Samsung CLX-8640 series Service Manual page 429

9) Stain on the paper back side
Step Section
1 Transfer Roller Assy
2 ITB Unit
3
4 Fuser Unit
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Check item
Is the transfer roller dirty or worn out?
Is there any stain caused by a poor cleaning,
etc. on the transfer belt?
Is the transfer belt cleaning blade in proper
contact with the transfer belt?
Are the fuser belt and pressure roller dirty?
4. Troubleshooting
Result Action
Yes Clean or replace the Transfer roller
Assy.
Yes Clean the transfer belt.
Yes Take off the ITB unit. Check if
the transfer belt cleaning blade
contacts the belt and side plate is
assembled correctly.
Yes Clean the fuser belt and pressure
roller.
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