Yamaha MCX-1000 Service Manual page 73

A B
SCHEMATIC DIAGRAM (OPERATION 3/3)
1
POWER
SUPPLY
2
AC 11.9
3
AC 17.6
4
AC 3.9
5
6
IC400: NJM79L05A-T3
Voltage Regulator
COMMON
1
7
2
OUTPUT
3 INPUT
8
All voltages are measured with a 10MΩ/V DC electronic voltmeter.
Components having special characteristics are marked s and
must be replaced with parts having specifications equal to those
originally installed.
Schematic diagram is subject to change without notice.
9
C D E
2.3
0
4.9
2.2
AC 5.5
5.6 11.8
5.6 10.6
0 12.5
0
0
5.5
-0.8
0
4.1
AC 11.3
0
AC 19.3
4.2
AC 8.7
REGULATOR
4.8
0 12.8
4.8
5.2
0
VOLTAGE
REGULATOR
10.6
0 24.6
10.1 12.1
0
-29.9
-19.5 -24.2
-29.9 -28.5
-29.2
-9.9
-29.2
-19.5
0
0
0
-9.9
-18.4 -5.0
-18.4 -5.0
VOLTAGE REGULATOR
F G
VOLTAGE
REGULATOR
2.1
9.2
5.0
VOLTAGE
REGULATOR
5.0
9.2
VOLTAGE
6.8
6.7
0
0
6.7
6.7
0
0
10.1
10.7
4.9 9.6 12.4
9.6
4.9 9.6
5.3 5.2 5.2 -5.0
5.0
5.3
-28.5
0 5.3 5.2
-22.6
H I
22.3
IC405: M5237ML
Regulator
INPUT 1
ASO
Protection
Starter
Circuit
Sudden Current
Protection
Overheat
Protection
– 3 OUTPUT
Standard Amp.
+
Voltage
2
GND
22.3
IC401~403 : PQ1CG2032FZ
Voltage Regulator
V 1 2 V
IN OUT
Voltage ON/OFF
regulator circuit
PWM COMP.
5 ON/OFF
+
–
Soft
start
Q
F/F R Oscillator
Over current
S
protection
circuit
ERROR AMP.
– 4 Oadj
+
V
Over heat REF
protection
22.3
circuit
3
COM
IC404: PQ05RD11
Voltage Regulator
Vin 1 2 Vo
4 Vc
3
GND
22.3
24.3
24.3 9.6
0
21.6
24.3
4.9
4.9
23.9 4.9
0
VOLTAGE
REGULATOR
0
4.8
0
J K L
MCX-1000
OPERATION (5)
73