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November 2003 © TOSHIBA TEC 5 - 119 e-STUDIO3511/4511 TROUBLESHOOTING
(11) White banding (in feeding direction)
Feeding direction
Cause/Section
Laser optical unit
Main charger grid
Developer unit
Drum
Transfer unit
Transport path
Discharge lamp
Scanner
Step
1
2
3
4
5
6
7
8
9
10
11
12
13
14
Check items
Is there foreign matter or dust on the slit
glass?
Is there foreign matter on the charger
grid?
Is there foreign matter inside the doctor
blade?
Is there foreign matter on the drum
seal?
Is the drum seal of developer unit in
proper contact with the drum?
Is there scratch or foreign matter on the
drum surface?
Is there scratch or foreign matter on the
transfer belt surface?
Are the harness or foreign matters in
contact with the transfer belt surface?
Is the transfer belt cleaning blade
contacted and released properly?
Is the transfer belt cleaning blade in
proper contact with the transfer belt?
Is there any scratch or hole on the 1st/
2nd transfer roller?
Does the toner image touch foreign
matter after transfer, before entering the
fuser unit?
Has any LED of discharge lamp gone
out?
Is there foreign matter or dust in the
optical path?
Measures
Clean the slit glass.
Remove foreign matter.
Remove foreign matter.
Remove foreign matter.
Modify the position of drum seal or
replace it.
Replace the drum.
Replace the transfer belt.
Correct or remove them.
Check if the spring of the transfer belt
cleaner clutch is removed or if any
connector is disconnected. Otherwise
replace the clutch.
Check if the blade pressure spring is
installed.
Replace the 1st/2nd transfer roller.
Remove foreign matter.
Replace the discharge lamp.
Clean the lens and mirrors.
Fig. 5-212