Brother HL-L8250CDN, Service Manual

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2-101
Confidential
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One color spots or dirt
<User Check>
- Check if damp paper is used.
- 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.
- Replace the belt unit with a new one.
<Pitches on images caused by rollers>
Step Cause Remedy
1 Paper dust is accumulated Clean the paper dust cleaning roller.
(Refer to
Fig. 2-12 (P2-100) .)
2 Dirt on the exposure drum Perform drum cleaning.
(Refer to
“2.2 Drum Cleaning” in Chapter 5 .)
3 Toner filter is clogged Clean the toner filter.
4 Scratch and dirt on fuser unit Replace the fuser unit.
5 High-voltage power supply
PCB failure Replace the high-voltage power supply PCB
ASSY.
Note:
Image defects which occur periodically may be caused by a failure of the rollers.
Use the diameters of the rollers or the pitches which appear in images shown in the table
below to identify the cause of the problem.
Part name
The pitch which
appears in the image
Develop roller 30 mm
Exposure drum 94 mm
Heat roller of the fuser unit 78.5 mm
Pressure roller of the fuser unit 78.5 mm