Ricoh B230 Service Manual page 850

The toner is moved from the OPC [A] onto the surface of the image transfer belt [B] by a
positive charge from the image transfer roller (immediately above the drum, not shown
here). The ITB drive roller [C], which is given a negative charge, pushes the toner to the
paper [D].
The paper transfer roller [E] presses the paper against the image transfer belt [B] (with a
spring that is under tension from the paper transfer roller contact motor), and grounds the
charge from the ITB drive roller [C]. (The paper transfer roller does not have a drive
mechanism. This roller is driven by the image transfer belt.)
Finally, the discharge plate [E], which is given an AC charge, discharges the paper.
The discharge plate receives its charge from a different high voltage power supply board
than the ITB drive roller.
PTR (Paper Transfer Roller) Contact and Separation
The paper transfer contact motor [A] keeps the paper transfer roller [B] in contact with the
image transfer belt [C]. This motor has the paper transfer HP sensor [D] inside. The paper
transfer HP sensor detects if the paper transfer roller is in contact with the image transfer
belt. Only when the machine executes the line position adjustment or process control, the
B230/B237 6-52 SM