Restoring Solutions, Licenses, and Configuration Settings206
Updating the Printer Firmware207
Backing up Esf Solutions and Settings208
Disconnecting Ribbon Cables209
Ribbon Cable Connectors210
Zero Insertion Force (ZIF) Connectors210
Horizontal Top Contact Connector211
Horizontal Bottom Contact Connector214
Vertical Mount Contact Connector217
Horizontal Sliding Contact Connector220
Low Insertion Force (LIF) Connector223
Printhead Assembly Adjustment224
Removal Procedures226
Left Side Removals226
Left Cover Removal226
Main Drive Gearbox Removal227
MPF Gearbox Removal229
Fuser Actuator Removal231
Reverse Solenoid Removal233
MPF Solenoid Removal235
Cartridge Gearbox Removal236
Right Side Removals237
Right Cover Removal237
Hard Drive Removal240
Interconnect Cable Removal240
Sensor (Tray Present) Removal242
Cooling Fan Removal243
Controller Board Removal244
Fax Card Removal247
Toner Cartridge Smart Chip Contact Removal247
Cartridge Barrel Shutter Sensor Kit Removal249
Front Removals252
Nameplate Removal252
MPF with Front Access Cover Removal252
Top Access Cover Removal254
Bezel Removal255
Control Panel Display Assembly Removal255
Control Panel Covers and Buttons Removal257
Scanner Front Cover Removal260
Speaker Removal260
Control Panel Flat Cable Removal262
Transfer Roller Removal264
Jam Access Cover Removal264
Sensor (Front Door) Removal265
MPF Pick Roller and Separator Pad Removal267
Sensor (MPF Paper Present) Removal270
Front Input Guide Removal271
Front USB Host Cable Removal271
Bottom Removals273
Power Supply Removal273
Duplex Removal275
Sensors (Duplex and Input) Removal278
Sensor (Index) Removal280
Pick Roller Assembly Removal280
Motor (Pick) Assembly Removal282
Sensor (Toner Density) Removal283
Sensor (Paper Present) Removal285
Sensor (Trailing Edge) Removal287
Paper Present Sensor Flag Removal288
Pick/Lift Motor Gearbox Removal291
Lift Cam Removal292
Sensor (Narrow Media) Removal293
Rear Side Removals294
Scanner Rear Cover Removal294
Rear Door and Cover Removal295
Redrive Assembly Removal295
Fuser Removal296
Redrive Gear Assembly Removal296
Top Removals297
Top Cover Removal297
Sensor (bin Full) Removal301
Printhead Removal302
Adf/Scanner Removals305
ADF Restraint Pad Removal305
ADF Roller Removal306
ADF Separator Roller Removal306
ADF Tray Removal307
Scanner Assembly Removal307
ADF Assembly Removal310
ADF Left Hinge Removal311
ADF Right Hinge Removal312
ADF Access Door Removal313
Flatbed Scanner Assembly Removal314
ADF Flat Cable Removal316
ADF Cable Removal318
Optional 550-Sheet Tray Removals321
Separator Roller Assembly Removal321
Optional Staple Finisher Removals323
Staple Finisher Option Removal323
Stapler Cartridge Access Door Removal326
Staple Roll Holder Removal327
Stapler Right Cover Removal328
Stapler Left Cover Removal329
Stapler Rear Door Removal330
Sensor (Stapler Access Door) Removal331
Stapler Carriage Assembly Removal331
Stapler Door Close Limit Switch Removal333
Motor (Stapler Paddle) Removal337
Stapler Rear Cover Removal337
Sensor (Stapler Rear Cover) Removal338
Trapped Staple Access Door Removal340
Stapler Service Cover Removal341
Stapler Controller Board Removal341
Motor (Stapler Left Tamper) Removal341
Motor (Stapler Right Tamper) Removal342
Stapler Rear Cover Close Limit Switch Removal343
Stapler Cooling Fan Removal345
Stapler Power Supply Unit Removal345
Stapler Interface Cable Removal347
Stapler Top Cover Removal349
Sensor (Stapler bin Full Receive) Removal352
Sensor (Stapler bin Full Send) Removal354
Sensor (Stapler Pass Through) Removal357
Tamper Main Assembly Removal359
Tamper Sub-Assembly Removal360
Tamper Drive Belt Removal362
Diverter Gearbox Removal363
Stapler Accumulator Assembly Removal366
Sensor (Stapler Right Tamper HP) Removal366
Sensor (Stapler Left Tamper HP) Removal367
Sensor (Stapler Paddle HP) Removal368
Component Locations371
Printer Configurations371
Printer Roller Locations372
Printer Sensor Locations374
Controller Board Connectors375
Maintenance381
Inspection Guide381
Scheduled Maintenance381
Maintenance Kits381
Resetting the Maintenance Counter382
Lubrication Specification382
Cleaning the Printer383
Cleaning the Scanner384
Cleaning the Printhead Lenses386
Parts Catalog388
Legend388
Assembly 1: Covers389
Assembly 2: Control Panel391
Assembly 3: Electronics 1393
Assembly 4: Electronics 2395
Assembly 5: Electronics 3397
Assembly 6: Electronics 4399
Assembly 7: Paper Transport 1401
Assembly 8: Paper Transport 2403
Assembly 9: MPF and Standard Tray405
Assembly 10: Optional Trays407
Assembly 11: Imaging409
Assembly 12: Fax Card and Hard Disk411
Assembly 13: Staple Finisher Option413
Assembly 14: Staple Finisher (Right)415
Assembly 15: Staple Finisher (Top)417
Assembly 16: Staple Finisher (Rear)419
Assembly 17: Staple Finisher Exit Assembly421
Assembly 18: Staple Finisher Tamper Assembly423
Assembly 19: Staple Finisher Accumulator Assembly425
Assembly 20: Maintenance Kits427
Assembly 21: Miscellaneous429
Printer Specifications431
Power Consumption431
Product Power Consumption431
Sleep Mode431
Hibernate Mode431
Off Mode432
Total Energy Usage432
Selecting a Location for the Printer432
Noise Emission Levels433
Temperature Information434
Options and Features435
Available Internal Options435
Input/Output Configurations and Capacities435
Theory of Operation437
POR Sequence437
Printer Control437
Print Cycle Operation438
Print Engine Layout438
Print Cycle439
Printer Operation445
Printer Sections445
Printer Paper Path446
Printer Paper Path Sensors448
Main Drive449
Tray Drive450
ADF and Scanner Operation451
Flatbed Scanner Drive451
ADF Paper Path452
ADF Paper Path Sensors453
Acronyms455
Index457
Part Number Index463
Part Name Index469

Lexmark MB2650 - Page 303

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