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I
OPERATIONS
AND
TIMING
I
C.
Jam
Detection
The
copier
has two sensors
to
sense
whether copy paper
is
being
fed normally.
•
Pre-registration
paper sensor
(Q2)
•
Delivery
paper sensor
(Q5)
Paper jams can be
identified
by the
microprocessor by reading
signals
from
the
sensors
at
predetermined times
to
check
if
paper
is
at
or not
at
a sensor
at
that time,
and
thus
identify
if
the
paper
is
moving
through
the copier
correctly.
If
a jam
occurs, the copier
memorizes
the
number
of
copies
that
have
not yet
been
made
and
also the copier
settings.
This
information
is
stored
in
the
copier,
even
if
the
power
is
cut
off
by opening
the
front
door
in
order
to reset
the
copier.
a.
Multifeeder
The
microprocessor
identifies
a
jam
in
any
of
the
following four
cases.
Also,
the
microprocessor judges
that
there
is
a
jam
if
one
of
the
sensors
detects
paper
when
the
power
is
switched
ON.
1
.
Pick-up
assembly
delay
jam
If
the
copy paper does
not
reach the
paper sensor
of
the pick-up
assembly
within
a
specified period
after
paper
pick-up-starts,
the
microprocessor
will
judge
that
a
pick-up
delay
jam has
occurred,
and
immediately
stop the operation
of
the
copier. Also,
the
JAM
indicator
on
the
control
panel
will
flash
and
a
segment
of
the
PAPER SELECT/JAM
indicator
will
go
ON.
copy;
key
START
ON
r
JAM
indicator
flashes
T
STBY
INTR
SCFW
SCRV
SCFW
.
S
Multifeeder clutch
(CL2)
MEI=
<i
JAM
check
--1 sec.-*
—
1se<
1
i
1
Pre-registration
paper sensor
(Q2)
Normal
Abnorr
ial
Main motor
(M1
)
<i
Figure
3-41 (Multifeeder
pick-up
assembly
delay jam)
b.
Cassette
COPY
START
key
ON
Pick-up
clutch
solenoid (SL1
)
JAM
check
STBY
INTR
^
SCFW
SCRV
JAM
indicator
flashes
i.
SCFW
Pre-registration
paper sensor
(Q2)
signal
Normal
Ab
normal
Main motor (M1)
Figure 3-42 (Cassette pick-up
assembly
delay jam)
COPYRIGHT©
1992
CANON
INC.
CANON
NP-1S50
REV.1 SEPT. 1992
PRINTED
IN
JAPAN
(IMPRIHE
AU
JAPON)
3-37
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