Toshiba e-studio600 Service Manual page 450

Check the value for 05-268 and 05-269. Is the value which is subtracted the value for 05-
268 from the one for 05-269 "400" or more?
NO Æ
l
l
l
l
l
l
l
l
l
È
YES
Replace the LGC board and perform the drum surface potential sensor control / condition
check (described later).
<<Procedure of the "surface potential sensor control check">>
1) Set the value for the number of detected abnormalities of the drum surface potential
control (08-1812) to "0".
2) Set the value for the drum surface potential setting (08-1813) to "0" (valid).
3) Perform the "enforced performing of image quality control" (05-290).
4) Check the status of drum surface potential sensor control (05-242) and number of drum
surface potential sensor control abnormality (08-1812).
Are both values for 05-242 and 08-1812 "0"?
Perform the test print (04-113: Secondary scanning direction 33 gradation steps). Is there
any problem with the image?
YES Æ
È
NO
See " Troubleshooting for the Image" to clear the problem.
• Is the value for 05-242 "1"?
Repeat the procedure from the beginning.
• Is the value for 05-242 "2"?
Drum surface potential sensor control abnormality. Go back to "Troubleshooting for sur-
face potential control related" and clear the problem.
* When 05-291 (Status of image quality control) is other than "0", there is a problem with
the image quality control. Clear the problem with the trouble shooting for the image qual-
ity control related.
e-STUDIO520/600/720/850 TROUBLESHOOTING
1) Replace the HVT board, and perform the drum surface potential sen-
sor control / condition check (described later).
2) Replace the photoconductive drum, and perform the drum surface
potential sensor control / condition check (described later).
3) Replace the surface potential sensor, and perform the drum surface
potential sensor control / condition check (described later).
4) If the problem still occurs, replace the LGC board, and perform the
drum surface potential sensor control / condition check (described
later).
End
5 - 122
March 2005 © TOSHIBA TEC