Brother DCP-L3510CDW, Service Manual

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2-134
Confidential
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Unstable color density
■
Hollow print
<User Check>
• Make a print on a different type of paper.
• Replace the belt unit with a new one.
• Replace the waste toner box with a new one.
• Replace the toner cartridge with a new one.
• 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. (Refer to
Fig. 2-11 (P2-
78) and Fig. 2-12 (P2-78) .)
2
Dirt on the electrodes of the
belt unit and those of the
machine Clean the electrodes of the belt unit and
those of the machine. (Refer to
Fig. 2-11 (P2-
78) and Fig. 2-16 (P2-119) .)
3
High-voltage power supply
PCB failure Replace the high-voltage power supply PCB.
4 LED ASSY failure Replace the appropriate LED ASSY.
5 Main PCB failure Replace the main PCB.
<User Check>
• Check the usage environment of the machine. Using the machine in
hot-humid or cold-dry conditions can cause this problem.
• Refer to <How to clean the drum unit> to remove the dirt from the
exposure drum using a cotton applicator.
• Replace the toner cartridge with a new one.
• Replace the drum unit with a new one.
Step Cause Remedy
1
Dirt on the paper dust
cleaning roller of the T1 Refer to the Fig. 2-13 (P2-106) to clean the
paper dust cleaning roller.
2
Scratch or dirt on the fuser
unit Replace the fuser unit.
3
High-voltage power supply
PCB failure Replace the high-voltage power supply PCB.