Toshiba e-STUDIO350 Service Handbook page 558

14) White spots
Defective area Step
Developer unit / 1
Toner cartridge
2
Developer material/ 3
Toner/ Drum
4
5
6
7
Main charger 8
9
High-voltage trans- 10
former (Main
charger / Developer
bias / Transfer
charger)
Transfer/Separa- 11
tion charger
e-STUDIO350/352/353/450/452/453
TROUBLESHOOTING
Check items
Is the toner density in the developer
material appropriate?
Is the doctor-sleeve gap proper?
Using the specified developer mate-
rial, toner and drum?
Have the developer material and
drum reached their PM life?
Is the storage environment of the
toner cartridge 35°c or less without
dew?
Is there any dent on the drum sur-
face?
Is there any film forming on the
drum?
Is there any foreign matter on the
charger?
Is the charger wire dirty or
deformed?
Is the high-voltage transformer out-
put defective?
Is there any foreign matter such as
fiber in the paper transport area of
the transfer/separation charger?
5 - 122
Prescription
Check and correct the auto-toner sensor
and toner supply operation.
Check if the amount of the toner is suffi-
cient in the toner cartridge.
Adjust it.
Use the specified developer material, toner
and drum.
Replace the developer material and drum.
Use the toner cartridge stored in the envi-
ronment with specification.
Replace the drum.
Clean or replace the drum.
Remove it.
Clean or replace the charger wire.
Adjust the output, or replace the trans-
former.
Clean the charger.
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