Sharp AR-810 (serv.man10) Service Manual ▷ View online
AR-651/810 SCANNING SECTION 6 - 13
(4) Original size is determined by the combination of the presence/absence of signals which are output at
each detection point. The combination chart for size determination of A4 series and LT series are as
followed.
[A4 Series]
Size
APS-1
APS-2
APS-3
APS-4
APS-5
A3
0
0
0
0
0
A4
0
0
0
0
1
B4
0
0
0
1
0
B5
1
0
0
1
1
A4-R
0
0
1
1
0
A5
1
0
1
1
1
B5-R
0
1
1
1
0
A5-R
0
1
1
1
1
[LT Series]
Size
APS-2
APS-3
APS-4
APS-5
LD
0
0
0
0
LT
0
0
0
1
LG
0
0
1
0
LT-R
0
0
1
1
ST
1
0
1
1
ST-R
0
1
1
1
Code
Output signal
Original
1
H
Absent
0
L
Present
* When the APS operation sensor is OFF;
• The following points are determined by the output signals from APS sensors
Size (The combination of the signals satisfy the above chart)
: Size is displayed on the control panel and an appropriate paper and reproduction ratio are selected.
Size retention (The combination of the signals do not satisfy the above chart)
: Retains the latest original size recognized (or no original state) until a new paper size is recognized.
No original (output from all the sensors are “1”.)
: Reproduction ratio and paper size are not selected.
• Size change is always observed and detected.
• Carriage-1 stays at the standby position even if the reproduction ratio changes corresponding to the change of
• Carriage-1 stays at the standby position even if the reproduction ratio changes corresponding to the change of
the original size.
* When the APS operation sensor is ON;
Retains the latest original size (or no original state) recognized right before the APS operation sensor is turned
ON regardless of the state of the APS sensor output signals.
ON regardless of the state of the APS sensor output signals.
AR-651/810 SCANNING SECTION 6 - 14
The reflection type photosensor is comprised of an infrared light emitting diode and a phototransistor. It
uses the pulse modulation to detect an original.
The light emitting diode is driven by a pulse having a 130-µsec cycle and an 8-µsec ON time. When the
phototransistor receives the same signal as this pulse, it is determined that there is an original. The
pulse modulation is performed inside the reflection type phototransistor.
About reflection type photosensor
130µsec
LED
8µsec
Original
Phototransistor
AR-651/810 SCANNING SECTION 6 - 14
The reflection type photosensor is comprised of an infrared light emitting diode and a phototransistor. It
uses the pulse modulation to detect an original.
The light emitting diode is driven by a pulse having a 130-µsec cycle and an 8-µsec ON time. When the
phototransistor receives the same signal as this pulse, it is determined that there is an original. The
pulse modulation is performed inside the reflection type phototransistor.
About reflection type photosensor
130µsec
LED
8µsec
Original
Phototransistor
AR-651/810 SCANNING SECTION 6 - 14
The reflection type photosensor is comprised of an infrared light emitting diode and a phototransistor. It
uses the pulse modulation to detect an original.
The light emitting diode is driven by a pulse having a 130-µsec cycle and an 8-µsec ON time. When the
phototransistor receives the same signal as this pulse, it is determined that there is an original. The
pulse modulation is performed inside the reflection type phototransistor.
About reflection type photosensor
130µsec
LED
8µsec
Original
Phototransistor
