Toshiba e-STUDIO556 Service Manual page 720

YES
Is the value for the image quality sensor output value (Light source off) 05-2134 outside the
range between 50 and 230?
Is the value for the image quality sensor light amount adjustment result 05-2138 "0 "or
"255"?
Is the value for the image quality sensor light amount adjustment result 05-2138 other than
"0 "or "255"?
Is the power voltage output (Vout2) that is created in the sensor outside the range?
l YES
l
l
l
l
l
l
l
l
NO
Replace the LGC board, and perform the image quality control enforcement / condition
check (image check; described later).
<<Procedure of the "enforced performing of image quality control"/"control status check">>
Set the value for the number of times of sensor abnormality (08-2873) to "0".
Set the value for the Image quality closed-loop control (08-2844-0), (08-2844-1) to "0"
(valid).
Perform the "enforced performing of image quality control" (05-2120).
Check the control status of the image quality control (05-2133) and number of times of
sensor abnormality (08-2873).
Are both values for 05-2133 and 08-2873 "0"?
Perform the test print (04-114: 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 05-2133 "1"?
Attempt the procedure again from the beginning.
• Is the value for 05-2133 "2"?
Pattern abnormality. Go back to "(1) Pattern abnormality " and clear the problem.
• Is the value for 05-2133 "4"?
Sensor abnormality. Go back to "(2) Sensor abnormality" and clear the problem.
* When the value for 05-2160 (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.
e-STUDIO556/656/756/856(Ver03)
ERROR CODE AND TROUBLESHOOTING
1. Is toner adhered to the connector that connects the cleaner unit and
this equipment and the connector almost short-circuited or
disconnected? Replace the harness if needed, and then perform the
image quality control enforcement / condition check (image check;
described later).
2. Replace the LGC board, and perform the image quality control
enforcement / condition check (image check; described later).
3. Replace the image quality sensor, and perform the image quality
control enforcement / condition check (image check; described later).
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