Samsung ML-6050 Service Manual page 47

Error code 1-091
Fault
Ghost (3)
Description
When xerographic paper is used in ADF, ghost occurs at 94 mm intervals.
Check
Engine board
Cause
1. No minus (-) transfer voltage output from the engine board.
(Normal voltage : 1250 -1450V with 660 Mohm load)
2. The (+) transfer voltage may be abnormal when performing DCU #13 with 660 Mohm load on the
transfer voltage output. (Normal voltage: 2200V (+30/-30V) DCU #14, 3250-3350V DCU #13).
Solution
Check the following parts :
U201(KA324), Q207(A708), Q202(KSD526-Y), T201, U203 (SN7407),
resistors, or diodes in the output and feedback area.
Remark
Others
In case of no minus transfer output voltage, image quality may be poor, and background may occur in
the printing.
Samsung Electronics
Troubleshooting
Model ML-xxxx
5-15