Ricoh FT8680 Service Manual page 155

31 July 1995
18.4 PAPER SIZE DETECTION
Detected Size in Normal
Mode
Detected Size in Moving
Original Scan Mode
Paper Size Sensor 1
Paper Size Sensor 2
Paper Size Sensor 3
Paper Size Sensor 4
1 = Interrupted 0 = Not Interrupted S = Sideway L = Lengthwise
Four photo-interrupters [A] are used to detect paper width on the by-pass
tray. The sensor status changes depending on the side guide positions.
The above table shows the relationship between the sensor status and
recognized paper size. In the normal copy mode, the machine recognizes
that the paper on the by-pass table is set in sideways. In the moving original
scan mode, the machine recognizes that the paper on the table is set in
lengthwise.
MOVING ORIGINAL SCAN AND BY-PASS FEED TABLE
B6S A5S B5S
B5L A4L B4L
0 1
0 0
0 0
0 0
2-131
[A]
A171D560.img
A4S B4S
A3L B3L
1 1 0
1 1 1
0 1 1
0 0 1
A3S
A2L
0
0
1
1