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[d] Paper exit sensor (DES) --- SF-A18 only
The DES uses a photo interrupter which is integrated with the light emitting diode and the photo transistor.
When there is an original, the lever-type actuator interrupts the optical path. The signal is passed the noise filter composed of R25, C15 and
Schmidt trigger invertor (IC4) to the CPU (IC11 77 pin).
Paper exit
sensor DES
[e] Paper feed motor rotation sensor (DFMRS)
This sensor senses rotation of the paper feed motor, and is composed of the photo interrupter built in the amplifier and the slit disc attached to the
motor shaft. The pulse signals corresponding to the motor speed are obtained. the motor rotation speed is sensed from the frequency of the pulse
signals, and the motor rotation amount is sensed by counting the pulse numbers.
The input section of signals is a noise filter composed of R55, C24, and Schmidt trigger invertor, which processes signals.
Paper feed motor
rotation sensor
DFMRS
[f] Tray original size sensor, volume circuit
This circuit senses the original size on the tray, and its sensor section is built in the tray.
The original width is sensed by the slide volume (DWVR), and the original length is sensed by the two photo interrupters (DLS1, DLS2). (Only DSL1
for AB series)
The DWVR varies the resistance of the variable resistor with the lever attached to the original guide, and the variation is sensed as the voltage
value.
The signal is analog-inputted to the CPU A-D input pin (IC11 59 pin). On the other hand, DSL1 and DSL2 use the photo interrupter which is
integrated with the light emitting diode and the photo transistor. When there is an original, the lever-type actuator interrupts the optical path. The
signal is inputted through the noise filter to the CPU.
DSL1: IC11 62 pin
DSL2: IC11 63 pin
The original end sensor (DED) which senses the third original also uses a photo interrupter, and the signal is inputted through the noise filter to the
CPU (IC11 78 pin).
Original width
volume DWVR
Original length
sensor 1 DLS1
Original length
sensor 2 DLS2
Original end
sensor DED
TLP1240(C5)
173981-6
VCC
CN7-4
VOUT
CN7-6
GND
CN7-5
Paper exit sensor input circuit
TLP1225(C5)
Constant-voltage
power source
VCC
CN2-6
VOUT
CN2-5
GND
CN2-4
Paper feed motor rotation sensor input circuit
1-173981-2
CN1-1
CN1-2
CN1-3
GP1A25LC
1-173981-2
VCC
CN1-4
VOUT
CN1-6
GND
CN1-5
GP1A25LC
1-173981-2
Constant-voltage
VCC
CN1-7
power source
VOUT
CN1-9
GND
CN1-8
GP1A22HR
1-173981-2
Constant-voltage
VCC
CN1-10
power source
VOUT
CN1-12
GND
CN1-11
Tray original size sensor circuit
+5V
R102
180
R117
15K
+5V
R25
DES
10K
GND
+5V
+5V
R56
173981-9
4.7K
+5v
R55
DFMRS
4.7K
GND
+5V
+5V
DWR
GND
+5V
R71
4.7K
+5V
R21
DLS1
10K
GND
+5V
R65
4.7K
+5V
R22
DLS2
+5V
10K
GND
+5V
R76
1.0M
+5V
R43
DED
10K
GND
– 32 –
CPU
(IC11)
IC4-3
5
6
77
P26
TC74HC14AF
C15
0.010µ F
CPU
TP13
(IC11)
IC4-5
11
10
74 P23/INTP2/CI
TC74HC14AF
C24
3300PF
CPU
TP38
(IC11)
R60
59
P73/ANI3
4.7K
C13
0.010µ F
R35
62
P76/ANI6
10K
C17
0.010µ F
R36
63
P77/ANI7
10K
C18
0.010µ F
R38
78
P27/SI
10K
C23
0.010µ F
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