Toshiba e-STUDIO 5540C Service Manual page 920

[CE10] Image quality sensor abnormality (OFF level)
Classification
Image control related service call
Check item
Image quality sensor (S23)
LGC board
Switching regulator
Replace parts
Image quality sensor
Switching regulator
LGC board
[CE20] Image quality sensor abnormality (no pattern level)
Classification
Image control related service call
Step Check item
1 Is the transfer belt or the
transfer belt unit securely
installed?
Are there any abnormal
stains (cleaning defects),
large scratches or breaking
on the transfer belt surface?
Are the drum and the
transfer belt rotating?
e-STUDIO5540C/6540C/6550C/5560C/6560C/6570C
ERROR CODE and TROUBLESHOOTING
The output value of this sensor is out of a specified range
when sensor light source is OFF.
• Sensor check
• Connector check
• Harness check
• Connector check (CN307)
• 12V check (CN301-9pin)
• Harness check
• 12V check
• Harness check
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 <Checking procedure>
1. Check if the transfer belt unit is securely
installed. Correct it if not.
2. Check if any toner image remains on the
transfer belt surface.
If any, check the installation status of the
TBU cleaner unit. If there is any
abnormality, correct it, and clean the
transfer belt.
3. Check if the drum and the transfer belt are
properly operated.
(ON: 03-101 / OFF: 03-151)
If they are not rotating normally, check if
their drive gears are damaged or if they
contact the equipment. Correct it if needed.
Proceed to step (9). (to step (5) for the
second time)
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Measures
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