e-STUDIO5540C/6540C/6550C/5560C/6560C/6570C © 2011 - 2015 TOSHIBA TEC CORPORATION All rights reserved
ERROR CODE and TROUBLESHOOTING
8 - 324
8.5.19 Uneven image density 1
Fig.8-27
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.
Main charger 2 Is the main charger dirty? Clean it or replace the needle
electrode.
Transfer unit 3 Is the transfer belt in proper contact
with the drum?
Check if the transfer belt is installed
properly.
Check if the TBU lock lever is in the
release position.
4 Is the transfer belt or 1st/2nd transfer
rollers dirty?
Clean the belt.
5 Is 2nd transfer roller in proper contact
with the transfer belt? (Is the roller
tilted?)
Correct it.
6 Is there any abnormalities or
deformation on the transfer belt?
Replace the transfer belt.
Laser optical
unit
7 Is there foreign matter or dust on the
slit glass?
Clean the slit glass.
Discharge LED 8 Is the Discharge LED dirty? Clean it.
9 Has any LED of Discharge LED gone
out?
Replace it.
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