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4.10 Troubleshooting for PCB Problems

4.10.1Main PCB failure

• Turn the power switch OFF and then back ON again.

• Install the latest main firmware.

• Check the print limit ID.

• Check that the print data is not damaged.

4.10.2Full memory

• Print the accumulated data.

• Reduce the amount or resolution of the data.

Step Cause Remedy

1 Main PCB failure Replace the main PCB ASSY.

Step Cause Remedy

1 Main PCB failure Replace the main PCB ASSY.

Default Chapter1
- Service Manual1
- Copyright and License3
- Open Source Licensing Remarks3
- Table of Contents4
Safety Information9
- Additional Information13
Chapter 1 Supplemental Specifications14
General14
Network Connectivity19
Service Information19
Supplies20
Chapter 2 Error Indications and Troubleshooting23
Introduction23
- Precautions23
- Checks before Commencing Troubleshooting25
Overview27
- Cross-Section Drawing27
- Paper Feeding29
- Operation of each Part and Location of Parts31
- Block Diagram33
- Main Components34
Error Indications35
- Error Codes36
- Error Message43
Troubleshooting55
- Error Cause and Remedy55
- Troubleshooting for Paper Feeding Problems75
- Troubleshooting for Image Defects85
  - Image Defect Examples85
  - Troubleshooting Image Defect86
- Troubleshooting for Software Problems100
  - Unable to Receive Data100
- Troubleshooting for Network Problems101
  - Cannot Make a Print through Network Connection101
  - Cannot Connect to Access Point101
- Troubleshooting for Control Panel Problems102
- Troubleshooting for Toner Cartridge and Drum Unit Problems103
- Troubleshooting for Fuser Unit Problems105
  - Fuser Unit Failure105
- Troubleshooting for Laser Unit Problems105
  - Laser Unit Failure105
- Troubleshooting for PCB Problems106
  - Main PCB Failure106
  - Full Memory106
- Troubleshooting for Other Problems107
Chapter 3 Disassembly/Reassembly110
Safety Precautions110
Packing111
Screw Catalogue112
Screw Torque List113
Lubrication115
Overview of Gears116
Harness Routing118
Disassembly Flow Chart125
Disassembly Procedure126
- Preparation126
- Back Cover127
- Outer Chute ASSY128
- Front Cover ASSY / Support Flap129
- Side Cover R132
- Fuser Cover133
- Inner Chute ASSY134
- Side Cover L135
- Top Cover ASSY136
- Fuser Unit140
- Low-Voltage Power Supply PCB ASSY142
- New Toner Sensor PCB ASSY144
- HVPS Flat Cable / High-Voltage Power Supply PCB ASSY145
- Fan147
- Relay PCB ASSY (for Toner Box Models and MP Models)148
  - Toner Box New PCB ASSY (for Models with Toner Box)148
- Laser Unit Flat Cable / Laser Unit150
- Filter152
- Wireless LAN PCB (Only for Wireless Network Models)153
- Roller Holder ASSY154
- Main PCB ASSY155
- T1 Clutch / Registration Clutch156
- Frame L Unit159
- Paper Feed Motor / Paper Feed Motor Flat Cable162
- Fuser Gear 64R/36R164
- Toner Sensor PCB ASSY (Only for Models with Toner Box)165
- Front Cover Sensor166
- Eject Sensor PCB ASSY167
- Registration Front/Rear Actuator Holder ASSY169
- Paper Feed Roller ASSY / Paper Feed Sensor PCB ASSY172
Chapter 4 Adjusting and Updating Settings as Required after Parts Replacement173
If You Replace the Main Pcb Assy173
- Setting by Spec174
- Installing Firmware (Sub Firmware and Main Firmware)176
  - Checking Firmware Version176
  - Installing Firmware177
- Setting Serial Number and Entering Adjusted Value of Laser Unit178
If You Replace the Low-Voltage Power Supply Pcb Assy181
- Reset Irregular Power Supply Detection Counter of the Low-Voltage Power Supply PCB181
If You Replace the Laser Unit182
- Entering Adjusted Value of Laser Unit183
Chapter 5 Service Functions185
Maintenance Mode185
- How to Enter Maintenance Mode185
  - Method of Entering Maintenance Mode for Service Personnel185
  - Method of Entering End-User Accessible Maintenance Mode186
- List of Maintenance Mode Functions187
  - List of Maintenance Mode Functions for LCD Models187
  - List of Maintenance Mode Functions Using [Go] (LED Models)188
- Details of Maintenance Mode Functions for LCD Models190
- Details of Maintenance Mode Functions Using [Go] (LED Models)226
Other Service Functions236
- Print Printer Settings236
- Drum Cleaning238
- Resetting Drum Counter240
- Change Active/Inactive Setting for Quiet Mode (LED Models Only)240
- Change Active/Inactive Setting for Auto Power down Mode (LED Models Only)241
- Change Active/Inactive Setting for Eco Mode (LED Models Only)241
- Change Active/Inactive Setting for Toner Save Mode (LED Models Only)241
- Change Continue/Stop Mode for Toner Cartridge (LED Models Only)242
Chapter 6 Wiring Diagram243
Chapter 7 Periodical Maintenance244
Periodical Replacement Parts244
Appendix 1 Serial Numbering System245
Appendix 2 Deleting User Setting Information246
Appendix 3 Installing the Maintenance Printer Driver247

Brand	Brother
Model	HL-L2371DN
Category	Printer
Language	English

Brother HL-L2371DN User Manual

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Brother HL-L2371DN Specifications

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