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2. Power circuit (Power supply circuit)
2-1. Abstract and Pin Function
The SMPS(Switch Mode Power Supply) can supply a stable output voltage to each circuit, provided that the input voltage
is within the range of between 108-132 VAC at 60HZ.
Regulation is accomplished by PWM(Pulse Width Modulation) of IC STR-S5707.
The table below identifies the various output volatges:
NO.SUPPLY ELECTRIC
RESOURCES
1
DC 125V
DC 12V
2
(MOTOR 12V)
DC 12V
3
(ON/OFF 12V)
DC 6.0V
4
(EVER 5.3V)
5
DC 14V
6
DC 9V
2-2. I801 STRS-5707
1) BLOCK DIAGRAM
SENS
7
PNP
+2D
R6
R7
R8
R9
SOURCE
TRANS SECOND RECTIFIED
VOLTAGE
D814
REGULATOR IC
I805(PQ12RF11)
REGULATOR IC
I804(PQ12RF11)
REGULATOR IC
I803(KIA7806)
TRANS SECOND
RECTIFIED VOLTAGE
D813
REGULATOR IC
I806 (KIA7809)
VIN
9
OVP
START UP
PRB RBG
R1
T.S.D
C1
SUPPLY CIRCUIT
FBT
PIF
SERVO circuit
TUNER
IF AMP circuit
AUDIO circuit
VIDEO circuit
SERVO, TIMER IC
SYSCON IC circuit
AUDIO circuit
DEFLECTION circuit
LA TCH
PROPORTIONAL
OSC
OCP
C2
C4
R2
39
APPLICATION
+
FBT B
For channel
selecting(33V)
For driving DRUM,
CAPSTAN MOTOR
For channel selecting(9V, 5V)
IF amp. circuit(9V), V/SIF(5V)
For driving AUDIO I/O circuit
For driving VIDEO, ANALOG circuit
For driving SYSCON, TIMER,
SERVO circuit
AUDIO AMP. B
VERTICAL IC B
H. VCC
Tr2
DRIVE
R3
Trl
R4
C3
R5
6
INH
+
+
DRIVD
8
4
SINK
3
B
1
C
GND
2
5
OCP
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