Toshiba e-STUDIO5540C Service Manual page 309

8.5.12 White banding or white void (in feeding direction)
Cause/Section Step
Scanner 1
Laser optical 2
unit, Main
charger grid
Laser optical 3
unit
Developer unit 4
e-STUDIO5540C/6540C/6550C/5560C/6560C/6570C
ERROR CODE and TROUBLESHOOTING
Fig.8-19
Check item
Is there foreign matter or dust in the
optical path?
Perform the enforced performing of
image quality closed-loop control (05-
2742).
Is there foreign matter or dust on the
slit glass?
Is there foreign matter inside the
developer unit or on the developer
sleeve?
Clean the lens and mirrors.
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 any dirt or foreign matters.
(The slit glass can be cleaned even
when the process unit is taken off.)
Check if there is a white streak in the
developer material on the developer
sleeve. Scrape off foreign matter
around the white streak using a jig.If
there is no white streak, put the sheet
of paper with a white banding to the
developer sleeve, and scrape off the
developer material around the white
band to see if there is foreign matter
in it. Scrape off foreign matter and
developer material on the developer
sleeve.
 P. 7-26"7.6.7 Developer unit (K, Y,
M, and C)"
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Measures