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I
OPERATIONS
AND
TIMING
IV.
PAPER
TRANSPORT
SYSTEM
A.
Paper
Pick-up
Assembly
and
Feeder
1.
Outline
When
the pick-up
clutch
solenoid (SL1)
engages, main motor
(M1)
turns the
roller,
feeding a sheet
of
copy paper
to
the
registration
rollers.
The number
of
rotations
of
the pick-up
roller
varies with the length
of
the
copy
paper.
The
copy paper
is
fed
by
the
registration
rollers
so
that
its
leading
edge
is in
line
with
the leading
edge
of
the toner
image on
the
photosensitive
drum.
It
then
passes
through
the
transfer,
separation,
feed,
fixing
and
delivery
stages
to
the
copy
tray.
The
copy paper
is
sensed
by
paper
sensor (Q2 and
Q5).
If
it
does
not
reach
or
pass
the
sensors
within
the specified
period,
the
DC
controller
PCB
judges
that
a
jam
has
occurred
and causes
the
JAM
indicator
on
the
control
panel
to flash.
Cassette paper sensor, (Q11)
senses
whether
there
is
paper
in
the cassette.
If
there
is
not,
the
CASSETTE PAPER EMPTY
signal
(CPEP) becomes
"0",
causing
the
ADD
PAPER
indicator
on
the
control
panel
to
go
ON.
Pick-up
roller
Control
ring
Figure 3-32
(rear)
Paper
detection signal
2
(PDP2)
DC
controller
PCB
Figure 3-33
3-30
COPYRIGHT©
1992
CANON
INC.
CANON
MP-1
550
REV.1
SEPT. 1992
PRINTED
IN
JAPAN (IMPRIMEAUJAPON)
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