Samsung ML-6050 Service Manual page 36

Troubleshooting
Error code 1-040
Fault
Black or white spots
Description
Dark or blurry black or white spots occur periodically.
Check
1. Developer cartridge
2. Transfer voltage
3. Transfer roller's life
Cause
1. If dark or blurry black spots occur periodically, the rollers in the Developer may be contaminated
with foreign matter or paper particles.
(Charge roller : 37 mm interval, OPC drum : 94 mm interval).
2. If faded areas or voids occur in a black image at intervals of 94 mm, or black spots occur
elsewhere, the OPC drum surface is damaged.
3. If a black image is partially broken, the transfer voltage is abnormal or the transfer roller's life has
expired.
Solution
1. Run OPC cleaning to remove excess toner and paper particles on the charge roller and OPC drum.
Repeat 2 or 3 times. Run the self-test. If the same problem persists, replace the developer.
2. Clean the rollers. If problem persists, replace the Developer.
3. The transfer roller guarantees 50,000 sheets printing. If the roller's life is expired, replace it.
Remark
Others
5-4
Model ML-xxxx
Samsung Electronics