Detecting Jams; Detecting Jams (Finisher Unit) - Canon J1 Service Manual

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Technology > Detecting Jams > Detecting Jams (Finisher Unit)

Detecting Jams

Detecting Jams (Finisher Unit)

The following sensors are used to detect the presence of paper and to determine that paper
is delivered properly.
- Inlet sensor (PI103)
- Delivery sensor (PI104)
A jam is identified by checking whether paper is present at each sensor at the timing
programmed in the memory of the microcomputer (CPU) on the finisher controller PCB.
When the CPU identifies a jam, it suspends the finisher's delivery operation and informs the
host machine DC controller of the presence of a jam.
When all doors are closed after the paper jam is removed, the finisher checks whether paper
is detected by the above two sensors (inlet sensor and tray 1 delivery sensor).
If the sensors detect paper, the finisher determines that paper jam is not completely removed
and sends a jam removal signal to the host machine once more.
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Technology > Detecting Jams > Detecting Jams (Finisher Unit)
PI104 PI104 PI103
F-2-81
Jam Type Sensor
Inlet sensor delay PI103 When the inlet sensor (PI103) does not detect paper after a
prescribed time (distance) has elapsed since receiving a delivery
signal from the host machine.
Inlet sensor PI103 When paper does not exit the inlet sensor (PI103) after delivering for
a prescribed time (distance) after the inlet sensor (PI103) detected
stationary
paper.
Feed path sensor PI104 When the feed path sensor (PI104) does not detect paper after
prescribed time (distance) has elapsed since the inlet sensor (PI103)
delay
detected paper.
Feed path sensor PI104 When paper does not exit the feed path sensor (PI104) after
delivering for a prescribed time (distance) after the delivery sensor
stationary
(PI104) has detected paper.
Timing PI103 When the inlet sensor (PI103) detects paper before receiving a
delivery signal from the host machine.
Staple PI50 When the staple motor (M111) is rotated forward, the staple home
position sensor (PI5) does not turn back ON after a prescribed time
has elapsed after it goes OFF, and the staple home position sensor
(PI50) becomes ON within prescribed time after the staple motor
(M111) is rotated backward.
• Replace the stapler unit when the staple home position sensor
(PI50) becomes faulty since it is built in the stapler unit.
Power-on PI103 When paper is detected by the inlet sensor (PI103) or the delivery
path sensor (PI104) during power on.
PI104
Door open PI101 When the upper cover open/close sensor (PI101), front cover
open/ close sensor (PI102), or the front cover close detect switch
PI102
(MSW101) detects that the cover is opened.
MSW101
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Jam Condition
T-2-10
2-37