Optional 550-Sheet Feeder - Xerox Phaser 4500 Service Manual

Theory of Operation
2-40
Functional Components
The paper tray used in the optional feeder is identical to the 550-Sheet paper
tray used by the base engine, so the description of the paper tray is omitted
here.
Option paper size switch assembly
paper supplied from each paper tray is mounted in the left tray guide. A signal
indicating the paper size is transmitted as a voltage to the HVPS/engine logic
board.
No paper actuator
tray. If the paper tray runs out of paper, the no paper actuator drops and the
flag of the no paper actuator moves from between the sensor arms, allowing
the sensor to turn on.
No paper sensor
paper is present in the tray. The sensor turns on when there is no paper in the
tray and the flag on the no paper actuator moves out of the sensor.
Low paper actuator
paper actuator is pushed up by the bottom plate assembly, moving the
actuator flag out of the sensor.
Low paper sensor
level in the tray drops sufficiently to move the low paper actuator flag out of
the sensor.

Optional 550-sheet feeder

paper tray into the printer. The driving force from the feeder motor is
transmitted via the feed clutch assembly to the feed roller and nudger roller,
transporting paper from the tray into the printer.
As the nudger roller picks up paper and the paper level lowers, the position of
the nudger roller drops accordingly. The lowered nudger roller pushes down
the lock lever of the bottom plate assembly, releasing it. The spring below the
bottom plate assembly pushes it up and lifts the paper, which lifts the nudger
support assembly off of the lock lever of the bottom plate assembly stopping
its upward motion.
Turn roller This roller, working with the turn pinch roller, advances the paper
picked by the nudger and feed rollers into the printer. The feeder motor drives
the turn roller through the turn roller clutch.
550-sheet feeder PWBA
receives instructions from the HVPS/engine logic board and from sensors and
switches; the CPU controls feeding operation in the 550-sheet feeder.
A bank of switches for setting the size of
This actuator is kept in a raised position by the paper in the
This is a photo sensor that remains in the OFF state when
When paper is low in the paper tray, the arm of the low
This photo sensor remains in an OFF state until the paper
This is a mechanism for supplying paper from the
A CPU installed in the 550-sheet feeder PWBA
Phaser 4500/4510 Service Manual