Samsung ProXpress M453x series Service Manual page 202

4. Troubleshooting
3) Horizontal Black Band
Description : Dark of blurry horizontal stripes occur in the printing periodically.
Probable Cause
The paper is dirty or not the proper type.
The paper path is contaminated by toner residue, debris etc.
The contact terminal of the imaging unit is bad.
The surface of transfer roller is contaminated or worn out.
The LSU window is contaminated.
The pressure roller or heat roller in fuser unit defective.
HVPS terminal is contaminated.
The output from the HVPS is abnormal.
NOTE
Roller period table
Roller
Charge roller
OPC drum
Developing roller
Supply roller
Pressure roller
Transfer roller
4-107
Period
38.31 mm
94.20 mm
62.49 mm
56.21 mm
54.95 mm
28.89 mm
Solution
Replace the paper.
Clean the paper path.
1) Clean the contact terminal of the imaging unit.
2) Replace the imaging unit.
Replace the transfer roller.
1) Clean the LSU window.
1) Turn the machine off.
2) Remove and replace the fuser unit.
3) Turn the machine on.
WARNING
Do not touch the fuser unit while it is hot.
Clean the contaminated terminal.
Replace the HVPS board.
Replacement part
Imaging unit
Fuser unit
Transfer roller
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