Sharp SF-2052 Serviceanleitung Seite 225

[d] 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
[e] 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 three photo interrupters (DLS1, DLS2, DLS3).
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, DSL2, and DSL3 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
DSL3: IC11 78 pin
Original width
volume DWVR
Original length
sensor 1 DLS1
Original length
sensor 2 DLS2
Original length
sensor 3 DLS3
[f] Original set sensor (DSS)
The DSS uses a photo interrupter which is integrated with a light emitting diode and a photo transistor. The signal is passed through the noise filter
composed of R23, C16, and Schmidt trigger invertor (IC4) to the gate array (IC7 53 pin), then passed through the data bus to the CPU.
Original set
sensor (DSS)
TLP1225(C5)
1
Constant voltage
VCC
power
2
VOUT
3
GND
Paper feed motor rotation sensor input circuit
GP1A25LC
1
Constant voltage
VCC
power
2
VOUT
3
GND
GP1A25LC
1
Constant voltage
VCC
power
2
VOUT
3
GND
TLP1225(C5)
1
Constant voltage
VCC
power
2
VOUT
3
GND
Tray original size sensor circuit
TLP1240(C5)
1
VCC
2
VOUT
3
GND
Original set sensor input circuit
+5V
+5V
R56
173981-9
6
4.7K
CN2-6 +5v
5
CN2-5 DFMRS
4
4.7K
CN2-4 SGND
1-173981-2
+5V
1
+5V
CN1-1
2
CN1-2 DWVR
3
GND
CN1-3
+5V
1-173981-2
4
CN1-4 +5V
6
CN1-6 DLS1
5
GND
CN1-5
+5V
1-173981-2
7
+5V
CN1-7
9
CN1-9 DLS2
+5V
8
GND
CN1-8
+5V
1-173981-2
10
CN1-10 +5V
12
CN1-12 DLS3
11
GND
CN1-11
R101
180
173981-9
1
CN2-1 +5V
3
CN2-3 DWS
2
SGND
CN2-2
12 – 22
TP13
IC4-5
R55
11 10
TC74HC14AF
C24
3300PF
R60
4.7K
C13
0.010µ F
R71
4.7K
R35
R21
10K
10K
C17
0.010µ F
R65
4.7K
R22 R36
10K
10K
C18
0.010µ F
R76
4.7K
R43 R38
10K
10K
C23
0.010µ F
R115
15K
IC4-4
R23
9 8
10K
C16
TC74HC14AF
0.010µ F
CPU
(IC11)
74 P23/INTP2/CI
CPU
TP13
(IC11)
59
P73/ANI3
62
P76/ANI6
63
P77/ANI7
78
P27/SI
G/A
(IC7)
53
P0