Yamaha DVR-S200, Service Manual

Page: 88 / 108

A B C D E F G H
1
2
3
4
5
6
I J K L
7
8
DVR-S200/NX-P200
88
■
NX-SW200 SCHEMATIC DIAGRAM
* 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.
IC2, 4, 5 :
µ
PC4570HA
Dual OP-Amp
IC3 : TA7317P
Protector
1
6
2
3
8
7 4
9
Muting
circuit
Constant voltage
power supply circuit
Schmidt
circuit
Power supply
ON/OFF
detecting circuit
Discharging
circuit
5
Substrate
Overcurrent
detecting circuit
OR circuit
Current voltage
detecting circuit
GND
Relay drive
circuit
IC1 : STK404-120
Power Amp
POWER AMP
PROTECTION
POWER SUPPLY
A.N.I.C.
LIMITTER
H.P.F.
L.P.F.
BUFFER
0
0 0
-14.9
0
0 0
14.7
0
0 0
14.7
0
0
0
0
0
0
0
0 0
0.2 0.2
0
-52.8
14.8
1.1
1.8
-53.2 53.2
0 0
1.1
0 0 0
1.1
0
1.3 3.1
0
0
0
0
1.1
25.4
14.7
-15.0
-49.1
-15.4
15.2
0
0
0 0
0
0
0
14.7
14.1
14.1
0
0
0
0
0
0
-23.7
0
48.6
53.2 -53.5
-15.0
0
0 0
0
0
0
0
0
0 0
0
14.7
0
0
-0.4
-1.9
0
0
0
53.1
53.1
53.1
-0.7
0
0
0
-15.0
0
14.8
-14.9
AC78.9
INPUT
SYSTEM
CONNECTOR
EUROPE
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
2
3
6 7 10
9
12
11
8
1
4 5
BIAS
PRE
DRIVER
POWER
STAGE
SUB
+
–