Canon LBP-2000 Service Manual download pdf (Page 104)

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CHAPTER 2

VII. PAPER FEEDER

A. Outline

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.

Paper feeder

controller PCB

Paper feeder

controller PCB

Paper feeder

controller PCB

DC controller PCB

Feed command

pickup command

Feed command

pickup command

Pickup command only

Figure 2-7-1

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Canon LBP-2000 Service Manual Page 104