Toshiba e-STUDIO520 Service Handbook page 500

10)White banding (at right angle with the feeding direction)
Defective area
Main charger
Drum
Discharge LED
Developer unit
Drive system
High-voltage transformer
(Main charger / Developer
bias / Transfer charger)
Feed system
e-STUDIO520/523/600/603/720/723/850/853
TROUBLESHOOTING
Fig. 5-10
Step Check items
1 Is there a foreign matter on the
charger?
2 Is the connector in proper contact
with the terminal?
3 Is there any abnormality on the drum
surface?
4 Does the discharge LED light nor-
mally?
5 Is the developer sleeve rotating nor-
mally?
Is there any abnormality on the
sleeve surface?
6 Are the drum and scanner jittering?
7 Is the high-voltage transformer out-
put defective?
9 Is the aligning amount proper?
5 - 138
Prescription
Remove the foreign matter.
Clean or adjust the terminal.
Replace the drum.
Replace the discharge LED or check
the harness and the circuit.
Check the drive system of the devel-
oper unit, or clean the sleeve sur-
face.
Check each drive system.
Replace the transformer.
Adjust the aligning amount.
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