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June 2005 © TOSHIBA TEC e-STUDIO281c/351c/451c TROUBLESHOOTING
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(3) Check “Output value display of image quality sensor / High-density pattern (05-390-0 to 3)” to
check if the high-density pattern abnormality occurs for each color and identify the color which
pattern is abnormal. If the value is 630 or above, it is defined as high-density pattern abnormality.
(4) Set the values of “Image quality closed-loop control / Contrast voltage (08-556)” and “Image
quality closed-loop control / Laser power (08-557)” to “0” (Invalid).
(5) Perform “Enforced performing of image quality open-loop control (05-394)”.
(6) Output the image quality control test pattern (04-270) more than one time and check the patch of
the color identified in step (3) to see if the image is abnormal (Note).
(7) Replace the image quality sensor.
(8) Set the values of “Image quality closed-loop control / Contrast voltage (08-556)” and “Image
quality closed-loop control / Laser power (08-557)” to “1” (Valid).
(9) Perform “Enforced performing of image quality open-loop control (05-394)” and make sure it is
completed normally. (Error [CE40] does not appear.) Then perform “Automatic gamma adjust-
ment“ ( Chapter 3.5.1 and 3.6.1).
(10) Clear all "Image quality control abnormal detection counter Y to K display/0 clearing (08-573 to
576)".
Note: Note:
Abnormal image:
Blank print, Solid print, White banding, Color banding, White spots, Poor transfer, Uneven image
density, Faded image (low density), Uneven light distribution, Blotched image.
[CE50] Temperature/humidity sensor abnormality
[CE90] Drum thermistor abnormality
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Normal
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Abnormal
Correct the items related to the image.
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To (9)
Is the connector CN333 on the LGC board or the connector of the temperature/humidity sen-
sor disconnected?
Is the harness between the LGC board and the temperature/humidity sensor disconnected ?
È
YESÆ Connect the connector securely. Replace the harness.
NO
1) Replace the temperature/humidity sensor.
2) Replace the LGC board.
Is the connector CN333 on the LGC board, or the connector of the drum thermistor discon-
nected?
Is the harness between the LGC board and the drum thermistor disconnected?
È
YESÆ Connect the connector securely. Replace the harness.
NO
1) Replace the drum thermistor.
2) Replace the LGC board.