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White spots on image
<User Check>
• Check that the fan is not clogged.
• Refer to <How to clean the drum unit> to remove the dirt from the
exposure drum using a cotton applicator.
• Replace the drum unit with a new one.
• Replace the toner cartridge with a new one.
Step
Dirt on the paper dust
1
cleaning roller of the paper
tray
Dirt on the exposure drum
2
3
Clogged filter
Scratch or dirt on the fuser
4
unit
High-voltage power supply
5
PCB failure
Note:
Image defects which appear periodically may be caused by failure of rollers. Refer to the
table below and determine the cause based on the pitch at which defects appear on the
image.
<Pitches on images caused by rollers>
Part name
Develop roller
Exposure drum
Heat roller of the fuser unit
Pressure roller of the fuser unit
< Examples of image distortion >
White dots repeat in A mm distance on
the black page with printed images.
Refer to the <Pitches on images caused by roll ers> table above for what represents the value A.
Cause
Refer to the Fig. 2-14 (P2-73) to clean the
paper dust cleaning roller.
Perform drum cleaning.
(Refer to "2.1 Drum Cleaning" in Chapter 5.)
Clean the filter.
Replace the fuser unit.
Replace the high-voltage power supply PCB
ASSY.
The pitch which
appears in the image
26.5 mm
94.5 mm
78.5 mm
78.5 mm
A mm
A mm
Black dots repeat in A mm
distance on the page.
Fig. 2-19
Remedy
A mm
A mm
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