Samsung ML-3471ND/XAX Service Manual page 95

4) Black/White Spot
Description: 1. Dark or blurry spots occur periodically in the printing
2. White spots occur periodically in the printing
Digital Printer
Digital Printer
Digital Printer
Digital Printer
Digital Printer
black spots occur periodically, black spots occur periodically,
the rollers in the Toner cartridge may the rollers in the Toner cartridge may
be contaminated with foreign matte or be contaminated with foreign matte or be contaminated with foreign matte or
( Charge roller : 37.7 mm interval ( Charge roller : 37.7 mm interval ( Charge roller : 37.7 mm interval
voids occur in a black image
at intervals of 95 mm, or black spots
occur elsewhere, the OPC drum
partially broken, the transfer
voltage is abnormal or the transfer
Samsung Electronics
1. If dark or blurry 1. If dark or blurry
oner cartridge may
paper particles. paper particles.
OPC drum : 75.5 mm interval) OPC drum : 75.5 mm interval) OPC drum : 75.5 mm interval)
2. If faded areas or
surface is damaged.
3. If a black image is
roller's life has expired.
Adjustment and Troubleshooting
Run OPC cleaning Mode Print
and run the Self-test 2 or 3 times.
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.
1. The transfer roller guarantees
100,000 sheets printing. If the
roller's life is expired, replace it.
2. In case of 95 mm interval
unremovable in 1, take measures
as to replace the toner cartridge
and try to print out.
3. Clean the inside of the set
against the paper particles and
foreign matter in order not to
cause the trouble.
Service Manual
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