Name: Lexmark C734dn
Brand: Lexmark
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3. Release the hooks (B) securing the pass thru sensor from the top plate assembly.

4. Remove the fourteen screws (C) securing the top plate assembly to the frame.

5. Remove the top plate assembly.

Default Chapter3
- Table of Contents3
Notices and Safety Information9
- Laser Notice9
- Aviso sobre O Laser10
- Lithium Warning15
- Safety Information15
Preface18
- Change History18
- Conventions18
- Navigation Buttons19
General Information21
- Models21
- Options21
  - Media Options22
  - Memory Options22
- Printer Specifications23
- Media Specifications28
- Tools Required for Service35
- Acronyms35
Diagnostic Information37
- Start37
- Operator Panel and Menus38
- Power-On Self Test (POST) Sequence40
- Symptom Tables41
  - Printer Symptom Table41
  - Print Quality Symptom Table41
- User Status and Attendance Messages42
- Error Codes and Messages52
- Service Checks73
XX, 920.01-POST (Power-On Self Test) Aligner Error Service Check86
XX-Cam Motor Error Service Check87
XX-COD (Color on Demand) Motor Service Check89
XX, 161.XX-Motor Error (Option Tray 2) Service Check90
XX, 163.XX-Motor Error (Option Tray 3) Service Check91
XX, 165.XX-Motor Error (Option Tray 4) Service Check92
XX, 167.XX-Motor Error (Option Tray 5) Service Check93
- Next93
XX-Motor (HCIT Elevator) Error Service Check94
250.03-Paper Jam Error Service Check95
201.31-Paper Jam Error Service Check96
- Go Back96
Paper Jam Error Service Check99
230.05-Paper Jam Error Service Check102
Paper Jam Service Check104
242.11-Paper Jam Service Check105
Paper Jam Service Check106
Paper Jam Service Check107
Paper Jam Service Check108
Paper Jam Service Check109
Paper Jam Service Check110
243.11-Paper Jam Service Check111
Paper Jam Service Check112
Paper Jam Service Check113
Paper Jam Service Check114
Paper Jam Service Check115
Paper Jam Service Check116
244.11-Paper Jam Service Check117
Paper Jam Service Check119
Paper Jam Service Check120
Paper Jam Service Check121
245.11-Paper Jam Service Check122
Paper Jam Service Check123
Paper Jam Service Check124
Paper Jam Service Check125
Paper Jam Service Check126
900.99 (Except 900.05)-System Software Error Service Check126
Transfer Module Error Service Check129
Engine Software Error, NVRAM MGR Problem Service Check130
920.25-Transfer Module Missing Error Service Check130
POST (Power-On Self Test) Error Service Check132
POST (Power-On Self Test) Printhead Motor Not Connected Error Service Check134
POST (Power-On Self Test) Error Service Check135
POST (Power-On Self Test)-Four Toner Sensors Not Connected Error Service Check137
POST-Three Toner Sensors Not Connected Error Service Check138
POST (Power-On Self Test)-Two Toner Sensors Not Connected Error Service Check138
POST (Power-On Self Test)-One Sensor Not Connected Error Service Check140
POST (Power-On Self Test) Cartridge Motor 1 Not Connected Error Service Check141
POST (Power-On Self Test)-Cartridge Motor 2 Not Connected Error Service Check142
2-107144
920.15, 920.20-POST (Power-On Self Test)-Bad Transfer Module NVRAM Data Error Service Check144
POST (Power-On Self Test)-Bad Printhead NVRAM Data Error Service Check144
POST (Power-On Self Test)-Output bin Cable Not Connected Error Service Check145
- POST (Power-On Self Test)-Cartridge Motor 3 Not Connected Error Service Check146
- POST (Power-On Self Test)-Transfer Module Stepper Motor Not Connected Error Service Check147
- POST (Power-On Self Test)-24 V Power Supply Failure Error Service Check149
- POST (Power-On Self Test)-Duplex Motor Not Connected Error Service Check150
- 920.28, 920.29-POST (Power on Self Test) Service Check152
- 925.03, 925.05-Fan Error Service Check152
- Next152
- Go Back156
Diagnostic Aids177
- Diagnostics Menu177
- Diagnostics Menu Structure178
- Available Tests178
- Registration181
- Alignment184
- Motor Tests185
- Print Tests186
- Input Source Tests186
- Hardware Tests188
- Duplex Tests190
- Print Test (Duplex)191
- Top Margin (Duplex)192
- Left Margin (Duplex)192
- Sensor Test193
- Printhead Tests194
- Device Tests194
- Printer Setup196
- Page Counts196
- Configuration ID196
- Motor Calibration197
- EP Setup198
- Reports198
- Event Log198
- Ep Defaults198
- Display Log198
- Exit Diagnostics199
- Clear Log199
500 D198
- Configuration Menu (CONFIG MENU)200
- Front Cover Locked in Place208
- Printhead Verification211
- Paper Jams214
  - Error Jam Locations214
  - Clearing Jams215
Repair Information223
- Safety Information223
- Removal and Cleaning Precautions223
- Handling ESD-Sensitive Parts224
- Handing the Photoconductor Unit224
- Screw and Retainer Identification Table225
- Adjustments230
  - Printhead Alignment230
- Printer Removal Procedures240
  - Precautions to Take before Maintenance Work240
- Cover Removals241
- Printer Removals267
- Option Removals413
Connector Locations429
- Locations429
Service Manual430
- Connectors430
- System Board Diagram430
Preventive Maintenance439
- Safety Inspection Guide439
- Lubrication Specifications439
- Maintaining the Printer439
Parts Catalog441
- How to Use this Parts Catalog441
- Assembly 1: Covers442
- Assembly 2: Front444
- Assembly 3: Right446
- Assembly 4: Rear448
- Assembly 5: Left450
- Assembly 6: Top452
- Assembly 7: Cable Parts Packet453
- Assembly 8: Optional 550-Sheet Media Drawer and Tray454
- Assembly 9: Optional Special Media Tray Assembly455
- Assembly 10: Optional High-Capacity Input Option (HCIT)456
- Assembly 11: Options and Features458
Index461
Part Number Index467

Lexmark C734dn Service Manual

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Brand	Lexmark
Model	C734dn
Category	Printer
Language	English