Phaser 4500/4510 Service Manual 2-15
Theory of Operation
Paper Feeder
Tray 1 and tray 2 are functionally equivalent in terms of the paper size switch
assembly, no paper actuator, and no paper sensor. The component
descriptions given here apply to both trays.
Since the low paper actuator and low paper sensor are not part of tray 1, the
description of these components applies to tray 2 only.
150-sheet/550-sheet feeder assembly This mechanism moves paper from the
paper tray into the printer. The driving force from the main motor is transmitted
via the feed clutch assembly to the feed roller and nudger roller, transporting
paper from the tray into the printer.
No paper actuator This actuator is kept in a raised position by the paper in the
tray. If the 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 This is a photo sensor that remains in the OFF state when
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.
Registration sensor The registration sensor is a photo sensor that detects
paper as it arrives at the registration rollers. The paper transported from the
paper tray pushes up the actuator of the registration sensor, moving the flag
out of the sensor.
Registration clutch This electromagnetic clutch turns on and off to drive the
rubber and metal registration rollers, which place the paper in position at the
appropriate time for transfer of the developed image from the drum.
Low paper actuator When paper is low in the paper tray installed in tray 2, the
arm of the low paper actuator is pushed up by the bottom plate assembly,
moving the actuator flag out of the sensor. Low paper sensing occurs only in
the 550-sheet feeders, which includes tray 2 and if installed, trays 3 and 4.
Low paper sensor This photo sensor remains in an OFF state until the paper
level in the tray drops sufficiently to move the low paper actuator flag out of
the sensor.
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General
Weight and Dimensions
