Horizontal Black Band - Xerox Phaser 3450 Service Manual

TROUBLESHOOTING

7.1.3 Horizontal Black Band

1. Dark or blurry horizontal stripes occur in the printing periodically.
• Description
(They may not occur periodically.)
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7.1.4 Black/White Spot
1. Dark or blurry black spots occur periodically in the printing.
• Description
2. White spots occur periodically in the printing.
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Service Manual
7-2
Check and Cause
1. Bad contacts of the voltage terminals to
toner cartridge.
2. The rollers of toner cartridge may be
stained.
Charge roller = 38mm
Supply roller = 45mm
Develop roller = 49mm
Transfer roller = 57mm
Check and Cause
1. If dark or blurry black spots occur periodi-
cally, the rollers in the Toner 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.
Solution
1. Clean each voltage terminal of the Charge,
Supply, Develop and Transfer roller.
(remove the toner particles and paper par-
ticles)
2. Clean the left Gear that has relatively
small gap of the teeth in the OPC.
3. If the malfunction persists, replace the
toner cartridge.
Solution
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 10,000
sheets printing. If the roller's life is expired,
replace it.
4. In case of 95 mm interval unremovable in 1,
take measures as to replace the toner car-
tridge 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.