Samsung MultiXpress M5370 Series Service Manual page 393

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2) Vertical White Line, Band
Description : White vertical voids occurs in the printed image.
Probable Cause
The paper is not the proper type.
The paper path is contaminated by toner residue, debris etc.
The imaging unit is defective.
The transfer roller is contaminated or worn out.
The LSU window is contaminated.
The connection between the LSU and main board is defective.
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Solution
Replace the paper.
Clean the paper path.
Replace the imaging unit.
Replace the transfer roller.
1) Clean the LSU window.
2) Replace the LSU
1) Disconnect and reconnect the harness.
2) Replace the harness.
4. Troubleshooting
4-215

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