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Troubleshooting ＞ Image formation problems
[CONFIDENTIAL]
(1-10)Black dots appear on the image
Print example Cause of trouble
1. Dirty charging roller
2. Flawed or dirty drum unit
1 Damaged or paper dust bitten cleaning blade
Defective part Check description Corrective Action
1
Drum unit Check the print image on paper has
a problem at an interval equivalent
to the circumference of the drum
(94.2mm).
If the drum has scratches, replace the drum unit.
2
Charging roller Check the print image on paper has
a problem at an interval equivalent
to the circumference of the charging
roller (29.9mm).
A problem is observed at a constant interval of the
charging roller (29.9 mm), replace the charging
roller.
3
Developer unit
Check the print image on paper has
a problem at an interval equivalent
to the circumference of the develop-
ing roller (44.9mm).
1. If the print image on paper has a problem at an
interval equivalent to the circumference of the
developer roller, clean the developer unit.
2. Replace the developer unit.
4
Transfer roller unit.
1. Check if the transfer roller is
contaminated on its surface or
damaged.
Replace the transfer roller unit.
5
Fuser unit Check the print image on paper has
a problem at an interval equivalent
to the circumference of the fuser
roller.
1. If the print image has a problem, clean the fuser
roller.
2. If cleaning does not help improve the symptom,
replace the fuser unit.
Check the fuser temperature
Change fixing temperature with service setting
(System Menu > Adjustment/Maintenance > Ser-
vice setting).Chenge the setting value to 2.
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