Canon PC720 Service Manual - Page 95

Detecting

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4fAggtmOXi OPERATIONS AND TIMING ei E. Detecting Jams The copier is equipped with two copy paper sensors to check the presence/absence of copy paper and whether it is moving normally. • registration sensor (Q751) • delivery sensor (PS3) The presence/absence of copy paper or a jam is checked in reference to the presence/absence of copy paper at the respective sensors at such times as stored in the microprocessor in advance. The copier does not keep a record of the remaining number of copies to make or the copy mode effective at time of a jam so that it will be reset to standard mode when you open the copier to remove jams. The microprocessor has the following five 'no paper/jam' detection sequences, and it also identifies a jam if any of the sensor detects copy paper at power-on. 1. Absence of Paper in the Multifeeder Pick-Up Assembly (pick-up delay jam) In multifeeder mode, if copy paper does not reach the registration sensor within a specific period of time, the copier identifies a jam, stops the main motor in about 3 sec, and indicates the Add Paper message. If the registration sensor detect copy paper within this 3-min period (approx.), the copier identifies a pick-up delay jam and flashes the Jam message. Copy Start key ON V STBY INTR SCFW { Pick-up clutch solenoid (SL1) Jam check Registration sensor (Q751) Main motor (M1) 2.1sec 4 normal Figure 3-421 (normal) COPYRIGHT © 1994 CANON INC. CANON PC72OIT40R50ITTO REV.O AUG.1994 PRINTED IN JAPAN iIMPRIMEAUJAPON) 3 - 55

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4fAggtmOXi
OPERATIONS
AND
TIMING
ei
E.
Detecting
Jams
The
copier
is
equipped
with
two
copy
paper
sensors
to
check
the
presence/absence
of
copy
paper
and
whether
it is
moving
normally.
•
registration
sensor
(Q751)
•
delivery
sensor
(PS3)
The
presence/absence
of
copy
paper
or
a
jam
is
checked
in
reference
to
the
presence/absence
of
copy
paper
at
the
respective
sensors
at
such
times
as
stored
in
the
micro-
processor
in
advance.
The
copier
does
not
keep
a
record
of
the
remaining
number
of
copies
to
make
or
the
copy
mode
effective
at
time
of
a
jam
so
that
it
will
be
reset
to
standard
mode
when
you
open
the
copier
to
remove
jams.
The
microprocessor
has
the
following
five
'no
paper/jam'
detection
sequences,
and
it
also
identifies
a
jam
if
any
of
the
sensor
detects
copy
paper
at
power
-on.
1.
Absence
of
Paper
in
the
Multifeeder
Pick
-Up
Assembly
(pick-up
delay
jam)
In
multifeeder
mode,
if
copy
paper
does
not
reach
the
registration
sensor
within
a
specific
period
of
time,
the
copier
identifies
a
jam,
stops
the
main
motor
in
about
3
sec,
and
indicates
the
Add
Paper
message.
If
the
registration
sensor
detect
copy
paper
within
this
3
-min
period
(approx.),
the
copier
identifies
a
pick-up
delay
jam
and
flashes
the
Jam
message.
Pick-up
clutch
solenoid
(SL1)
Jam
check
Copy
Start
key
ON
V
STBY
INTR
SCFW
{
2.1
sec
Registration
sensor
(Q751)
Main
motor
(M1)
4
normal
Figure
3-421
(normal)
COPYRIGHT
©
1994
CANON
INC.
CANON
PC72OIT40R50ITTO
REV.O
AUG.1994
PRINTED
IN
JAPAN
iIMPRIMEAUJAPON)
3
-
55