Brother MFC-L2732DW

Completely blank

User Check

• Replace the drum unit with a new one.
• Replace the toner cartridge with a new one.
• Install the latest main firmware.

Step	Cause	Remedy
1	Connection failure of the laser unit flat cable	Reconnect the laser unit flat cable.
2	Laser unit attachment failure	Reattach the laser unit.
3	Laser unit flat cable failure	Replace the laser unit flat cable.
4	Dirt on the electrodes of the high-voltage power supply PCB and those of the machine	Clean the electrodes of the high-voltage power supply PCB and those of the machine.
5	Laser unit failure	Replace the laser unit.
6	Main PCB failure	Replace the main PCB ASSY.

Image distortion

Step	Cause	Remedy
1	Laser unit attachment failure	Reattach the laser unit.
2	Laser unit failure	Replace the laser unit.
3	Main PCB failure	Replace the main PCB ASSY.

All black

User Check

• Clean the corona wire of the drum unit.
• Replace the drum unit with a new one.

Step	Cause	Remedy
1	Dirt on the electrodes of the drum unit and those of the machine	Clean the electrodes of the drum unit and those of the machine.
2	Laser unit flat cable failure	Replace the laser unit flat cable.
3	Dirt on the electrodes of the high-voltage power supply PCB and those of the machine	Clean the electrodes of the high-voltage power supply PCB and those of the machine.
4	High-voltage power supply PCB failure	Replace the high-voltage power supply PCB ASSY.
5	Laser unit failure	Replace the laser unit.
6	Main PCB failure	Replace the main PCB ASSY.

Dirt on back side of paper

User Check

• This problem may disappear after printing multiple sheets of paper.
• Replace the drum unit with a new one.

Step	Cause	Remedy
1	Dirt in the paper feed system	Wipe dirt off.
2	Dirt on the fuser unit	Replace the fuser unit.
3	High-voltage power supply PCB failure	Replace the high-voltage power supply PCB ASSY.

Vertical streaks

User Check

• Clean the corona wire of the drum unit.
• Return the corona wire cleaning tab to the “▲” position.
• This problem may disappear after printing multiple sheets of paper.
• Refer to <How to clean the drum unit> to remove the dirt from the exposure drum using a cotton applicator.
• Replace the drum unit with a new one.
• Replace the toner cartridge with a new one.

Step	Cause	Remedy
1	Dirt in the paper feed system	Wipe dirt off.
2	A ground wire or ground plate installation failure (Grounding is not performed correctly.)	Retighten the screws of each ground wire or ground plate. Repair the bend of the tray ground spring of the paper tray. (Refer to the figure below.)
3	Dirt on the exposure drum	Perform drum cleaning. (Refer to “2.1 Drum Cleaning” in Chapter 5.)
4	Dirt on the cleaner pinch roller of the fuser cover	Replace the cleaner pinch roller S ASSY.
5	Dirt on the fuser unit	Replace the fuser unit.
6	Laser unit failure	Replace the laser unit.