Canon GP405, Service Manual

Page: 75 / 682

COPYRIGHT © 1999 CANON INC. CANON 405/335 REV.0 JAN. 1999 PRINTED IN JAPAN (IMPRIME AU JAPON)
3-9
CHAPTER 3 EXPOSURE SYSTEM
C. Identifying the Size by the Paper Sensors (2)
The image processor PCB identifies the size of an original based on the combination of sensor
states:
In the table, "No" means th at the output level of the sensor did not change when it was read at
intervals of 0.1 sec after it had turned on in response to the closing of the copyboard cover
(detecting the presence of an original).
In the table, "Yes" means that the output level changed when it was read at intervals of 0.1 sec
after it had turned on in response to the closing of the copyboard cover (detecting the absence of an
original).
Table 3-400 (A/B originals)
Original
size
A3
B4
A4R
A4
B5
B5R
No
Original size sensor
0
No
Yes
Yes
No
Yes
Yes
Yes
1
No
No
Yes
No
No
Yes
Yes
2
No
No
No
Yes
Yes
No
Yes
3
No
No
No
Yes
Yes
Yes
Yes
Original
size
11x17
LGL
LTR-R
LTR
Original size sensor
0
No
Yes
Yes
No
1
No
No
No
Yes
2
No
No
Yes
Yes
Table 3-401 (Inch originals)