Canon NP6012 Service Manual page 126

H. Detecting Original Jams
The ADF is equipped with three jam
sensors (PI1 through P13) 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.
PI3
Pi2
Plt: delivery sensor
PI2: registration sensor
P13: otiginal placement sensor
Figure 3-722
Type of Original Jam and Condition of Detection
[Operation] Type ofjam | Sensor] Conditions
Residual original PI, PI 2|When the tst original is separated, the delivery sensor (P11)
turns on while the belt motor rotates for 300 ms or less o}
before the registration sensor (PI2) turns on.
When the 1st original is picked up, the registration senso
delivery sensor (PI1) are on.
When separation starts, the registration sensor (PI2) does not
turn on after 2 sec.
When pick-up starts, the registration sensor (P12) does nol!
Pick-up delay
Delivery delay jam
'The ADF is opened while in operation.
PI 1, Pl2|When delivery starts, the delivery sensor (PI1) does not
detect an original that has been fed about 100 mm.
After the registration sensor (P12) has turned off, the delive!
sensor (PI1) does not detect an original that has been fed fo!
about 500 mm.
During pick-up, the delivery sensor (PI) remains on even
when the original is fed for 'length + about 60 mm'.
Table 3-703
Delivery stationary jam
COPYRIGHT © 1995 CANON INC, CANON NPSO12/NP6O12F /NP6212 REV.t SEPT. 1995 PRINTED IN JAPAN ((MPRIME AU JAPON} 3-81