Image Quality Problem - Samsung ProXpress M337x Service Manual

4.2.3. Image quality problem

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