White Spots - Toshiba e-STUDIO205L Service Handbook

6.4.14

White spots

Defective area
Developer unit,
Toner cartridge
Developer material, Toner,
Drum
Main charger
High-voltage transformer
(Main charger / Developer
bias / Transfer roller unit)
Transfer roller unit
e-STUDIO205L/255/305/355/455
ERROR CODE AND TROUBLESHOOTING
Fig. 6-15
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
material, 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
surface?
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
output defective?
11 Is there any foreign matter such as
fiber in the paper transport area of
the transfer roller unit?
12 Is there any foreign matter on the
transfer roller? Is there any
abnormality on its appearance?
6 - 134
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
electrode.
Adjust the output, or replace the
transformer.
Clean the transfer roller unit.
Remove the foreign matter or replace
the transfer roller.
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