Yamaha NS-P320, Service Manual

Page: 9 / 15

A B C D E F G H
1
2
3
4
5
6
I J K
7
8
NS-P320
■
SW-P201 SCHEMATIC DIAGRAM
* All voltage are measured with a 10M
Ω
/V DC electric 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.
BA4558N
µ
PC1237HA
M51848L
µ
PC4570HA
1
9
1SS133
1SR139-400
MTZJ12C
MTZJ15C
MTZJ24B
Anode
Cathode B
C
E
2SA1015 (Y)
2SC1815 (Y)
2SC2240 (GR, BL) RBV-402
D
G
S
2SK304 (E, T) STK404-050
PIN CONNECTION DIAGRAM OF TRANSISTORS, DIODES AND ICS.
E-8/J-6
POWER AMP
LIMITER
AUTO POWER ON/OFF CIRCUIT
PROTECTION
0
0
-14.3
0
14.3
0
0
0
0
0
0.6
1.9
0
0
9.1
9.8
10.4
11.1
0
0
0
0.1
-0.1
0.1
-0.1
14.3
-14.3
0
0
0 0
0 0
0
0
0 0
0
0
14.1
-14.1
0.5
0.5
0.1 0
0 0.1
14.1
14.3
0
0
0
0
14.3
-14.3
0
0
-1.5
0
5.5
9.8
11.0
9.7
5.5
0
11.0
1.4
0
0
10.9
9.7
9.1
0.8
26.9
0
0
0
14.3
0
0 0
14.3
-14.3
0
30.9
0
-31.2
30.9 14.2
14.8
-31.1 -14.2
-14.8
0
29.5
29.9
29.9
4.0
0
0.1
0.7
AC49.0
0
12.1
29.9 11.6
11.7
12.2
3.5 2.2 0.8
0
2.9
0 0 0
0
1.4 9.7
11.0
7.4
10.9 10.9 11.0
0.1 0.1
0
-30.9
14.3
1.2
-1.2
-31.4
30.9
0
1.9
WH
RE
GR
WH
RE
BR
BE
BE
WH
R MODEL
BE
BE
BE
WH WH
WH
BE
+
–
B
CE
2SB1565 (EF)
2SD2394 (DEF)
1
8
1
8
1
1 0
V
O1
2
–Vm
1
3
+Vm
1
4
V
EE
5
+Vm
2
6
–Vm
2
7
V
O2
8
V
CC
9
V
CC
1
1
– + – +
2
IC2, 3, 7, 8 :
µ
PC4570HA
Dual OP-Amp
IC6 : M51848L
CR Timer
IC1 : BA4558N
Dual OP-Amp
–
IN
1
2
+IN
1
3
–
V
CC
4
+IN
2
5
–
IN
2
6
OUT
2
7
+V
CC
8
OUT
1
1
–
+
–
+
IC4 : STK404-050
AF Power Amp
IC5 :
µ
PC1237HA
Protector IC for Power Amplifier
1
2
5 3 4
7 8
6
Overload
detect
Mid-point
potential
detect
Flip flop
circuit
Vcc on
mute
AC OFF
detect
Latch / automatic
return select
Relay
drive
circuit
GND
Vcc
GND
6 4 1 2 3
TRIGGER
OUT
RESET
REFERENCE
VOL
T
AGE
THRESHOLD
DISCHARGE
VCC
7 8
+
–
FLIP-
FLOP
+
–
5
R R R
1 2 3 4 5 6 7 8 9 10
R1
R4
R5
C1
C2
D1 TR3
TR5
R3 R6
TR4
SUB
R2
TR1 TR2
TR6
TR7
TR8