Sharp SF-A18, Руководство по обслуживанию, Страница: 33 / 70

[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).
[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.
[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).
77
P26
CPU
(IC11)
VCC
VOUT
GND
TLP1240(C5)
173981-6
Paper exit
sensor DES
Paper exit sensor input circuit
+5V CN7-4
DES
CN7-6
GND
CN7-5
+5V
C15
0.010µ F
6 5
R25
10K
IC4-3
TC74HC14AF
R102
180
R117
15K
74
P23/INTP2/CI
CPU
(IC11)
VCC
VOUT
GND
TLP1225(C5)
173981-9
Paper feed motor
rotation sensor
DFMRS
Constant-voltage
power source
Paper feed motor rotation sensor input circuit
CN2-6
DFMRS
CN2-5
GND CN2-4
+5v
10 11
IC4-5
TC74HC14AF
C24
3300PF
R55
4.7K
+5V
+5V
TP13
R56
4.7K
VCC
VOUT
GND
GP1A22HR
+5V
CN1-10
DED CN1-12
GND CN1-11
C23
0.010µ F
R38
10K
+5V
R76
1.0M
R43
10K
VCC
VOUT
GND
+5V CN1-7
DLS2 CN1-9
GND
CN1-8 C18
0.010µ F
R36
10K
+5V
+5V
R65
4.7K
R22
10K
VCC
VOUT
GND
GP1A25LC
GP1A25LC
C13
0.010µ F
R60
4.7K
59
62
63
78
CPU
(IC11)
P73/ANI3
P76/ANI6
P77/ANI7
P27/SI
1-173981-2
1-173981-2
1-173981-2
1-173981-2
TP38
Original width
volume DWVR
Original length
sensor 1 DLS1
Original length
sensor 2 DLS2
Original end
sensor DED
Tray original size sensor circuit
+5V CN1-4
DLS1 CN1-6
GND CN1-5
C17
0.010µ F
R35
10K
+5V
CN1-1
DWR CN1-2
GND CN1-3
R71
4.7K
+5V
+5V
R21
10K
Constant-voltage
power source
Constant-voltage
power source
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