Samsung ML-1665 Service Manual - Page 75

Black/White Spot, Description, Dark or blurry spots occur periodically in the printing

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Alignment and Troubleshooting 4) Black/White Spot Description : 1 . Dark or blurry spots occur periodically in the printing 2. White spots occur periodically in the printing 1. If dark or blurry black spots occur periodically, the rollers in the Developer may be contaminated with foreign matte or paper particles. (Charge roller : 26.7mm interval OPC drum : 62.9mm interval) Run the Self-test 2 or 3 times. 2. If faded areas or voids occur in a black image at intervals of 62.9mm, 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. In case of 62.9mm 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 30,000 sheets printing. If the roller's life is expired, replace it. 2. In case of 39.2 mm interval unremovable in 1, take measures as to replace the develop-er 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. Service Manual 4-27 Samsung Electronics

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Alignment and Troubleshooting
Service Manual
4-27
Samsung Electronics
4) Black/White Spot
Description :
1. Dark or blurry spots occur periodically in the printing
2. White spots occur periodically in the printing
3. If a black image is
partially broken, the transfer voltage is
abnormal or the transfer roller's
life has expired.
2. If faded areas or voids
occur in a black image at intervals
of 62.9mm, or black spots occur elsewhere,
the OPC drum surface is
damaged.
In case of 62.9mm 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
30,000 sheets printing. If the
roller's life is expired, replace it.
2. In case of 39.2 mm interval
unremovable in 1, take measures
as to replace the develop-er
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.
Run the Self-test 2 or 3 times.
1. If dark or blurry
black spots occur periodically,
the rollers in the Developer may be conta-
minated with foreign matte or paper particles.
(Charge roller : 26.7mm interval
OPC drum : 62.9mm interval)