Brother DCP-L3510CDW, Service Manual

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4.3.2 Troubleshooting image defect
Image defect related problems are end user recoverable if following the User Check items. If
the same problem occurs again, follow each procedure in the order of the number described in
the Step column in the tables below.
■
Light on the whole page
<User Check>
• Check the usage environment of the machine. Using the machine in
hot-humid or cold-dry conditions can cause this problem.
• If the whole page is light, toner save mode may be ON. Turn OFF the
toner save mode.
• Adjust the color calibration from the control panel.
• Replace the drum unit with a new one.
• Replace the toner cartridge with a new one.
• Replace the belt unit with a new one.
• Turn ON the power switch, and leave the machine for a while
(condensation).
• Check if paper is not damp.
• Use specified paper.
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
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.
3 Dirt on the density sensor Clean the registration mark sensor L.
4 Density sensor failure Replace the registration mark sensor L PCB.
5 Fuser unit failure Replace the fuser unit.
6
High-voltage power supply
PCB failure Replace the high-voltage power supply PCB.
7 Main PCB failure Replace the main PCB.