Canon NP6012F Service Manual page 119

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H. Detecting Original Jams
The ADF is equipped with three jam
sensors (PI1 through Pl3) as indicated in
Figure 3-722 to monitor the movement of
originals.
The movement of originals are checked
at such times as programmed in the CPU on
the ADF controller PCB; a jam is identified in
relation to the presence of an original at
each sensor.
Table 3-703 describes the type of jam,
condition of detection, and
sensors involved.
,,--., -\
+
+
(-J/p
Li2-G t +
PI2
PI3
PII:
delivery sensor Pl2: registration sensor
~13:
original placement sensor
Figure 3-722
Type of Original Jam and Condition of Detection
gperation
1
Type of jam
1
Sensor
1
Conditions
IResidual original
1
PI 1, PI 2jWhen the 1st original is separated, the delivery sensor (PII)
I I
turns on while the belt motor rotates for 300 ms or less o
before the registration sensor (P12) turns on:
1
When the 1st original is picked up, the registration sensor
(Pl2) and the delivery sensor (PII) turn on.
Pick-up Original present at start PI 1, PI 2 When separation starts, the registration sensor (P12) or the
delivery sensor (PII) are on.
Separation delay
PI 2 When separation starts, the registration sensor (Pl2) does not
turn on after 2 sec.
Pick-up delay
PI 2 When pick-up starts, the registration sensor (P12) does not
turn off after feeding the original for about 500 mm.
ADF open
MS1 The ADF is opened while in operation.
Delivery delay jam
PI 1, PI 2 When delivery starts, the delivery sensor (PII) does not
1 I detect an original that has been fed about 100 mm.
Delivery
After the registration sensor (P12) has turned off, the delivery
sensor (PII) does not detect an original that has been fed for
about 500 mm.
Delivery stationary jam
PI 1
During pick-up, the delivery sensor (PII) remains on even
when the original is fed for 'length + about 60 mm'.
Table 3-703
COPVRlGHl
@ 1995 CANON INC.
CANON NP9012
I
NP6012F/NPb212 REV.1 SEPT. 1995 PRINTED IN JAPAN (IMPRIM~ AU JAPON)
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