Yamaha KMA-1000 Service Manual page 50

A B C
KMA-1000/KMA-950
MAIN 2/2
1
2
3
17.9
17.9
4
-16.1
IC552
-16.1
9.4
5
W551
9.4
0 0
6
7
8
9
IC551: NJM7812FA
Voltage regulator
INPUT
10
OUTPUT
COMMON
50
D E F
KMA-950
12.3
+12V
IC551
REGULATOR
12.3
-11.6
-12V
REGULATOR
-11.6
W552
5.1
+5V
REGULATOR
IC553
5.1
IC552: KIA7912PI
Voltage regulator
1 COMMON (GND)
R22
R15 R18 R21 R23
Q28 Q17 Q21
Q22 Q24
R16 R13 R12
Q23
R24
Q19
Q29
R20
R1
Q18 Q20
Q25
Q30
R14 Q31
R17 R25
R19
Q12 Q13
Q2 Q3 Q26-1 R11
R10
R26 3 OUTPUT
Q 6 2 Q 7 2
Q27-1
Q7
D4 Q14
Q15
R0 C2 C1
Q16
Q8 R9
R4 R5 R6
Q4 Q6 Q9 Q11
R3
Q5 Q10
R8
R2
R7
2 INPUT
G H
IC553: NJM78M05DL1A
Voltage regulator
IN
OUT
GND
I J K L M N
* All voltages are measured with a 10MΩ/V DC electronic volt meter.
* Components having special characteristics are marked Z and must be replaced
with parts having specifications equal to those originally installed.
* Schematic diagram is subject to change without notice.
O