Toshiba e-STUDIO5540C Service Manual page 316

8.5.16 Color banding (at right angles to feeding direction)
Cause/Section Step
Laser optical 1 Perform the enforced performing of
unit, Main image quality closed-loop control (05-
charger grid 2742).
Main charger 2 Is the needle electrode dirty or
deformed?
Fuser unit 3 Is the fuser belt or pressure roller
dirty?
High-voltage 4 Is the high-voltage transformer output
transformer defective?
(main charger
needle
5 Is each joint of high-voltage output
electrode/grid
loosened? (Check if any electric
and transfer
leakage is causing noise.)
roller bias)
Drum 6 Is there deep scratch on the drum
surface?
7 Are there fine scratches on the drum
surface (drum pitting)?
8 Is the drum grounded?
2nd transfer 9 Is the 2nd transfer roller rotating
roller normally?
Scanner 10 Is there foreign matter on the carriage
rail?
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Fig.8-23
Check item
8 - 315
Measures
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.
Clean or replace the needle
electrode.
Clean them.
Check the circuit and replace the
high-voltage transformer if not
working.
Reconnect each joint.
Replace the drum, especially if the
scratch has reached the aluminum
base.
Check and correct the contact of
cleaning blade and recovery blade.
Check the contact of the grounding
plate.
Clean the roller area or replace the
roller.
Remove foreign matter.
e-STUDIO5540C/6540C/6550C/5560C/6560C/6570C
ERROR CODE and TROUBLESHOOTING
8