Toshiba e-STUDIO520 Service Handbook page 483

(2) Sensor abnormality
Perform the test print. (04-113: Secondary scanning direction 33 gradation steps)
Is solid black image is printed?
l YES
l
l
NO
Is there any stain or dent on the surface of the photoconductive drum?
l YES
l
l
l
l
l
l
l
l
l
l
NO
Is the image quality sensor wrongly installed to the cleaner?
l YES
l
NO
Is the surface of the image quality sensor stained?
l YES
l
NO
Is the connector of the image quality sensor, connector of the LGC board CN337, CN342 or
connector of the SYS board CN103 disconnected?
l YES
NO
Is the harness between the LGC board and the image quality sensor, the LGC board and
the SYS board or LGC board and the switching power supply open-circuited?
l YES
NO
Is the power voltage for the 12V power normal?
© 2005 - 2007 TOSHIBA TEC CORPORATION All rights reserved
Clear the problem so that the correct image is printed. See " Trouble-
shooting for the Image" for details. When the correct image is able to be
output, perform the image quality control enforcement / condition check
(image check; described later).
1) Is there any stain on the surface of the photoconductive drum facing
the surface of the image quality sensor? If there is, check that the
cleaning blade of the cleaner unit is installed properly. If the cleaning
blade is damaged, replace it, and then perform the image quality
control enforcement / condition check (image check; described later).
2) Check that there is no dent on the surface of the photoconductive
drum facing the surface of the image quality sensor. If there is,
replace the photoconductive drum, and then perform the image qual-
ity control enforcement / condition check (image check; described
later).
Install the image quality sensor to the cleaner unit properly, and perform
the image quality control enforcement / condition check (image check;
described later).
Clean the surface of the image quality sensor. Replace it if necessary,
and then perform the image quality control enforcement / condition
check (image check; described later).
Plug the connector again, and then perform the image quality control
enforcement / condition check (image check; described later).
Replace the open-circuited harness, and then perform the image quality
control enforcement / condition check (image check; described later).
5 - 121
e-STUDIO520/523/600/603/720/723/850/853
TROUBLESHOOTING
5