Brother DCP-L5500D, Service Manual

Page: 132 / 408

2-97
Confidential

Faulty registration
 Dark
<User Check>
• Check that the appropriate paper type is selected in the
driver.
• Install the latest main firmware.
Step Cause Remedy
1
Wrong adjusted value of laser unit
entered Refer to “3.1 Entering Adjusted Value of
Laser Unit” in Chapter 4 , and enter the
adjusted value of the laser unit correctly.
2
Entered adjusted value for TT left-
end printing position / upper-end
printing position was wrong.
Refer to “1.3.13 Change USB No. return
value / Adjust left-end print position / Adjust
upper-end print position / Set HEXDUMP
Mode (function code: 45)” in Chapter 5
to
adjust the writing start position.
3
Registration rear actuator coming
off Reattach the registration rear actuator.
4 Distortion at TT assembly Reattach the TT.
5 Laser unit failure Replace the laser unit.
6 Main PCB failure Replace the main PCB ASSY.
<User Check>
• Check the usage environment of the machine. Using the machine in
hot-humid or cold-dry conditions can cause this problem.
• If a new toner cartridge has been detected, check that it was not
replaced with another toner cartridge.
• 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 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
Dirt on the electrodes of the
machine Clean the electrodes of the machine.
(Refer to
Fig. 2-9 .)
4
High-voltage power supply PCB
failure Replace the high-voltage power supply PCB
ASSY.
5 Main PCB failure Replace the main PCB ASSY.
6 Laser unit failure Replace the laser unit.