Samsung SL-M4580FX Service Manual page 231

8) Background
Description : Light dark background appears in whole area of the printing.
Probable Cause
Does recycle paper be used?
The life of the imaging unit has been expired
The output from the HVPS is abnormal.
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Solution
Use the proper papers.
Replace the imaging unit.
Replace the HVPS board.
4. Troubleshooting
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