Toshiba e-STUDIO350 Service Handbook page 557

13) Black banding (at right angles to feeding direction)
Defective area Step
Main charge wire 1
Fuser unit 2
3
High-voltage trans- 4
former
(Main charger /
Developer bias /
Transfer charger)
Drum 5
6
Scanner 7
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Check items
Is the charger wire dirty or
deformed?
Are the fuser roller, separation finger
and thermistor dirty?
Has the cleaning roller for the pres-
sure roller reached its PM life?
Is the high-voltage transformer out-
put defective?
Is there a deep scratch on the drum
surface?
Is there thin scratch (drum pitting)
on the drum surface?
Is there a foreign matter on the car-
riage rail?
5 - 121
Prescription
Clean or replace the charger wire.
Clean them.
Replace it.
Adjust the output, or replace the trans-
former.
Replace the drum if the scratch has
reached the aluminum base.
Check and adjust the contact condition of
the cleaning blade and recovery blade.
Remove the foreign matter.
e-STUDIO350/352/353/450/452/453
TROUBLESHOOTING
5