Toshiba e-STUDIO520 Service Handbook page 485

<<Procedure of the "enforced performing of image quality control"/"control status check">>
Set the value for the number of times of sensor abnormality (08-800) to "0".
Set the value for the Image quality closed-loop control (08-1809), (08-1810) to "0" (valid).
Perform the "enforced performing of image quality control" (05-290).
Check the control status of the image quality control (05-291) and number of times of sen-
sor abnormality (08-800).
Are both values for 05-291 and 08-800 "0"?
Perform the test print (04-113: Secondary scanning direction 33 gradation steps). Is the
image printed properly?
YES
NO
See " Troubleshooting for the Image" and clear the problem.
• Is the value for 05-291 "1"?
Attempt the procedure again from the beginning.
• Is the value for 05-291 "2"?
Pattern abnormality. Go back to "(1) Pattern abnormality " and clear the problem.
• Is the value for 05-291 "4"?
Sensor abnormality. Go back to "(2) Sensor abnormality" and clear the problem.
* When the value for 05-242 (Drum surface potential sensor control status) is other than
"0", there is a problem on the drum surface potential control. Clear the problem with the
troubleshooting for surface potential control related.
© 2005 - 2007 TOSHIBA TEC CORPORATION All rights reserved
END
5 - 123
e-STUDIO520/523/600/603/720/723/850/853
TROUBLESHOOTING
5