COPYRIGHT © 1998 CANON INC. CANON DADF-A1 REV.0 DEC. 1998 PRINTED IN JAPAN (IMPRIME AU JAPON)
2-47
CHAPTER 2 BASIC OPERATION
K. Detecting Original Jams
MS1 MS2
M4
S14
S4
S1
S7
S3
S8
S12
S6
S1
Original tray paper
sensor
S3
Registration paper sensor
S4
Upper cover sensor
Figure 2-269
The timing at which the machine checks for jams is stored in memory in the microprocessor on
the DADF controller PCB, and a jam is detected in terms of the presence/absence of paper at a
specific sensor at the time.
When a jam is detected, the machine communicates the fact to the copier in the form of a code.
(Some copiers show such codes in service mode.)
Jam type
Original retraction
Pick-up delay
Registration delay
Sensor type
S1,S7
01H
02H
03H
S3,S7
S7
Description
Code
Pick-
up
The sensor S7 does not detect the leading edge of an original
1500 msec after the pick-up motor (M1) has turned on and, in
addition, the sensor S1 does not detect an original.
The sensor S7 does not detect the leading edge of an original
1500 msec after the pick-up motor (M1) has turned on.
The sensor S3 does not detect the leading edge of an original
350 msec after the sensor S7 has detected the leading edge of
an original.
Table 2-209a
S6
Delivery sensor 1
S7
Pick-up sensor
S8
Reversal sensor
S12 Delivery sensor 2
S14 Re-circulation sensor
MS1 DADF switch
MS2 Upper cover switch