Brother MFC-L6900DW - Poor Fixing

2-98
Confidential
 Poor fixing
 Completely blank
<User Check>
• Check the usage environment of the machine. Using the machine in
hot-humid or cold-dry conditions can cause this problem.
• Clean the corona wire of the drum unit.
• Replace the drum unit with a new one.
• Replace the toner cartridge with a new one.
Step Cause Remedy
1
Dirt on the electrodes of the toner
cartridge and those of the machine
Clean the electrodes of the toner cartridge
and those of the machine. (Refer to Fig. 2-8
and Fig. 2-9.)
2 Fuser unit failure Replace the fuser unit.
3
High-voltage power supply PCB
failure
Replace the high-voltage power supply PCB
ASSY.
4
Low-voltage power supply PCB
failure
Replace the low-voltage power supply PCB
ASSY.
5 Laser unit failure Replace the laser unit.
6 Main PCB failure Replace the main PCB ASSY.
<User Check>
• Clean the corona wire of the drum unit.
• 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
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. (Refer to Fig. 2-8 and
Fig. 2-9.)
2
Dirt on the electrodes of the toner
cartridge and those of the machine
Clean the electrodes of the toner cartridge
and those of the machine. (Refer to Fig. 2-8
and Fig. 2-9.)
3
Connection failure of the laser unit
flat cable
Reconnect the laser unit flat cable.
4 Laser unit attachment failure Reattach the laser unit.
5 Laser unit flat cable failure Replace the laser unit flat cable.
6
Dirt on the electrodes of the
machine
Clean the electrodes of the machine.
(Refer to Fig. 2-9.)
7 Laser unit failure Replace the laser unit.
8 Main PCB failure Replace the main PCB ASSY.