Detecting Jams; Overview - Canon DADF-Q1 Service Manual

4) The machine rotates the transport belt. The original is moved over a specific distance after its trail edge has moved past the reversal sensor (S1), and is then
stopped.
5) The host machine starts printing operation.
6) When the host machine's scanner starts to move in reverse, the machine starts to rotate the transport belt and the delivery roller, thus moving the original to the
delivery assembly.
Sequence of Operation
Manual feeder placement
sensor(PI 12)
Belt motor (M2)
Delivery solenoid (M5)
Reversal solenoid
(SL4)
Reversal sensor
(SL1)
Original delivery
sensor(PI 1)
Original placed in
manual feeder(PI 13)

2.7 Detecting Jams

2.7.1 Overview

The machine checks for jams using the following sensors. The CPU on the ADF controller PCB runs a check at such times as programmed in advance, and detects
the presence/absence of a jam in relation to the presence/absence of paper over a specific sensor.
Upon detection of a jam, the machine communicates the fact to the host machine, which in turn indicates the fact in service mode in the form of a code. A check
may also be made with reference to the indicator (LED2) of the machine's ADF control PCB.
Service Mode Screen of the Host Machine
Reversal sensor(S1)
Reversal sensor(S1)
Copy
Original placed in manual feeder
Start key ON
pickup
F-2-117
F-2-118
F-2-119
F-2-120
original placed
move
discharge
print
F-2-121
Chapter 2
0.4 sec (approx.)
0011-2392
2-47