What to do if my Brother HL-4040CN, HL-4050CDN, HL-4070CDW has a 'Color registration sensor failure'?
If your Brother printer is showing a 'Color registration sensor failure', turn the power off and then back on again.
What to do if my Brother HL-4040CN, HL-4050CDN, HL-4070CDW Printer has a paper jam while turning it over in duplex printing?
If your Brother printer is experiencing a paper jam while duplex printing, or a DX solenoid failure, pull Tray 1 completely out. Inspect inside the machine, or open the back cover to remove the jammed paper.
What to do if my Brother HL-4040CN, HL-4050CDN, HL-4070CDW Printer says 'Waste Toner Box Full'?
If your Brother printer indicates that the waste toner box is full, you should replace it with a new one.
What to do if my Brother HL-4040CN, HL-4050CDN, HL-4070CDW says 'Waste Toner Soon'?
If your Brother printer displays a 'Waste Toner Soon' message, replace the waste toner box with a new one.
What to do if my Brother Printer has a fuser unit failure?
If your Brother printer experiences a fuser unit failure, turn the power off and then back on again. Allow the machine to sit for 15 minutes.
Why is my Brother HL-4040CN, HL-4050CDN, HL-4070CDW Printer showing an 'Air intake fan (AIR) failure'?
An 'Air intake fan (AIR) failure' in your Brother printer can be due to several reasons: * A harness connection failure. Check the harness connection of the air intake fan (AIR) and reconnect it. * The fan itself might be failing. Check the fan performance following the procedure described in 'Maintenance mode 78'. If any problem occurs, replace the air intake fan (AIR). * Engine PCB failure. In this case, replace the engine PCB ASSY.
What to do if my Brother Printer has a 'Drum drive motor 1 (K, Y) failure'?
If your Brother printer shows a 'Drum drive motor 1 (K, Y) failure', turn the power off and then back on again.
What to do if my Brother HL-4040CN, HL-4050CDN, HL-4070CDW has a 'Density sensor failure'?
If your Brother printer shows a 'Density sensor failure', turn the power off and then back on again.
What to do if my Brother Printer has a 'Density sensor shutter performance malfunction'?
If your Brother printer is experiencing a 'Density sensor shutter performance malfunction', turn the power off and then back on again.
How to fix 'NVRAM failure on engine PCB' in my Brother HL-4040CN, HL-4050CDN, HL-4070CDW Printer?
If your Brother printer displays an 'NVRAM failure on engine PCB', this is due to an Engine PCB failure, and the suggested solution is to replace the engine PCB ASSY.
Specifies the printer models covered by the service manual.
Details error messages, codes, and troubleshooting procedures for malfunctions.
Covers consumable and replacement parts and their maintenance procedures.
Provides procedures for disassembling and assembling machine parts.
Details adjustments needed after replacing main PCB or other parts.
Describes maintenance mode, settings, and hidden functions.
Provides circuit and wiring diagrams for PCB connections.
Lists essential precautions to prevent secondary problems during troubleshooting.
Details items to check before attempting machine repair.
Lists error codes, their indications, and causes/remedies.
Covers issues related to paper feeding, such as no feeding or double feeding.
Addresses problems related to print quality and image defects.
Outlines essential safety measures to follow during maintenance.
Details the step-by-step process for removing various machine components.
Provides caution for servicing the laser product with open covers.
Lists critical warnings regarding high voltage electrodes and handling plugs.
Lists error codes, their problems, and cross-references to remedies.
Lists errors that users can resolve by following LCD messages or user checks.
Lists parts recommended for periodic replacement based on service life.
Provides step-by-step instructions for replacing the fuser unit and toner filter frame assembly.
Details procedures for rewriting firmware and setting parameters after main PCB replacement.
Explains how to enter and use the machine's maintenance mode.
Provides steps to enter the general maintenance mode.
Explains how to access limited maintenance functions for end users.
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General