White Banding (At Right Angles To Feeding Direction) - Toshiba e-STUDIO 5540C Service Manual

8.5.13

White banding (at right angles to feeding direction)

Cause/Section Step
Laser optical 1
unit, Main
charger grid
Main charger 2
3
4
5
Drum 6
7
Discharge LED 8
Developer unit 9
10
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 there foreign matter on the
charger?
Is the terminal contact poor?
Check if the inside wall in the case of
the main charger unit is dirty or there
is any fouling in the case of the main
charger unit.
Check if the main charger grid is
corroded, or rusted, or there is any
fouling on the grid.
Is there any abnormalities on the
drum surface?
Is the drum grounded?
Is the Discharge LED lighting
properly?
Is the developer sleeve rotating
correctly?
Is there any abnormalities on the
sleeve surface?
Is the connection of developer bias
supply terminal normal?
Fig.8-21
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.
Remove foreign matter.
Clean or adjust the terminals.
Clean the inside wall in the case.
Replace the main charger grid.
Replace the drum.
Check the contact of the grounding
plate.
Replace the Discharge LED.
Check the developer drive system, or
clean the sleeve surface.
Correct it.
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Measures