Toshiba e-STUDIO 5540C Service Manual page 921

Step Check item
2 Is the sensor shutter of the
image quality sensor
opening or closing normally?
Or is it damaged?
Is the sensor surface of the
image quality sensor stained
with toner? If so, has it been
cleaned?
3 Is the connector of the
image quality sensor
securely connected?
Is the connector CN307 on
the LGC board securely
connected?
Is the harness between the
LGC board and the image
quality sensor
disconnected?
4 Is +12V power supply
voltage normally supplied to
the image quality sensor?
Is +12V voltage normally
output by the CN301-9pin on
the LGC board?
5 Set the values of "Image
quality closed-loop control /
Contrast voltage (08-2486)"
and "Drum surface potential
sensor control setting (08-
2561)" to "0" (Invalid).
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Result
YES [4546] [START]
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)
YES
NO <Checking procedure>
Reconnect the connector.
Replace the harness.
Proceed to step (9). (to step (5) for the
second time)
YES
NO <Checking procedure>
1. Check if +12V voltage is output by the
switching regulator (PS-ACC CN404-7pin).
2. Check if +12V voltage is output by the
CN301-9pin on the LGC board.
Check if the supply harness between the
switching regulator and the LGC board is
open circuited, damaged or disconnected.
Proceed to step (9). (to step (5) for the
second time)
8 - 165
Measures
e-STUDIO5540C/6540C/6550C/5560C/6560C/6570C
ERROR CODE and TROUBLESHOOTING
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step
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