Samsung ML-6050 Service Manual page 40

Troubleshooting
Error code 1-060
Fault
Dark image (1)
Description
The printed image is dark.
Check
Engine board
Cause
1. No charge voltage in the engine board. (Perform DCU diagnostic code '01' to measure the voltage).
Solution
1-1. Check the following parts :
U201(KA324), Q211(C1008), Q201(D526-Y), T202, U203 (SN7407N),
resistors, diodes in the output and feedback area.
1-2. Clean the high voltage terminal on the engine and its PBA.
1-3. Refer to the following information.
U201(KA324)'s pin #12, #13 ; 2.5~2.9 V, pin #14 ; 5.5~8.5 V
For standby, pin #13 ; 2.7V, pin #12 & #14 ; 0V
Q201's operating voltage ; base=+2~2.5 V, emitter=0~1 V collector=30~60 V
U203(7407N)'s pin #1 ; 0V input, pin #2 ; 0V output
Remark
Others
5-8
Model ML-xxxx
Samsung Electronics