Original Size Detection - Toshiba e-STUDIO555 Service Manual

15.3.3

Original size detection

The original tray width sensor, original registration sensor, and original width detection sensors-1, -2
and -3 work in combination to detect the size of originals.
[ 1 ] Outline
When an original is placed on the original tray, the width of the original is detected by the positions of
the original width guides. Then the original width detection sensors -1, -2 and -3 and the original
registration sensor detect the size of the original being transported. Based on the detection result of
these sensors, the size of the original is finally determined.
[ 2 ] Original tray width sensor
The original tray width sensor detects the width of an original placed on the original tray.
It is detected by the brush attached to the rack moving on the original tray width sensor, which is a
board with the different length of the patterns written.
This brush is moved as the original width guide is moved. Signals (TWID0S, TWID1S, TWID2S) are
opened and shorted to SG by this movement.
The combination of these short (= low level) and open (= high level) can determine the width of the
original.
Sizes detectable in combination of these open and short of the signals are as follows:
TWID2S TWID1S
H H
H L
H L
L H
L L
H (= high level): Open
[ 3 ] Original width detection sensors-1, -2 and -3 / Original registration sensor
The size of the original is determined by the detection performed in combination of the original width
detection sensors-1, -2 and -3 and the original registration sensor, as well as the detection performed
by the original tray width sensor.
Sizes detectable in combination of these sensors are as follows:
A4series: (08-201: 0 or 2)
Original tray Original tray
width sensor sensor
- -
- -
B5/B4 -
- ON
A4/A3 OFF
- -
- -
- -
- -
- -
© 2009 - 2011 TOSHIBA TEC CORPORATION All rights reserved
Original width size
TWID0S
(LT series)
L
H ST-R
L LD / LT
L 8.5x8.5 / LT-R / LG / 13"LG
L COMPUTER
L (= low level): Short
Original
Original
width
registration
detection
sensor
sensor-1
ON
ON
ON
ON
OFF
ON
ON
OFF
ON
OFF
15 - 5
Original width size
-
A4-R / FOLIO
Original Original
width width
detection detection
sensor-2 sensor-3
ON ON
ON OFF
OFF OFF
OFF OFF
ON ON
ON OFF
OFF OFF
OFF OFF
REVERSING AUTOMATIC DOCUMENT FEEDER (RADF)
(A4 series)
B5-R
A5-R
A3 / A4
B4 / B5
Size
determined
A3
LD
B4
FOLIO
A4-R
B5-R
A4
LT
B5
A5-R
e-STUDIO555/655/755/855
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