March 2005 © TOSHIBA TEC e-STUDIO520/600/720/850 TROUBLESHOOTING
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(The following procedure is for the normal image printing. See " Troubleshooting for the
Image".)
Is the developer unit inserted securely and locked properly?
l
l
!
NO " Insert the developer unit securely until it locks. When the normal image
is able to be output, perform the image quality control enforcement /
condition check (image check; described later).
YES
Is developer material in the developer remarkably low or any foreign matter in the devel-
oper?
l
l
!
YES " Replace the developer material and the developer unit if needed. When
the normal images is able to be output, perform the image quality control
enforcement / condition check (image check; described later).
NO
Is the main charger wrongly installed or the main charger grid stained?
l
l
l
!
YES " Install the main charger properly. Clean the main charger grid. If the
main charger grid is damaged, replace it. When the normal image is
able to be output, perform image quality control enforcement / condition
check (image check; described later).
NO
Is there any stain or dent on the surface of the photoconductive drum?
l
l
l
!
YES " Clean the photoconductive drum or replace it. Replace the cleaner unit
and developer unit if needed. When the normal image is able to be out-
put, perform the image quality control enforcement / condition check
(image check; described later).
NO
Replace the LGC board, and perform the image quality control enforcement / condition
check (image check; described later).
Replace the laser unit, and perform the image quality control enforcement / condition check
(image check; described later).
Replace the HVT board, and perform the image quality control enforcement / condition
check (image check; described later).
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