Brother DCP-L8400CDN, Руководство по обслуживанию

Страница: 127 / 515

2-97
Confidential
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 machine’s environment. High temperature and high humidity
or low temperature and low humidity 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.
- Wipe the scanner windows of the laser unit with a soft, lint-free cloth.
- Leave the machine for a while as the power remains ON.
(Condensation)
- Check if paper is not damp.
Step Cause Remedy
1 Dirt on the electrodes of the
main body and the drum unit Clean the electrodes of the main body and
the drum unit.
(Refer to
Fig. 2-7 (P2-55) , Fig. 2-8 (P2-55) .)
2 Dirt on the electrodes of the
high-voltage power supply
PCB Clean the electrodes of the high-voltage
power supply PCB.
3 Dirt on the density sensor Clean the density sensor.
4 Density sensor failure Replace the registration mark sensor unit.
5 Fuser unit failure Replace the fuser unit.
6 High-voltage power supply
PCB failure Replace the high-voltage power supply PCB
ASSY.
7 Main PCB failure Replace the main PCB ASSY.