Samsung CLX-8640 series Service Manual page 425

5) Incorrect color registration
Step Section
1 OPC-ACR
2 OPC coupling
3 ITB unit
4
5 LSU
6 HVPS board
7 OPC-ACR
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Check item
Perform the OPC-ACR. (Diagnostics
> Color Management > Full Color
Registration)
There is still color shift.
Check if the OPC couplings of the drum
unit and main drive unit are defective.
Is the transfer belt unit installed normally?
• Deformation or damage of the
transfer belt or stains on the transfer
belt.
Stain or damage of the drive roller.
•
• Check if the couplings of the transfer
unit.
Print the line image. Are the lines bent?
Check the connection of the high voltage
supply terminal of the 1st or 2nd transfer
rollers.
Perform OPC-ACR.
4. Troubleshooting
Result Action
Yes Go to following checks.
Yes 1) If the coupling of the drum
unit is defective, replace the
drum unit.
2) If the coupling of the main
drive unit is defective,
replace the main drive unit.
No Remove and re-install the ITB
unit.
Yes Clean or replace the ITB unit.
Yes Replace the LSU.
Yes Replace the HVPS board.
After finishing service, please
perform OPC-ACR and recheck
again.
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