Yamaha DVX-S120 Service Manual page 79

A B
DVR-S120 SCHEMATIC DIAGRAM (SUB)
1 Q Q
3 7 6 3 1 5 1 5 0
3.9
0
4.9
7
0
2
0
4.9
4
4.9
1
0
4.9
3
4
Page 77
A5
to MAIN (1)
T E
L 1 3 9 4 2 2 9 6 5 1 3
Page 76
J7
-12.0
to MAIN (2)
5
5.0
-21.2
6
Page 78
D1
to MAIN (3)
7
3
CH2
4.8
0
w w w
0
0
8
.
0
C D E
3.9 1 3 4 4.9
6
0
2 5
6 9
0
5 8
0
4.9 10
3.6
0
7
0 0 0
2 3.6
0
13
12 0
3 4.9
3.6
8 12
14
4.9
11.8
11.8 20.9
0
0
0
-12.2 -21.0
-12.2
-21.7
5.0
5.0 13.5
0
0
0
-5.1 -14.2
BLM21P600SG
3
CH1
12.5
12.5
7.0
4.8
11.8
6.2
6.7
5.0
5.7 7.9
6.3 0
6.3
0.7
6.2 x a o
y
i
0 0
0
http://www.xiaoyu163.com F G
IC311 : NJM2904M IC312 : TC74HCT00AF
Dual OP-Amp Quad 2 Input NAND
8
A1 1 14 V DD
OUT 1 1 8 +V CC
–IN 2 7 OUT B1 2 13 B4
1 2
+ – + –
3
+IN 1 6 –IN 2 Y1 3 12 A4
–V CC 4 5 +IN 2
A2 4 11 Y4
B2 5 10 B3
Y2 6 9 A3
V 7 8 Y3
SS
IC275 : PQ1CG21H2F
IC276 : PQ1CG2032FZ
Voltage Regulator
V IN 1 2 V OUT
VOLTAGE ON/OFF
REGULATOR CIRCUIT
Page 77
PWM 5 ON/OFF
COMP.
E1
SOFT
START
OVER CURRENT Q
to MAIN (1) PROTECTION F/F R OSCILLATOR
CIRCUIT
4 O ADJ
S
ERROR
AMP.
VREF
OVER HEAT
PROTECTION
CIRCUIT
3
COM
Page 76
0
0
J5
to MAIN (2)
-0.1
20.7
-0.1
20.7
Q Q
3 7 6 3
-21.0
20.9
-0.1
AC32.6
AC10.4
5.7
AC4.9
12.8 0
5.5
12.5
3.7
7.9
12.7 3.7
3.6 3.6
0
10.8
u 1 6 3
0
.
http://www.xiaoyu163.com
H I
2 4
9 9
Page 78
I3
to MAIN (3)
Page 74
B1
1 5 1 5 0 8 9 2
to DVD M5
Page 77 J4
to MAIN (1)
m
X : NOT USED
c o
J K
DVR-S120/NX-P120
2
8 9 9
Point e
CH 1 : Emitter of Q272
CH 2 : Colector of Q271
CH 1
CH 2
↑ ↑
PHONES
AC POWER ON AC POWER OFF
(Disconnect the power cable)
(Connect the power cable)
4 9 8 2 9 9
L275-278
* 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.
79