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3. OPERATIONS AND TIMING
C. Jam Detection
The copier has two sensors
to sense
whether copy paper is being fed normally.
l
Preregistration
paper sensor (02)
-
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.
The microprocessor
identifies a jam in
-
any of the following
four cases.
Also, the
microprocessor
judges that there is a jam if
I
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.
a.
Multifeeder
COPY START
JAM indicator
key ON
flashes
_-..
Figure 3-43 (multifeeder
pick-up assembly delay jam)
b.
Cassettes
COPY START
JAM indicator
key ON
flashes
*
Upper cassette:
1.8 set
Lower cassette: 2.7 set
Figure 3-44 (cassette pick-up assembly
delay jam)
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