Toshiba e-STUDIO2820C Service Handbook page 361

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<Checking procedure>
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1. Check if +12V voltage is output by the switching power supply (PS-ACC
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2. Check if +12V voltage is output by the CN345-7pin on the LGC board.
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YES
(1) 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).
(2) Perform "Enforced performing of image quality open-loop control (05-394)".
(3) 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.
| Normal
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(4) Replace the image quality sensor or the LGC board.
(5) 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).
(6) Perform "Automatic initialization of image quality control (05-396)" and make sure it is com-
pleted normally. (Error [CE10], [CE20] and [CE40] do not appear.) Then perform "Automatic
gamma adjustment" ( Chapter 3.7.1 and 3.8.1).
Check and correct it accordingly.
(7) Reset all of the values in the codes "Abnormality detection count (Y/M/C/K) Display/0 clearing
(08-573 to 08-576)".
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CN404-7pin).
Check if the supply harness between the switching power supply and the
LGC board is open circuited, damaged or disconnected.
Proceed to step (6). (to step (1) for the second time)
Abnormal
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.
* Blank print: including when one of the YMCK colors is not printed.
Correct the abnormal image.
Proceed to step (5).
| When an error occurs:
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e-STUDIO2820C/2830C/3520C/3530C/4520C
ERROR CODE AND TROUBLESHOOTING
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