Canon DADF-G1, Service Manual

Page: 46 / 154

COPYRIGHT© 2000 CANON INC. CANON DADF-G1 REV.0 OCT. 2000
CHAPTER 2 OPERATIONS AND TIMING
2-29
2.9 Detecting a Jam
S1 Original tray sensor S6 Delivery sensor S14 Recirculation sensor
S3 Registration paper sensor S7 Pickup sensor MS1 DADF open/close sensor
S4 Upper cover sensor S8 Reversal sensor MS2 Upper cover switch
F02-209-01
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 Sensor Description Code
Pickup Extracted S1, S7 The sensor (S7) has not detected the leading edge of 01H
an original 1500 msec after the pickup motor (M1)
turned on and, in addition, the sensor (S1) is not on.
Pickup delay S7 The sensor (S7) has not detected the leading edge of 02H
an original 1500 msec after the pickup motor (M1)
turned on.
Registration delay S3, S7 The sensor (S3) has not detected the leading edge of 03H
an original 350 msec after the sensor (S7) detected
the leading edge of an original.
Double-feeding S3 The sensor (S3) remains on even when the 1st 06H
original has been placed on the copyboard glass.
Original S3 The sensor (S3) has not detected the leading edge of 08H
an original at the start of pickup.
T02-209-01
S8
S3
S7
S1
S4
S14
M4
MS1 MS2
S6