Paper Feeder - Canon LBP-2000 Service Manual

VII. PAPER FEEDER
A. O u t l i n e
A paper feeder is used to pick up paper from any of the cassettes set inside, forwarding it to its
host printer. As many as three paper feeders may be connected to the Printer: the first paper
feeder will be referred to as PF1, while the second and third paper feeders are respectively referred
to as PF2 and PF3.
The sequence of operation of a paper feeder is controlled by the paper feeder controller PCB,
which is an 8-bit microprocessor. In addition to controlling the sequence of operation, the paper
feeder controller PCB also controls communication with the (serial) DC controller PCB of the
Printer.
The paper feeder controller PCB drives the motors and clutches in response to the various
commands from the DC controller PCB, while keeping the Printer informed of what takes place in
the paper feeder.
Figure 2-7-2 shows the flow of signals between paper feeder and Printer. The paper feeder is
supplied by the host with +24 VDC and +5 VDC.
DC controller PCB
Feed command
or
pickup command
Feed command
or
pickup command
Pickup command only
Figure 2-7-1
CHAPTER 2

Paper feeder

controller PCB

Paper feeder

controller PCB
Paper feeder
controller PCB
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