Toshiba e-STUDIO5540C Service Manual page 165

Step Check item
6 Output the image quality
control test pattern (04-270)
more than one time and the
list print ([9][START]) in the
adjustment mode (05), and
then check if the image is
normal.
7 Replace the image quality
sensor or the LGC board.
8 Set the values of "Image
quality closed-loop control /
Contrast voltage (08-2486)"
and "Drum surface potential
sensor control setting (08-
2561)" to "1" (Valid).
9 Perform "Image quality
closed-loop control (05-
2742)" and make sure it is
completed normally. (Error
[CE10], [CE20] and [CE40]
do not appear.) Then
perform "Automatic gamma
adjustment".
10 Reset all of the values in the
codes "Abnormality
detection count (Y/M/C/K)
Display/0 clearing (08-2528
to 08-2531)".
Replace parts
Image quality sensor
[CE40] Image quality control test pattern abnormality
Classification
Image control related service call
Step Check item
1 Use "Image quality control
abnormal detection counter
Y to K display/0 clearing (08-
2528 to 2531)" to check the
abnormal occurring
condition for each color.
e-STUDIO5540C/6540C/6550C/5560C/6560C/6570C
ERROR CODE and TROUBLESHOOTING
Result
Normal
Abnorm Abnormal image:
al Blank print, Solid print, White banding,
Color banding, White spots, Poor transfer,
Uneven image density, Faded image (low
density), Uneven light distribution, Blotched
image.
Blank print: including when one of the
YMCK colors is not printed.
Correct the abnormal image.
Proceed to step (8).
NO
When Check and correct it accordingly.
an error
occurs
The test pattern is not formed normally.
Result
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