Samsung MultiXpress K4 Series Service Manual page 306

4. Troubleshooting
i) Check the signal and power with the DVM.
ii) If the checked result is normal, replace the BLDC motor(JC31-00123B).
iii) If the checked result is abnormal, check the following.
- If 24V power is not generated, replace the SMPS board
- if the control signal is abnormal, replace the main board(JC92–02746A)
b) If the motor is operational, check the Pin Num 8.
i) If the value is abnormal, replace the main board.
ii) If the value is normal, replace the harness.
4-71
(JC44-00100C (220V) / JC44-00093C
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(110V)).