Ricoh P C300W Field Service Manual page 285

The black drum motor [A] controls the transfer belt drive roller [B]. The belt tension roller adds tension to
the transfer belt to help to turn this belt.
The image transfer belt rollers [C] are charged from terminal plates to move the toner from the OPCs to
the image transfer belt.
Transfer Belt Contact
The transfer belt does not touch the color OPC drums (cyan, magenta, and yellow) when the machine
makes a black and white print.
The ITB contact motor [A] turns the CMY contact camshaft [B] when the machine starts to make a color
print. The CMY contact cams slide the right and left sliders [C] and these sliders lift the belt transfer
rollers for each OPC drum (CMY) to the transfer belt. Because of this mechanism, the life of the transfer
belt is longer (it is not necessary for the transfer belt to touch the color OPC drums when the machine
makes a black and white print).
The ITB contact sensor [D] detects if the image transfer rollers for each OPC drum (CMY) touch the
transfer belt.
If one of the following problems with transfer belt contact occur, SC442 is displayed.
•
SC442-01: Home position shift abnormality (ITB contact sensor does not detect the home position
at the time of power on/ cover opening and shutting)
•
SC442-02: Contact position shift abnormality (ITB contact sensor does not detect that the transfer
belt touches the color OPC drums when the machine makes a color print)
•
SC442-03: Spaced position shift abnormality (ITB contact sensor does not detect that the transfer
belt moves away from the color OPC drums when the machine makes a black and white print)
7.Detailed Descriptions
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