Toshiba e-STUDIO 2555C Service Manual page 748

Step Check Item
Image quality sensor
9
• Is +5V power supply voltage
normally supplied to the image
quality sensor?
10
• Is +5V voltage normally output
by the CN345-7pin on the LGC
board?
Switching power supply
11
LGC board
12
Set the values of "Image quality
closed-loop control / Contrast
13
voltage (08-2486)" to "0" (Invalid).
Perform "Enforced performing of
image quality open-loop control
14
(05-2740)".
Output the image quality control
test pattern (04-270) more than
15
one time and the list print
([9][START]). Is the image normal?
Abnormal image
Correct the abnormal image.
16
Replace the image quality sensor
17
or the LGC board.
Set the values of "Image quality
closed-loop control / Contrast
18
voltage (08-2486)" to "1" (Valid).
Perform "Forced performing of
image quality closed-loop control
(05-2742)" and make sure it is
19
completed normally. (Error [CE10],
[CE20] and [CE40] do not appear.)
Check and correct it accordingly.
20
Perform "Automatic gamma
21
adjustment".
e-STUDIO2555C/3055C/3555C/4555C/5055C
ERROR CODE AND TROUBLESHOOTING
Result Measure
Check the connectors and harnesses
between the LGC board (CN366) and
the image quality sensor.
Yes
No
Check if +5V voltage is output by the
switching power supply (PS-ACC
CN404-7pin).
• Check if +5V voltage is output by
the C33 + terminal on the LGC
board.
• Check if the supply harness
between the switching power
supply and the LGC board is open
circuited, damaged or
disconnected.
Yes
No
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.
Yes
No
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