One Color Spots Or Dirt - Brother MFC-9130CW Service Manual

■ 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 or toner cartridge with a new one.
Step
1 Scratch and dirt on fuser unit
2 High-voltage power supply
PCB failure
3 Main PCB failure
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.
<Diameters of rollers and pitches on images>
No.
1 Develop roller
2 Exposure drum
3 Heat roller of the fuser unit
4 Pressure roller of the fuser unit
Cause
Replace the fuser unit.
Replace the high-voltage power supply PCB
ASSY.
Replace the main PCB ASSY.
Part name
2-98
Remedy
The pitch which
Diameter
appears in the image
Ø
13 mm 24.7 mm
Ø
30 mm 94.2 mm
Ø
21 mm 66 mm
Ø
25 mm 78.5 mm
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