Samsung CLX-8640 series Service Manual page 256

4. Troubleshooting
• Check the signal and power with the DVM. (Refer to 5. System Diagram.)
• If the checked result is normal, replace the motor(JC31-00123C).
• If the checked result is abnormal, check the following.
- If 24V power is not generated, replace the SMPS
-
If the control signal is abnormal, replace the main board(JC92–02516A).
b) If the motor is operational,
• Check the Pin Num 8. If the value is abnormal, replace the main board. If the value is normal, replace
the harness.
4-97
board(JC44–00150B(220V) /
Copyright© 1995-2013 SAMSUNG. All rights reserved.
JC44–00149B(110V)).