Brother DCP-L8400CDN, Руководство по обслуживанию

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2-110
Confidential
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One color band
< User Check >
- Clean the corona wire of all four colors on the drum unit.
- Return the cleaning tab of the corona wire to the position.
- This symptom might stop occurring after making several prints.
- Refer to the User’s guide and remove the dirt on the exposure drum using a cotton swab.
- Replace the drum unit with a new one.
- Replace the toner cartridge with a new one.
■
Downward fogging of solid color
■
Horizontal lines
Step Cause Remedy
1 Installation failure of each FG
wire and/or FG plate
(Grounding is not performed
correctly.)
Retighten the screws of each FG wire and/or
FG plate. Repair the bend of the tray ground
spring of the paper tray.
(Refer to Fig. 2-13 (P2-104) .)
2 Dirt on the exposure drum Perform drum cleaning.
(Refer to “2.2 Drum Cleaning” in Chapter 5 .)
3 Laser unit failure Replace the laser unit.
< User Check >
- Replace the toner cartridge with a new one.
Step Cause Remedy
1 High-voltage power supply
PCB failure
Replace the high-voltage power supply PCB
ASSY.
2 Main PCB failure Replace the main PCB ASSY.
< User Check >
- This symptom might stop occurring after making
several prints.
- Refer to the User’s guide and remove the dirt on the
exposure drum using a cotton swab.
- Replace the drum unit with a new one.
- Replace the toner cartridge with a new one.
Step Cause Remedy
1 Dirt on charged electrode
Clean the electrodes of the drum unit and
main body.
(Refer to Fig. 2-8 (P2-55) , Fig. 2-7 (P2-55) .)
2 Dirt on the exposure drum Perform drum cleaning.
(Refer to “2.2 Drum Cleaning” in Chapter 5 .)
3 Scratch and dirt on fuser unit Replace the fuser unit.
4 High-voltage power supply
PCB failure
Replace the high-voltage power supply PCB
ASSY.