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