White Spots - Toshiba e-STUDIO 5540C Service Manual

8.5.17

White spots

Cause/Section Step
Laser optical 1
unit, Main
charger grid
Developer unit/ 2
Toner cartridge
3
Developer 4
material/Toner/
Drum
5
6
7
8
9
Transfer unit 10
11
e-STUDIO5540C/6540C/6550C/5560C/6560C/6570C
ERROR CODE and TROUBLESHOOTING
Check item
Perform the enforced performing of
image quality closed-loop control (05-
2742).
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 35oC or less without
dew?
Is there any dent on the surface of the
drum?
Is there any film forming on the drum? Clean or replace the drum.
Is the drum bedewed?
Is there any foreign matter or oil on
the transfer belt surface?
Is there foreign matter on the transfer
belt or 2nd transfer facing roller?
Fig.8-25
When the enforced performing of
image quality closed-loop control is
performed, the automatic cleaning of
main charger and the LSU slit glass
cleaning are performed at the same
time.
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.
Wipe the drum surface with a piece of
dry cloth.
Remove foreign matter.
If there is any oil, clean it off with
alcohol.
Clean the 2nd transfer facing roller
and the transfer belt.
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Measures