Toshiba e-STUDIO5540C Service Manual page 314

8.5.15 Color banding (in feeding direction)
Cause/Section Step
Laser optical 1 Perform the enforced performing of
unit, Main image quality closed-loop control (05-
charger grid 2742).
Scanner 2 Is there foreign matter in the optical
path?
3 Is there dust or stain on the shading
correction plate or ADF original
glass?
Main charger 4 Is there foreign matter on the charger
grid?
5 Is the charger grid dirty or deformed? Clean or replace the charger grid.
6 Is there foreign matter on the main
charger?
7 Is the needle electrode dirty or
deformed?
8 Is the needle electrode cleaner dirty
or deformed?
9 Is the inner surface of charger case
dirty?
Drum cleaner 10 Is there any foreign matter on the
drum cleaning blade edge?
11 Is toner recovery defective?
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Fig.8-22
Check item
8 - 313
Measures
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.
Clean the slit, lens and mirrors.
Clean it.
Remove foreign matter.
Remove foreign matter.
Clean or replace the needle
electrode.
Clean or replace the needle electrode
cleaner.
Clean inside.
Clean or replace the drum cleaning
blade.
Clean the toner recovery auger
section.
e-STUDIO5540C/6540C/6550C/5560C/6560C/6570C
ERROR CODE and TROUBLESHOOTING
8