Image Quality Problems - Samsung Xpress C480 Series Service Manual

4. Alignment and Troubleshooting

4.2.3. Image quality problems

1) Vertical Black Line and Band
• Description : Straight thin black vertical line occurs in the printed image.
Cause and Check Point
Check if the surface of the charge roller is scratched or
contaminated.
Check if there are grooves on the circumference of the
OPC drum.
Check if the cleaning blade is damaged
Check if paper transfer belt is damaged or contaminated.
2) Vertical White Line
• Description : White vertical voids in the image.
Cause and Check Point
Check if the LSU window or internal lenses of LSU is
contaminated.
Check if there are scratches on the circumference of the
OPC drum.
Check if there are scratches on the circumference of the
developing roller.
Check if paper transfer belt is damaged or contaminated.
4-65
Solution
Replace the imaging unit and test again.
Replace the imaging unit and test again.
Replace the imaging unit and test again.
Replace the ITB unit and test again.
Solution
Clean the LSU window with recommended cleaner(IPA).
Clean the window with a clean cotton swab. If dirt is
inside the LSU, replace the LSU.
Replace the imaging unit and test again.
Replace the corresponding toner cartridge and test again.
Replace the ITB unit and test again.
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