Toshiba DP-5550, Service Manual, Page: 323 / 404

15
© 2009 - 2011 TOSHIBA TEC CORPORATION All rights reserved e-STUDIO555/655/755/855
REVERSING AUTOMATIC DOCUMENT FEEDER (RADF)
15 - 5
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:
H (= high level): Open L (= low level): Short
[ 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)
TWID2S TWID1S TWID0S
Original width size
(LT series)
Original width size
(A4 series)
H H L - B5-R
H L H ST-R A5-R
H L L LD / LT A3 / A4
L H L 8.5x8.5 / LT-R / LG / 13”LG A4-R / FOLIO
L L L COMPUTER B4 / B5
Original tray
width sensor
Original tray
sensor
Original
registration
sensor
Original
width
detection
sensor-1
Original
width
detection
sensor-2
Original
width
detection
sensor-3
Size
determined
- -
ON
ON ON ON A3
- - ON ON OFF LD
B5/B4 -
ON OFF OFF
B4
- ON FOLIO
A4/A3 OFF A4-R
- - OFF OFF OFF B5-R
- -
OFF
ON ON ON A4
- - ON ON OFF LT
- - ON OFF OFF B5
- - OFF OFF OFF A5-R