Check and Cause Solution
1. Bad contacts of the voltage terminals to
print cartridge.
2. The rollers of print cartridge may be
stained.
Charge roller = 38mm
Develop roller = 45mm
Transfer roller = 55mm
OPC Drum = 95mm
1. Clean each voltage terminal of the Charge,
Supply, Develop and Transfer roller.
(remove the toner particles and paper par-
ticles)
2. Clean the right Gear that has relatively
small gap of the teeth in the OPC.
3. If the malfunction persists, replace the
print cartridge.
6.2.4 Black/White Spot
• Description
1. Dark or blurry black spots occur periodically in the printing.
2. White spots occur periodically in the printing.
Check and Cause Solution
1. If dark or blurry black spots occur periodi-
cally, the rollers in the print cartridge may
be contaminated with foreign matte or
paper particles.
( Charge roller : 38 mm interval
OPC drum : 95 mm interval)
2. If faded areas or voids occur in a black
image at intervals of 95 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 trans-
fer roller's life has expired.
1. Run OPC cleaning Mode Print and run the
Self-test 2 or 3 times.
2. In case of 95 mm interval unremovable in
1, cleanly remove foreign substances stuck
on the OPC location equivalent to black
spots and white spots with a dry duster.
3. The transfer roller guarantees 150,000
sheets printing in normal environment. If
the roller's life is expired, replace it.
4. In case of 38 mm interval unremovable in
1, take measures as to replace the
print
cartridge and try to print out.
5. Clean the inside of the set against the
paper particles and foreign matter in order
not to cause the trouble.
Troubleshooting
Samsung Electronics
Service Manual
6-3
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