Toshiba e-STUDIO5540C Service Manual page 321

8.5.19 Uneven image density 1
Cause/Section Step
Laser optical 1
unit, Main
charger grid
Main charger 2
Transfer unit 3
4
5
6
Laser optical 7
unit
Discharge LED 8
9
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 main charger dirty?
Is the transfer belt in proper contact
with the drum?
Is the transfer belt or 1st/2nd transfer
rollers dirty?
Is 2nd transfer roller in proper contact
with the transfer belt? (Is the roller
tilted?)
Is there any abnormalities or
deformation on the transfer belt?
Is there foreign matter or dust on the
slit glass?
Is the Discharge LED dirty?
Has any LED of Discharge LED gone
out?
Fig.8-26
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 it or replace the needle
electrode.
Check if the transfer belt is installed
properly.
Check if the TBU lock lever is in the
release position.
Clean the belt.
Correct it.
Replace the transfer belt.
Clean the slit glass.
Clean it.
Replace it.
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Measures