126 Theory of operation C7085-90921
Tray 3 (500-sheet paper feeder)
Power supply
The printer supplies +24 V and +5 V to the paper feeder for power. The paper feeder is controlled
by the DC controller. It does not contain a microcomputer (CPU) or a drive motor. Its rollers are
controlled by the printer’s pick-up motor (M2).
Pick-up and feed system
Three switches (SW3001, SW3002, and SW3003) on the paper feeder PCB detect the paper size
and presence of a cassette. The DC controller activates the pick-up motor (M2) and turns on the
paper feeder pick-up solenoid (SL3001) after the pick-up motor starts. The paper feeder pick-up
roller is activated by the pick-up motor and picks up the paper. Once the separation roller separates
the paper from any extra sheets of paper, paper is fed into the printer by the paper feeder feed roller
and printer feed roller.
The rest of the paper path is the same as that in the Tray 2 cassette (see Figure 5-26).
Figure 5-30 Pick-up and feed system
Table 5-4 Solenoids, sensors, switches
Reference Description
SL3001 Paper feeder pick-up solenoid
PS3001 Paper feeder paper detection sensor
SW3001 Paper feeder paper-size detection switch
SW3002 Paper feeder paper-size detection switch
SW3003 Paper feeder paper-size detection switch
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