Toshiba E-STUDIO520, Service Manual, Page: 462 / 592

e-STUDIO520/600/720/850 TROUBLESHOOTING March 2005 © TOSHIBA TEC
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9) White banding (in the feeding direction)
Fig.5-9
Defective area Step Check items Prescription
Laser optical unit 1 Is there a foreign matter or stain on
the slit glass? Remove the foreign matter or stain.
Main charger grid 2 Is there a foreign matter or dew on
the charger grid? Remove the foreign matter.
Developer unit 3 Is the developer material transported
properly? Remove the foreign matter if there is
any.
4 Is there a foreign matter or dew on
the Polyurethane seal? Remove the foreign matter or dew.
5 Is the upper Polyurethane seal of the
developer unit in contact with the
drum? Correct the position of the Polyure-
thane seal or replace it.
Drum 6 Is there a foreign matter on the drum
surface? Replace the drum.
Transport path 7 Does the toner image contact with
any foreign matter before the paper
enters the fusing section after the
separation? Remove the foreign matter.
Discharge LED 8 Is any of the discharge LEDS off? Replace the discharge LED.
Scanner 9 Is there a foreign matter on the light
path? Remove the foreign matter.
10 Are the original glass (especially the
position of shading correction plate)
mirror and lens dirty? Clean them.
Cleaner 11 Is there any foreign matter, which
contacts the drum on the cleaner
stay? Remove the foreign matter.
Feeding direction