Samsung CLX-8640 series Service Manual page 423

3) Spot
Step Section
1 Drum Unit
2
3
4 Scanner
5
6
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Check item
The surface of the OPC drum is scratched.
Dirty on the outside.
Developing bias contact terminal makes
good connection.
Original is damaged or dirty.
DADF pad is dirty
Original glass is dirty.
4. Troubleshooting
Result Action
Yes Replace the drum unit.
Yes Clean.
No Clean contact terminal and check
terminal position.
Yes Change original.
Yes Clean or replace the pad.
Yes Wipe the surface clean with a soft
cloth.
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