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January 2000 © TOSHIBA TEC 4 - 47 FC-22 TROUBLESHOOTING
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CE4 Image quality control test pattern abnormal
(1) Check 08-415 to 418 [Abnormal detection counter Y to K (display/0 clearing)] and check
which color is in error (the value of the color in error is other than 0).
(2) Check 05-819 [Output value indication of image quality sensor/Low density pattern] and
check whether the value of the color in error (the color checked in (1)) is under 300.
Under 300 Transfer belt cleaning defective
300 or
above Check transfer belt and if a cleaning defect is found,
check around the transfer belt cleaning blade to correct it.
Go to (7).
(3) Set 08-401 [Image quality control 2] to [0](disabled).
(4) Specify the color in error (the color checked in (1)) on 04-231 [Gradation check pattern] and
check the output image if there is any error (image lacking, white paper, solid over the whole
page, etc.).
Image error(s) Correct the items related to the image. If OK, go to (6)
No image exists
errors
(5) Sensor fault: Replace image quality sensor.
(6) Change 08-401 [Image quality control 2] back to [1](enabled) if it is [0].
(7) Perform 05-878 [Forced performing of image quality control] to check that it completes
normally (that it does not generate the error [CE4]).
(8) Clear all of 08-415 to 418 [Abnormal detection counter Y to K (display/0 clearing)].
(9) Perform 05-879 [Automatic initialization of image quality control] (only when replacing
specified parts; see Chapter 1.5).