Toshiba e-STUDIO165 Service Manual page 259

14)White spots
Defective area
Developer unit,
Toner cartridge
Developer material, Toner,
Drum
Main charger
High-voltage transformer
(Main charger / Developer
bias / Transfer charger)
Transfer/Separation
charger
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Fig. 5-14
Step Check items
1 Is the toner density in the developer
material appropriate?
2 Is the doctor-sleeve gap proper?
3 Using the specified developer mate-
rial, toner and drum?
4 Have the developer material and
drum reached their PM life?
5 Is the storage environment of the
toner cartridge 35°C or less without
dew?
6 Is there any dent on the drum sur-
face?
7 Is there any film forming on the
drum?
8 Is there any foreign matter on the
charger?
9 Is the needle electrode dirty or
deformed?
10 Is the high-voltage transformer out-
put defective?
11 Is there any foreign matter such as
fiber in the paper transport area of
the transfer/separation charger?
5 - 41
Prescription
Check and correct the auto-toner
sensor and toner supply operation.
Check if the amount of the toner is
sufficient in the toner cartridge.
Adjust the doctor-sleeve gap.
Use the specified developer material,
toner and drum.
Replace the developer material and
drum.
Use the toner cartridge stored in the
environment with specification.
Replace the drum.
Clean or replace the drum.
Remove it.
Clean or replace the needle elec-
trode.
Adjust the output, or replace the
transformer.
Clean the transfer/separation
charger.
e-STUDIO165/167/205/207/237
TROUBLESHOOTING
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