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e-STUDIO281c/351c/451c TROUBLESHOOTING June 2005 © TOSHIBA TEC
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[CE20] Image quality sensor abnormality (no pattern level)
1) Check if the transfer belt or transfer belt unit are securely installed.
2) Check for any abnormal stain caused by poor cleaning, large flaw or break on the transfer belt sur-
face.
3) Check if the drum and the transfer belt are rotating. If any abnormality is found, correct any mechan-
ical problem.
[CE40] Image quality control test pattern abnormality
(1) Use "Image quality control abnormal detection counter Y to K display/0 clearing (08-573 to 576)"
to check the abnormal occurring condition for each color.
(2) Check “Output value display of image quality sensor / Low-density pattern (05-391-0 to 3)” to
check if the low-density pattern abnormality occurs for each color. The values under 320 for Y, M
and C, and under 220 for K are defined as low-density pattern abnormality.
Is the connectors CN338 on the LGC board disconnected?
Is the connector of the image quality sensor disconnected or the surface of the sensor
stained?
Is the harness between the LGC board and the image quality sensor open circuited?
Is the shutter of image quality sensor opening and closing normally?
Is the shutter damaged?
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YESÆ <Procedure>
1) Take off the transfer belt unit so that the image quality sensor unit can be
easily seen.
2) While pressing the digital keys [0] and [3] simultaneously, turn the power
ON.
3) Key in “430”.
4) The shutter is opened and closed repeatedly by pressing the [START] but-
ton repeatedly.
Connect the connector securely. Replace the harness. Clean the sensor.
Replace the shutter if it is damaged.
Replace the shutter solenoid if its operation is defective.
NO
Is the output voltage from the 12V-power supply normal?
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NO Æ Check the power supply system, and replace the switching power supply.
YES
1) Replace the image quality sensor.
2) Replace the LGC board.
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320 or above (Y, M and C)
220 or above (K)
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Under 320 (Y, M and C)
Under 220 (K)
Low-density pattern abnormality
Check the transfer belt. If the cleaning is poor, correct the
transfer belt around its cleaning blade.
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