2.1.2. Original Detection
1. Book Scanner
The original width and length sensors each have two sets of photoemitter
and receiver. The actual detection points on the exposure glass are W1, W2,
L1 and L2 in the diagram. The cpu continuously checks the sensor outputs
when the platen cover is open. The machine uses the paper size detected
just before the platen cover is closed (or before pressing the Start key if the
platen cover is kept open). The table below shows the paper size detected for
each set of sensor outputs, and the data width selected for a fax transmission.
Sensor Outputs
USA
Europe and Asia
Data Width in Fax Tx
W1 W2 L1
L2
0
0
0
0
B4 Lengthwise
B4 Lengthwise
256 mm
0
1
0
1
Letter Lengthwise
(Note 1)
A4 Lengthwise
(Note 1)
216 mm
1
1
0
1
B5 Lengthwise
B5 Lengthwise
216 mm
0
0
1
1
B5 Sideways
B5 Sideways
256 mm
0
1
1
1
Half-Letter Sideways
(Note 1)
A5 Sideways
(Note 1)
216 mm
0
1
0
0
Legal Lengthwise
(Note 1)
F/F4 Lengthwise
(Note 1)
216 mm
1
1
1
1
Size not detected
(Note 2)
A5 Lengthwise or
Size not detected
(Note 3)
216 mm (US)
216 or 256 mm (Other)
(Note 4)
Sensor output: 0 = Original present; 1 = Original not present
B4
A4/Letter
B5
A5/Half Letter
W1
W2
L1
L2
B5 Sideways
B4
F
A4
B5
A5
A5
B5
F
A4
B4
224.4
192.9
8
1/2
5
1/2
11
14
306.2
243
Original Width
Sensor
Legal
Original Length
Sensor
H521D502.wmf
May 22nd, 1995
DETAILED SECTION DESCRIPTIONS
SCANNER
2-3