Toshiba e-STUDIO 2555C Service Manual page 746

Step Check Item
<Checking the power supply>
31
[CE10] Image quality sensor abnormality (OFF level)
Classification
Image control related service call
Check Item
Image quality sensor
LGC board
Replacement part
Switching power supply
Image quality sensor
LGC board
[CE20] Image quality sensor abnormality
Classification
Image control related service call
Step Check Item
• Check the image quality sensor
detection value (05-2757).
• Is the value of 05-2757-0 "0",
1
and is the value of 05-2757-1
"255"?
• Is the transfer belt or the
transfer belt unit securely
installed?
• Are there any abnormal stains
(cleaning defects), large
scratches or breaking on the
2
transfer belt surface?
• Are the drum and the transfer
belt rotating smoothly?
• Is the transfer belt tight?
e-STUDIO2555C/3055C/3555C/4555C/5055C
ERROR CODE AND TROUBLESHOOTING
Result
Check if any of the springs for
supplying power to the transfer belt
unit is deformed. Replace the spring if
it is deformed.
Image quality sensor abnormality (OFF level): The output value
of this sensor is out of a specified range when sensor light
source is OFF.
Connector check
• Connector check (CN366)
• Check the harnesses between the LGC board and the
image quality sensor.
• Check the harnesses between the LGC board and the
switching power supply.
Image quality sensor abnormality (no pattern level): The output
value of this sensor is out of a specified range when the image
quality control test pattern is not formed.
Result
Yes
No
Yes
No
© 2012-2013 TOSHIBA TEC CORPORATION All rights reserved
8 - 190
Measure
Contents
Measure
Measure
Contents
Measure
Next
Step
Next
Step
9
2
6
3