Lexmark T420n Monochrome Laser Printer Manuals

Manuals and User Guides for Lexmark T420n Monochrome Laser Printer. We have 1 Lexmark T420n Monochrome Laser Printer manual available for free PDF download: Service Manual

Lexmark T420n Service Manual

Lexmark T420n Service Manual (208 pages)

Service Manual

Brand: Lexmark | Category: Printer | Size: 5 MB

Table of Contents

Table of Contents
3
Laser Notices

7
- Laser Advisory Label
  7
- Laser Notice
  8
Safety Information

17
Preface

22
- Preventive Maintenance
  22
- Parts Catalog
  22
General Information

23
- Maintenance Approach
  23
- Special Tools
  23
- Serial Number
  24
- Printer Identification
  24
- Printer Features
  25
  - Memory and User Flash Memory
    25
  - Resolution and Print Quality
    26
  - Print Area
    27
  - Print Media
    28
  - Printer Data Streams
    29
  - Fonts
    30
  - Paper Handling
    30
  - Connectivity
    32
  - Printer Speed
    33
  - RIP Card Specifications
    33
  - Supplies
    34
  - Operator Panel
    34
- Options
  35
- Acronyms
  36
Diagnostic Information

37
- Start
  37
  - Operator Panel
    38
  - Light Patterns
    39
  - Status Information Light Patterns
    39
  - Attendance Information Light Patterns
    41
  - Service Information Light Patterns
    45
  - Obtaining Information about Printer Service Error Codes
    47
  - Service Error Codes
    47
  - Fuser Error
    50
  - Toner Sensor Error
    51
  - Printhead Error
    52
  - Nvram Failure
    56
  - Network Error
    59
  - Power-On Operations
    61
  - Power-On Self Test (POST)
    62
  - Symptom Tables
    62
  - Post Symptom Table
    62
  - Printer Symptom Table
    63
4048-00X

65
- Service Checks
  65
  - Cooling Fan Service Check
    65
  - Rip Card
    65
  - Cover Interlock Switch Service Check
    66
  - RIP Card Service Check
    67
  - Dead Machine Service Check
    69
  - Low Voltage Power Supply (LVPS) Service Check
    69
  - Fuser Service Check
    70
  - Cold Fuser Service Check
    71
  - Main Motor Service Check
    73
  - Operator Panel Service Check
    74
  - Transfer Roll Service Check
    76
  - Paper Feed Service Checks
    77
  - Print Quality Service Checks
    84
- Solving Print Quality Problems
  91
- Restoring Factory Defaults
  98
- Using Print Quality Test Pages
  98
Diagnostic Aids

99
- Operator Panel
  99
  - Menu Definition
    99
- Configuration Menu Group or Diagnostic Menu Group
  100
  - Printer Diagnostics Mode
    104
- Continuity Check on Hvps/Cartridge
  106
Repair Information

107
- Handling ESD-Sensitive Parts
  107
- Adjustments
  108
  - Printhead Assembly Adjustment
    108
  - Adjusting Paper Feed Alignment
    109
  - Lubrication
    109
  - Re-Assembly
    111
- Removal Procedures
  112
  - Cover Removals
    112
  - Rear Exit Door Removal
    124
  - Duplex Tray Assembly Removal
    125
  - Fuser Assembly, Fuser Paper Exit Guide, Fuser Exit Sensor, and Fuser Lamp Removal
    126
  - Terminal Assembly Removal
    128
  - Tray Damper and Spring Removal
    129
  - Door Latches Removal
    130
  - Bracket, Opener Shutter Removal
    131
  - Paper Guide Roller Removal
    132
  - Charge Roll Removal
    133
4048-00X

134
- Right Guide Removal
  134
- Left Guide Removal
  134
- Smart Button Sensor Removal
  137
- Entrance Guide Removal
  138
- Transfer Roll Assembly and Left Transfer Support Bearing Removal
  139
- Bracket, Paper Detect (Input Sensor) Removal
  140
- D-Roll Tray 1 Feed Removal
  141
- D-Roll (Tray 1) Shaft Assembly Removal
  142
- 3-Pin and 2-Pin Connectors Removal
  144
- Printhead Removal
  145
- RIP Card Cage (with Card in Place) Removal
  146
- Remove the Inner Cover
  146
- Main Drive Motor Assembly Removal
  148
- Motor Assembly (Stepper) Removal
  149
- Main Drive Assembly Removal
  150
- Reference Plate Assembly Removal
  152
- Remove the Gear Train Assembly. See "Main Drive Assembly Removal" on Page 4-44 for more Information
  152
- Cartridge Coupling Assembly Removal
  154
- Remove the Top Cover. See
  154
- Remove the Left Side Cover. See
  154
- Remove the RIP Card Cage. See
  154
- Place) Removal
  154
- Top Cover Assembly Removal
  154
- For more Information
  154
- RIP Card Cage
  154
- Upper (MPF) Housing Assembly (with Paper Flag) Removal
  155
- Lower (MPF) Housing Assembly - Paper Sensor Removal
  156
- Lower (MPF) Housing Assembly Removal
  158
- MPF Roller Assembly Removal
  159
- HVPS Card Removal
  162
- LVPS Card Removal
  163
- Cooling Fan Removal
  164
Locations

165
- Cables
  166
- Cables (Continued)
  168
- Sensors
  170
- RIP Card Assembly
  172
- Power Supply (LVPS)
  175
- High Voltage Power Supply (HVPS)
  176
Preventive Maintenance

177
- Safety Inspection Guide
  177
- Lubrication Specifications
  177
Parts Catalog

179
- How to Use this Parts Catalog
  179
- Index
  183

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