4. Troubleshooting
4.4. Image quality problem
1)
Vertical Black Line and Band
Description : Straight thin black vertical line occurs in the printed image.
Check and cause
Solution
•
Damaged develop roller in the toner system.
Deformed Doctor-blade or cleaning-blade.
•
Scratched surface of the charge roller in the toner
system.
Replace the laser toner cartridge or imaging unit.
Partly depression or deformation on the surface of the
transfer roller.
Replace the transfer roller.
2)
Vertical White Line
Description : White vertical voids occurs in the printed image.
Check and cause
Solution
Foreign matter stucks onto the window of internal lenses of
LSU mirror.
Clean the LSU window with recommended cleaner (IPA).
Clean the window with a clean cotton swab.
The life of the laser toner cartridge or imaging unit has been
expired.
Replace the laser toner cartridge or imaging unit.
Some foreign substances are on the window of the imaging
unit frame.
Remove the foreign matter of the exposure window.
If the fuser is defective, voids occur periodically at the top
of a black image.
Open the rear cover. Reinstall the fuser unit.
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