Toshiba e-STUDIO556 Service Manual page 781

NO
Is there any stain or dent on the surface of the photoconductive drum?
YES 
l
l
l
l
l
l
l
l
l
l
l

NO
Is the image quality sensor wrongly installed to the cleaner?
YES 
l
l

NO
Is the surface of the image quality sensor stained?
YES 
l
l

NO
Are any of the following disconnected: the connector of the image quality sensor, the
connector CN337 and CN342 of the LGC board, the connector CN134 and CN130 and
CN104 of the SYS board?
YES 
l

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?
YES 
l

NO
Is the power voltage for the 12V power normal?
NO 
l
l

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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
quality 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).
Check the power system, replace the switching power supply, and then
perform the image quality control enforcement / condition check (image
check; described later).
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e-STUDIO556/656/756/856/557/657/757/857
ERROR CODE AND TROUBLESHOOTING
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