Functional Overview
Paper
Feed System
Input Paper Sensor (PSI)
The Input Paper Sensor, PSI, is a four
position sensor that detects paper in the
Manual Feed Sense Position, the
‘“” Registration Position, and the Top
Position. The figure to the left shows the
Manual Feed and Cassette paper paths.
The figures below show the sensor in
each of the four positions.
@
Registration
The Ready or Wait/Standby Position
arm
indicates that paper has not entered the
paper path.
Input Paper
WAIT
Sensor (PSI )
(STBY)
A
The Manual Feed Sense Position (A)
indicates that paper has either been
inserted into the manual feed slot or has
been picked from the paper cassette and
reached this position in the paper path.
The Registration Position (B) signals
the DC Controller to monitor if the
scanner motor is up to speed and the
fuser is at the correct temperature.
When both conditions are met, the paper
continues to the Top Position. If these
conditions have not been met, solenoid
SL1 is engaged to stop the registration
roller until the printer is ready. When
the printer is ready, SL1 disengages and
paper proceeds to the Top Position.
The Top Position (C). When paper
paeses through the Top Position, the DC
Controller sends a signal to synchronize
the image on the photosensitive drum
with the top of the page.
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