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November 2003 © TOSHIBA TEC 5 - 125 e-STUDIO3511/4511 TROUBLESHOOTING
(16) White spots
Feeding direction
Cause/Section
Developer unit/Toner
cartridge
Developer material/
Toner/Drum
Transfer unit
Main charger
High-voltage
transformer
(main charger wire/
grid, developer 1st/
2nd transfer roller
bias)
Paper
Step
1
2
3
4
5
6
7
8
9
10
11
12
13
14
Check items
Is the toner density of developer material
proper?
Is the doctor-sleeve gap proper?
Using the specified developer material,
toner and drum?
Have the developer material and drum
reached their PM life?
Is the storage environment of the toner
cartridge 35
o
C or less without dew?
Is there any dent on the surface of the
drum?
Is there any film forming on the drum?
Is the drum bedewed?
Is there foreign matter on the transfer
belt surface?
Is there foreign matter on the transfer
belt drive roller?
Is there foreign matter on the charger?
Is the charger wire dirty or deformed?
Is the high-voltage transformer output
defective?
Is the paper type corresponding to its
mode?
Measures
Check and correct the auto-toner sensor
and toner supply operation.
Check if the amount of toner is sufficient
in the toner cartridge.
Adjust the gap.
Use the specified developer material,
toner and drum.
Replace the developer material and
drum.
Use the toner cartridge stored in the
environment within specification.
Replace the drum.
Clean or replace the drum.
Wipe the drum surface with a piece of
dry cloth.
Remove foreign matter.
Clean the transfer belt unit.
Remove it.
Clean or replace the charger wire.
Adjust the output.
Use the proper type of paper or select
the proper mode.
Fig. 5-217