158 Theory of operation ENWW
Secondary transfer unit
The secondary transfer unit consists of components, such as the secondary transfer roller,
secondary transfer roller engaging cam, and secondary transfer engaging sensor.
The secondary transfer roller transfers the toner on the ITB to the paper. It is interlocked with the
ITB. The secondary transfer roller engaging cam is to engage or disengage the secondary transfer
roller from the ITB. It is rotated by the delivery motor (M1) as the secondary transfer roller
engaging solenoid (SL4) opens or closes.
The secondary transfer roller engaging sensor monitors whether or not the roller is engaged with
the ITB.
The transfer section performs the following:
1 ITB cleaning control
2 Waste toner level monitor
3 Primary transfer roller engaging/disengaging control
4 Secondary transfer roller engaging/disengaging control
5 Secondary transfer roller engaging/disengaging detection
The above operations are discussed in the following sections.
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