Samsung ML-1440 Service Manual - Page 45

Horizontal Black Band, Black/White Spot - toner

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Troubleshooting 4-2-3 Horizontal Black Band • Description 1. Dark or blurry horizontal stripes occur in the printing periodically. (They may not occur periodically.) Digital Printer Digital Printer Digital Printer Digital Printer Digital Printer Check and Cause 1. Bad contacts of the voltage terminals to developer. 2. The rollers of developer may be stained. Charge roller = 38.5mm Supply roller = 51mm Develop roller = 50mm Transfer roller = 56.8mm Solution 1. Clean each voltage terminal of the Charge, Supply, Develop and Transfer roller. (remove the toner particles and paper particles) 2. Clean the right Gear that has relatively small gap of the teeth in the OPC. 3. If the malfunction persists, replace the developer. 4-2-4 Black/White Spot • Description 1. Dark or blurry black spots occur periodically in the printing. 2. White spots occur periodically in the printing. Digital Printer Digital Printer Digital Printer Digital Printer Digital Printer Check and Cause 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 : 38.5 mm interval OPC drum : 96 mm interval) Solution 1. Run OPC cleaning Mode Print and run the Self-test 2 or 3 times. 2. If faded areas or voids occur in a black image at intervals of 96 mm, or black spots occur elsewhere, the OPC drum surface is damaged. 2. In case of 96 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. If a black image is partially broken, the transfer voltage is abnormal or the transfer roller's life has expired. 3. The transfer roller guarantees 125,000 sheets printing. If the roller's life is expired, replace it. 4. In case of 38.5 mm interval unremovable in 1, take measures as to replace the developer 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. Samsung Electronics 4-7

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Troubleshooting
4-7
Samsung Electronics
4-2-3
Horizontal Black Band
• Description
1. Dark or blurry horizontal stripes occur in the printing periodically.
(They may not occur periodically.)
Digital Printer
Digital Printer
Digital Printer
Digital Printer
Digital Printer
Check and Cause
Solution
1. Bad contacts of the voltage terminals to
developer.
2. The rollers of developer may be stained.
Charge roller
=
38.5mm
Supply roller
=
51mm
Develop roller
=
50mm
Transfer roller
=
56.8mm
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
developer.
4-2-4
Black/White Spot
• Description
1. Dark or blurry black spots occur periodically in the printing.
2. White spots occur periodically in the printing.
Digital Printer
Digital Printer
Digital Printer
Digital Printer
Digital Printer
Check and Cause
Solution
1. If dark or blurry black spots occur periodi-
cally, the rollers in the Developer may be
contaminated with foreign matte or paper
particles.
( Charge roller : 38.5 mm interval
OPC drum
: 96 mm interval)
2. If faded areas or voids occur in a black
image at intervals of 96 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 96 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 125,000
sheets printing. If the roller's life is expired,
replace it.
4. In case of 38.5 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.