Canon DADF-J1 Service Manual page 97

CHAPTER 2 OPERATIONS AND TIMING
3 Jams
The DADF uses the sensors shown in F02-301-03 to detect a jam. The timing at which
jam detection is tuned on is programmed in advance in the CPU on the ADF controller PCB,
and the presence/absence of a jam is detected in relation to the presence/absence of paper
over a specific sensor.
When a jam is detected, the DADF communicates the fact to the copier in the form of a
code, and some copiers allow a check on jam codes in service mode. The indicator (LED2)
on the ADF controller PCB of the DADF may also be used to check codes.
Copier's Service Mode Screen
Indication on the DADF
The indication (LED2) on the ADF controller PCB is based on how the LED flashes (four
times); for example, if the code is J-13,
PI 7
PI 4
S4,S5
S2
S3
S1
2-74
Display I/O Adjust Function
< JAM > < 1/7 >
01 0202 1707 1708 0 010B
02 0202 1704 1706 0 010B
03 0 020A
0202 1703 1703
04 0202 1611 1623 2 1400
0202 1611 1611 2 1400
05
06 0202 1533 1534 2 1400
07 - - - - - - - - - - - - - - - - -
- - - - - - - - - - - - - - - - -
08
F02-301-01 Screen
F02-301-02
PI6
PI3
S6
(light-emitting)
PI 8,
PI 9
S8
S6
(light-receiving)
F02-301-03
COPYRIGHT © 2001 CANON INC.
Option Test Counter
< READY >
7 11 A4
A4
7 9
7 7 A4
7 3 A4
0 0 - - - - -
- - - - -
0 0
- - - - - - - - - - - -
- - - - - - - - - - - -
Jam code
See tables T02-301-01 and later.
'1'indicates a jam in the machine.
S7
2000 2000 2000 2000
PI12
S9
PI 13
PI 10
CANON DADF-J1 REV.0 MAR.2001