COPYRIGHT © 1999 CANON INC.
CANON DADF-B1 REV.0 APR. 1999 PRINTED IN JAPAN (IMPRIME AU JAPON)
2-43
CHAPTER 2 BASIC OPERATION
G. Detecting an Original Jam
The ADF uses the following sensors to check for original jams. The timing at which checks are
made is stored in advance in the CPU (Q1) on the ADF controller PCB, and a jam is identified in
relation to the presence/absence of paper over a specific sensor.
In response to a jam, the ADF communicates to the copier in the form of a code, which may be
checked in the copier’s service mode (COPIER>DISPLAY>JAM).
SR2 ...... pickup unit cover sensor
SR3 ...... separation sensor
SR4 ...... reversal inlet sensor
SR5 ...... reversal registration sensor/
delivery sensor
SR6 ...... ADF open/closed sensor
SR8 ...... reversal delivery
unit cover sensor
U502 .... pre-registration sensor
U503 .... original set sensor
U504 .... last original sensor
U505 .... reversal outlet sensor
U508 .... original detecting volume
Service Mode Screen (copier)
+/-
OK
< JAM >
< 1/7 >
< READY >
AA BBBB CCCC DDDD E FFFF G HHHHHH IIIII
AA BBBB CCCC DDDD E FFFF G HHHHHH IIIII
AA BBBB CCCC DDDD E FFFF G HHHHHH IIIII
AA BBBB CCCC DDDD E FFFF G HHHHHH IIIII
AA BBBB CCCC DDDD E FFFF G HHHHHH IIIII
AA BBBB CCCC DDDD E FFFF G HHHHHH IIIII
AA BBBB CCCC DDDD E FFFF G HHHHHH IIIII
AA BBBB CCCC DDDD E FFFF G HHHHHH IIIII
Display
Adjust
Function Option
Test
Counter
I/O
Jam code
'1' indicates that
the jam is in the ADF.
Figure 2-278
SR2
SR3
U503
U504
SR8
SR5
SR4
U505
U508
U502
Figure 2-279