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November 2003 © TOSHIBA TEC 5 - 127 e-STUDIO3511/4511 TROUBLESHOOTING
(18) Uneven image density
Feeding direction
Cause/Section
Main charger
Transfer unit
Laser optical unit
Discharge lamp
Developer unit
Scanner section
Step
1
2
3
4
5
6
7
8
9
10
11
12
Check items
Is the main charger dirty?
Is the transfer belt or 1st/2nd transfer
rollers dirty?
Is the transfer belt in proper contact with
the drum?
Is 2nd transfer roller in proper contact
with the transfer belt?
(Is the roller tilted?)
Is there any abnormalities or deforma-
tion on the transfer belt?
Is there foreign matter or dust on the slit
glass?
Is the discharge lamp dirty?
Has any LED of discharge lamp gone
out?
Is the magnetic brush in proper contact
with the drum?
Is the developer unit pressure mecha-
nism malfunctioning?
Is the transport of developer material
poor?
a.Is the platen cover or RADF open?
b.Is the original glass, mirrors, or lens
dirty?
Measures
Clean it or replace the charger wire.
Clean the belt.
Correct it.
Correct it.
Replace the transfer belt.
Clean the slit glass.
Clean it.
Replace it.
Adjust the doctor-sleeve gap.
Check the mechanism.
Remove foreign matter if any.
a.Close the platen cover or RADF.
b.Clean them.
Fig. 5-219