Samsung ML-6050 Service Manual page 41

Error code 1-061
Fault
Dark image (2)
Description
The printed image is dark.
Check
Engine board
Cause
1. No supply or bias voltage at the engine board
(Perform DCU diagnostic code '04' to measure the voltage).
Solution
1-1. Check the following parts :
U201(KA324), Q204(D526-Y), T204, U203 (SN7407N),
resistors, diodes in the output and feedback area.
1-2. Refer to the following information.
U203(7407N)'s pin #1; pulse input, pin #2; pulse output.
Remark
Others
Samsung Electronics
Troubleshooting
Model ML-xxxx
5-9