A
B
C
D
E
G
H
1
2
3
4
5
6
I
J
K
L
7
8
DVR-S120/NX-P120
80
■
NX-SW120 SCHEMATIC DIAGRAM
POWER AMP
PROTECTION
LIMITTER
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0.2
-0.7
-0.7
1.1
1.4
3.1
0
0
0
0
0.2
0
0
-33.9
11.6
1.2
-1.2
-34.4
34.3
0.5
11.0
11.6
34.2
-34.4
0.6
11.6
34.2
11.6
-11.6
-11.6
0
0
0
0
0
0
0
11.6
-11.6
AC25.2
AC25.2
MAIN (2)
MAIN (1)
* 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.
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
IC4 : STK404-050
Power Amp
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
IC1, 2, 7 : KIA4558P
Dual OP-Amp
–
+
OUT
1
–IN
1
–V
CC
+V
CC
OUT
2
1
2
3
4
5
+IN
1
–IN
2
+IN
2
–
+
6
7
8
w w w
.
x i a o y
u 1 6 3 .
c o m
Q Q
3 7 6 3 1 5 1 5 0
9
9
2
8
9
4
2
9
8
T E L
1 3 9 4 2 2 9 6 5 1 3
9
9
2
8
9
4
2
9
8
0
5
1
5
1
3
6
7
3
Q
Q
TEL 13942296513 QQ 376315150 892498299
TEL 13942296513 QQ 376315150 892498299
