e-STUDIO5540C/6540C/6550C/5560C/6560C/6570C © 2011 - 2015 TOSHIBA TEC CORPORATION All rights reserved
ERROR CODE and TROUBLESHOOTING
8 - 320
8.5.17 White spots
Fig.8-25
Cause/Section Step Check item Measures
Laser optical
unit, Main
charger grid
1 Perform the enforced performing of
image quality closed-loop control (05-
2742).
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.
Developer unit/
Toner cartridge
2 Is the toner density of developer
material proper?
Check and correct the auto-toner
sensor and toner supply operation.
Check if the amount of toner is
sufficient in the toner cartridge.
3 Is the doctor-sleeve gap proper? Adjust the gap.
Developer
material/Toner/
Drum
4 Using the specified developer
material, toner and drum?
Use the specified developer material,
toner and drum.
5 Have the developer material and
drum reached their PM life?
Replace the developer material and
drum.
6 Is the storage environment of the
toner cartridge 35oC or less without
dew?
Use the toner cartridge stored in the
environment within specification.
7 Is there any dent on the surface of the
drum?
Replace the drum.
8 Is there any film forming on the drum? Clean or replace the drum.
9 Is the drum bedewed? Wipe the drum surface with a piece of
dry cloth.
Transfer unit 10 Is there any foreign matter or oil on
the transfer belt surface?
Remove foreign matter.
If there is any oil, clean it off with
alcohol.
11 Is there foreign matter on the transfer
belt or 2nd transfer facing roller?
Clean the 2nd transfer facing roller
and the transfer belt.
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