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FC-210/310 TROUBLESHOOTING 4 - 56 February 2002 © TOSHIBA TEC
[CE4] Image quality control test pattern abnormal
(1) Use "Image quality control abnormal detection counter Y~K display/0 clearing (08-415~418)"
to check the abnormal occurring condition for each color.
(2) Check "Output value display of image quality sensor/Low-density pattern (05-819)" to confirm
if the value is under 300 (low-density pattern abnormal) for each color.
under 300
Poor cleaning of the transfer belt
Check the transfer belt. If the cleaning is poor, correct
300 or above the transfer belt around its cleaning balde.
To (8)
(3) Check "Output value display of image quality sensor/High-density pattern (05-820)" to confirm
if the value is 600 or above (high-density pattern abnormal) and identify the color which
pattern is abnormal.
(4) Set the values of "Image quality control 2(08-401)", "Image quality control 5(08-402)" and
"Image quality control 4(08-411)" to "0" (disabled).
(5) Output the image quality control test pattern (04-270) and check the patch of the color
identified in step (3) to see if the image is abnormal (image omitted, all blank, all solid, etc.).
Normal Abnormal
Correct the items related to the image.
To (8)
(6) Replace the image quality sensor.
(7) Set the values of "Image quality control 2 (08-401)", "Image quality control 5 (08-402)" and
"Image quality control 4 (08-411)" to "1" (enabled).
(8) Perform "Forced performing of image quality control (05-878)" and make sure it is completed
normally (Error [CE4] does not appear).
(9) Clear all "Image quality control abnormal detection counter Y~K display/0 clearing (08-
415~418)".
(10)If any of the specified parts has been replaced, perform "Automatic initialization of image
quality control (05-879)" ( Chapter 2.3) and then perform "Automatic gamma adjustment
(05-643)" ( Chapter 2.6.1).