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12 February 1992
If there is any difference between the first and second check, the CPU judges
if the original exists above the respective sensor or not according to the
following table.
Second
First data
data
High
High
High
Low
Low
High
Low
Low
The CPU finally determines the original size from the above judgments. The
following table shows how the original size is determined with information of
each sensor.
Sensors
Original Size
A3
11" x 17"
11" x 15"
B4
10" x 14"
—
8
1/2
F4
A4 lengthwise
8
1/2
B5 lengthwise
8" x 10"
or smaller
5
" x 8
1/2
A5 lengthwise
or smaller
A4 sideways
11" x 8
or smaller
B5 sideways
8
" x 5
1/2
A5 sideways
8
" x 5
1/2
or smaller
or smaller
If the start key is pressed with the platen cover open, the CPU uses the
original size data detected when the start key is pressed.
If an original is fed on to the exposure glass through the ARDF, the CPU
uses the original size data from the ARDF.
Judgment
Paper exists
No paper
Indicates
"Check
paper size"
Paper exists
Original Width
Sensors
Original Width
Sensor
S21–1 S21–2 S20–1 S20–2
O
O
O
O
" x 14"
X
O
—
X
O
" x 11"
X
O
X
O
"
1/2
X
X
"
O
O
1/2
"
O
O
1/2
"
1/2
X
O
2-31
S21–2
S21–1
S20–1
S20–2
Original Length Sensors
Original Length Sensor
(S20–3)
O
O
O
O
O
O
O
O
O
O
O
X
X
X
O
X
X
X
X
X
O: Paper exists X: No paper
OPTICS
(S20–3) S20–4
S20–5
S20–4 S20–5
O
O
O
O
O
X
O
O
X
O
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
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