Detecting An Original Jam - Canon DADF-B1 Service Manual

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).
SR3
U503
SR2
U502
U508
Figure 2-279
COPYRIGHT © 1999 CANON INC. CANON DADF-B1 REV.0 APR. 1999 PRINTED IN JAPAN (IMPRIME AU JAPON)
Service Mode Screen (copier)
Display I/O Adjust Function Option
< JAM > < 1/7 >
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
Figure 2-278
U504
SR8
CHAPTER 2 BASIC OPERATION
Test Counter
< READY >
OK
+/-
Jam code
'1' indicates that
the jam is in the ADF.
U505
SR2 ...... pickup unit cover sensor
SR3 ...... separation sensor
SR4 ...... reversal inlet sensor
SR5 ...... reversal registration sensor/
SR6 ...... ADF open/closed sensor
SR8 ...... reversal delivery
U502 .... pre-registration sensor
SR5
U503 .... original set sensor
U504 .... last original sensor
SR4
U505 .... reversal outlet sensor
U508 .... original detecting volume
delivery sensor
unit cover sensor
2-43