Samsung MultiXpress X4 Series Service Manual page 492

4. Troubleshooting
4.7.3. Horizontal periodic Black Band or Dot
A. Typical faulty images
B. Troubleshooting procedure
Step Cause
1 Horizontal periodic dot. (CR, 37.7mm)
• The surface of the charge roller(CR) is
contaminated.
• CR is scratched.
2 Horizontal periodic black band.(CR, 37.7mm)
• CR is inferior in quality.
3 OPC is damaged.
4-242
Action
Wipe the surface of contaminated part with a soft cloth
and alcohol.
Replace the Drum unit.
(Refer to 3.3.2.1.)
Replace the Drum Unit.
(Refer to 3.3.2.1.)
Replace the Drum Unit.
(Refer to 3.3.2.1.)
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