Gestetner A294, Service Manual

Page: 66 / 600

SCANNING
A294/A295 2-16 SM
Original Size
Length
Sensor
Width Sensor
A4/A3 Version LT/DLT Version 2 1 3 4 5
SP4301
Display
A3 11" x 17"
❍ ❍ ❍ ❍ ❍
00011111
B4 10" x 14"
❍ ❍ ❍ ❍ ✗
00011110
F4 8
1/2
" x 14" (8" x 13")
❍ ❍ ❍ ✗ ✗
00011100
A4-L 8
1/2
" x 11"
✗ ❍ ❍ ✗ ✗
00001100
B5-L —
✗ ❍ ✗ ✗ ✗
00001000
A5-L 5
1/2
" x 8
1/2
"
✗ ✗ ✗ ✗ ✗
00000000
A4-S 11" x 8
1/2
"
✗ ✗ ❍ ❍ ❍
00000111
B5-S —
✗ ✗ ❍ ❍ ✗
00000110
A5-S 8
1/2
" x 5
1/2
"
✗ ✗ ❍ ✗ ✗
00000100
-L: Lengthwise -S: Sideways
❍
:High (Paper Present)
✗
: Low
The original size data is taken by the main CPU when the DF position sensor is
activated. This is when the DF is positioned about 12 cm above the exposure
glass. At this time, only the sensor(s) underneath the original receive the reflected
light and switch on. The other sensor(s) are off. The main CPU recognizes the
original size from the on/off signals from the five sensors.
If the copy is made with the ADF open, the main CPU decides the original size
from the sensor outputs when the Start key is pressed.
The above table shows the outputs of the sensors for each original size. This
original size detection method eliminates the necessity for a pre-scan and
increases the machine productivity.
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