Samsung SCX-472 series Service Manual page 110

4. Alignment and Troubleshooting
3) Horizontal Black Band
Description : Dark of blurry horizontal stripes occur in the printing periodically.
Check and cause
Bad contacts of the voltage terminals to toner cartridge.
The rollers of developer may be stained.
— OPC Drum = 75.49 mm
— Charge Roller = 26.7 mm
— Developing Roller = 36.75 mm
4) Black and White spot
Description : Dark or blurry black spots occur periodically in the printing.
Check and cause
If dark or blurry black spots occur periodically, the rollers in
the toner cartridge may be contaminated with foreign matte
or paper particles. (Charge roller : 26.7 mm interval / OPC
drum : 75.49 mm interval)
If faded areas or voids occur in a black image at intervals of
75.49 mm, the OPC drum surface is damaged.
If a black image is partially broken, the transfer voltage is
abnormal or the transfer roller's life has expired.
4-43
Solution
Clean each voltage terminal of the Charge, Magnetic, toner
cartridge and Transfer roller. (remove the toner particles
and paper particles)
Replace the toner cartridge.
Solution
Clean each voltage terminal of the Charge, Magnetic, toner
cartridge and Transfer roller. (remove the toner particles
and paper particles)
Replace the toner cartridge.
If the transfer roller's life is expired, replace it.
•
Clean the inside of the set against the paper particles
•
and foreign matter in order not to cause the trouble.
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