JVC KD-SX979R Service Manual page 22

LA4743B (IC301) :Power amp
1.Terminal layout
1 2 3 4 5 6 7 8
2.Block diagram
IN 1
TAB
IN 2
ST BY
R.F
IN 3
N.C
PRE GND
IN 4
ON TIME
9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25
VCC1/2
6
11
+
-
1
Protective
circuit
-
12
+
4
Stand by
switch
Ripple
10
filter
15
+
-
25
Protective
circuit
13
-
14
+
Muting &
16
on time control
circuit
VCC3/4
20
9
+ OUT 1+
7 OUT 1-
-
8
PWR GND1
OUT 2+
5
+
- 3 OUT 2-
2
PWR GND2
Mute
22
MUTE
circuit
17
OUT 3+
+
- 19 OUT 3-
18
PWR GND3
+
21 OUT 4+
-
23
OUT 4-
24
PWR GND4
KD-SX979R/KD-SX925R
KD-SX924R/KD-SX909R
2-19