Sw-P270 Schematic Diagram - Yamaha NS-P270 Service Manual

A B
NS-P270/NS-P276
I

SW-P270 SCHEMATIC DIAGRAM

1
11.7
0
0
0
-11.0
2
0
INPUT
0
0
3
4
5
10
6
C
11.7
0
0
0
-11.0
VOLUME
0
0
0
0 -1.0
POWER INDICATOR
MAIN (2)
U, C, A, B, G models
-31.6
0
R, T, K, L models
-33.0 32.9
AC48.9 V
MAIN (3)
POWER
D E
IC1, 2, 7 : KIA4558P IC4 : STK404-050
Dual OP-Amp Power Amp
OUT 1 1 8 +V CC
TR6
R1
R4
–IN 2 7 OUT
1 2
+ – + –
TR1 TR2
R5
+IN 3 6 –IN
1 2
C2
C1
–V CC 4 5 +IN 2
R2
TR5
D1
TR3 R3 R6
TR4
SUB
1 1 2 3 4 5 6 7
11.7
0
0
0 0
0
0
0
0 0
0
0
0
-11.6
31.3 11.7
+12.3
0.8
1.3
12.3
0.1 0.8
0.1
0.8
1.3
0.1
-12.2
0.1
-12.2
-31.5 -11.6
* All voltages are measured with a 10M Ω /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.
F
MAIN (1)
TR7
TR8
1.9
8 9 10
1.3
11.7
1.3
32.9
0.2
-33.0
-1.1
-32.0
0.2
0 0 0.1
0
0
0.1 0.1
0.1
0.1 0.1
0.1
0.1
1.3 1.3
-9.9
0.3
0.1 0.1
G H
DRIVER
0.1
0.1
-1.5
0
0.1
-11.7
11.7
0.1 0.1