Canon H1 Service Manual page 20

2
Technology > Controls (Reader)
AB type
Original sensor 1
Original detection
A5R
position 1
Original detection
B5R
position 2
Original detection
A5
position 3
Original detection
B5
position 4
K16
Original detection position 5
A4
Original detection position 6
CCD original detection position
Inch type
Original detection
STMTR
position 1
Original detection
position 2
LTRR
STMT
Original detection
position 3 LTR
CCD original detection position
2 Technology > Controls (Reader)
A4R
B4
K8
A3
Original sensor 2
LGL
279.4×431.8mm
(11"×17")
F-2-8
1. 2 points original detection at each detection position
For each point of measurement in main scanning direction, the machine checks the
presence/absence of an original with reference to the CCD output at 2 points near the point
of measurement.
* The machine checks if the signal is changed or not from ADF (pressure plate) open to close
at both points of 1A and 1B.
Change in the signal: Yes
Change in the signal: No
Judgment is done by the measurement results of 1A and 1B, and it indicates the presence
of original if either point shows No (absence). It indicates absence of original if both signals
show Yes (presence).
Borderline of
original size
approx 13mm
Borderline of
original size
Change
1A 1B
Yes Yes
No Yes
Yes No
No No
1A=additional
detection point 1
approx 4mm
1B=conventional
detection point 2
F-2-9
Result of detection
Original absence
Original presence
Original presence
Original presence
T-2-4
2-7
2-7