Dell 1600n - Multifunction Laser Printer B/W, Service Manual

Page: 101 / 189

Troubleshooting
Service Manual
7-11
7.3.3 Horizontal Black Band
• Description
1. Dark or blurry horizontal stripes occur in the printing periodically.
(They may not occur periodically.)
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Check and Cause Solution
1. Bad contacts of the voltage terminals to
developer.
2. The rollers of developer may be stained.
Charge roller = 37.7 mm
Supply roller = 37 mm
Develop roller = 35.3 mm
Transfer roller = 45.3 mm
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 a relatively
small gap of the teeth in the OPC.
3. If the malfunction persists, replace the
developer.
7.3.4 Black/White Spot
• Description
1. Dark or blurry black spots occur periodically in the printing.
2. White spots occur periodically in the printing.
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Check and Cause Solution
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 : 37.7 mm interval
OPC drum : 75.5 mm interval)
2. If faded areas or voids occur in a black
image at intervals of 75.5 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 75.5 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 60,000
sheets printing. If the roller's life is expired,
replace it.
4. In case of 37.7 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.