A
B
C
D
E
G
H
1
2
3
4
5
6
I
J
K
7
8
DVR-S120/NX-P120
79
■
DVR-S120 SCHEMATIC DIAGRAM (SUB)
3.9
0
0
0
0
0
0
0
0
0
0
0
0
0
4.9
4.9
4.9
4.9
4.9
3.9
4.9
4.9
3.6
3.6
5.0
1.3
0
0
12.0
20.7
3.6
4.9
12.0
20.7
20.7
20.9
13.5
11.8
5.0
5.0
-12.2
-12.2
-12.0
-21.7
-21.2
5.0
4.8
6.7
6.2
5.0
5.7
7.0
12.5
12.5
11.8
4.8
12.5
10.8
3.7
5.7
20.9
-0.1
-21.0
5.5
12.8
5.0
1.3
0
0
5.0
5.0
12.8
4.9
5.0
0
3.7
3.6
12.7
7.9
3.6
6.3
6.3
0.7
7.9
6.2
0
0
0
0
0
0
0
0
0
0
0
-21.0
-14.2
-5.1
0
0
0
0
0
0
11.8
0
0
-0.1
-0.1
A
C7.9
AC4.9
AC10.4
AC32.6
4
1
8
12
7
13
12
14
3
2
7
6
8
1
2
3
4
6
5
9
10
5
PHONES
(1)
(1)
L275-278
C362
C361
BLM21P600SG
X : NOT USED
* 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.
Point
e
CH 1 : Emitter of Q272
CH 2 : Colector of Q271
CH 2
CH 1
↑
AC POWER ON
(Connect the power cable)
↑
AC POWER OFF
(Disconnect the power cable)
IC275 : PQ1CG21H2F
IC276 : PQ1CG2032FZ
Voltage Regulator
V IN
COM
ON/OFF
O ADJ
V OUT
OVER CURRENT
PROTECTION
CIRCUIT
OVER HEAT
PROTECTION
CIRCUIT
SOFT
START
PWM
COMP.
VOLTAGE
REGULATOR
ON/OFF
CIRCUIT
ERROR
AMP.
S
R
F/F
OSCILLATOR
VREF
1
3
4
5
2
Q
IC311 : NJM2904M
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
IC312 : TC74HCT00AF
Quad 2 Input NAND
A1
B1
A2
V
DD
B4
1
2
3
4
11
Y1
A4
Y4
12
13
14
B2
Y2
B3
A3
5
6
7
V
SS
Y3
8
9
10
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
