Canon DADF-G1 Service Manual page 46

2.9 Detecting a Jam
S8
S1 Original tray sensor
S3 Registration paper sensor
S4 Upper cover sensor
The microprocessor on the DADF controller PCB is programmed in advance to check for
a jam at such times as needed, and a jam is identified in reference to the presence of an
original over a specific sensor.
T02-209-01 shows the conditions used to identify a jam.
When a jam is identified, the machine communicates its nature to its host copier, which in
response shows a corresponding code in its service mode.
Jam type
Pickup Extracted
Pickup delay
Registration delay S3, S7
Double-feeding
Original
COPYRIGHT© 2000 CANON INC.
S6
S1
S7
S3
S6 Delivery sensor
S7 Pickup sensor
S8 Reversal sensor
F02-209-01
Sensor
S1, S7 The sensor (S7) has not detected the leading edge of
an original 1500 msec after the pickup motor (M1)
turned on and, in addition, the sensor (S1) is not on.
S7 The sensor (S7) has not detected the leading edge of
an original 1500 msec after the pickup motor (M1)
turned on.
The sensor (S3) has not detected the leading edge of
an original 350 msec after the sensor (S7) detected
the leading edge of an original.
S3 The sensor (S3) remains on even when the 1st
original has been placed on the copyboard glass.
S3 The sensor (S3) has not detected the leading edge of
an original at the start of pickup.
T02-209-01
CANON DADF-G1 REV.0 OCT. 2000
CHAPTER 2 OPERATIONS AND TIMING
S14
S4
MS1 MS2
S14 Recirculation sensor
MS1 DADF open/close sensor
MS2 Upper cover switch
Description
M4
Code
01H
02H
03H
06H
08H
2-29