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e-STUDIO3511/4511 TROUBLESHOOTING 5 - 124 November 2003 © TOSHIBA TEC
(15) Color banding (at right angles to feeding direction)
Feeding direction
Cause/Section
Main charger
Fuser unit
High-voltage
transformer
(main charger wire/grid
and transfer roller bias)
Drum
2nd transfer roller
Scanner
Step
1
2
3
4
5
6
7
8
9
Check items
Is the charger wire dirty or deformed?
Is the fuser belt, pressure roller or oil
roller dirty?
Is the high-voltage transformer output
defective?
Is each joint of high-voltage output
loosened? (Check if any electric leakage
is causing noise.)
Is there deep scratch on the drum
surface?
Are there fine scratches on the drum
surface (drum pitting)?
Is the drum grounded?
Is the 2nd transfer roller rotating
normally?
Is there foreign matter on the carriage
rail?
Measures
Clean or replace the charger wire.
Clean them.
Check the circuit and replace the high-
voltage transformer if not working.
Reconnect each joint.
Replace the drum, especially if the
scratch has reached the aluminum
base.
Check and correct the contact of
cleaning blade and recovery blade.
Check the contact of the grounding
plate.
Clean the roller area or replace the
roller.
Remove foreign matter.
Fig. 5-216