JVC KD-SX985 Service Manual page 40

KD-SX985
QQ
3 7 63 1515 0
LA47503 (IC301) : Power amp
1. Pin layout
1 25
3.Pin function
Pin No. Symbol
1
AC CONT1
2
GND1
3
OUTFR-
4
STBY
5
OUTFR+
6
Vcc1/2
TE
L 13942296513
7
OUTRR-
8
GND2
9
OUTRR+
10
VREF
11
INRR
12
INFR
13
SGND
14
INFL
15
INRL
16
ONTIME
17
OUTRL+
18
GND3
19
OUTRL-
20
Vcc3/4
21
OUTFL+
22
MUTE
23
OUTFL-
24
GND4
25
NC
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2. Block diagram
9 7 8 5
20
6
11 1
Function
Header of IC
Power GND
Outpur(-) for front Rch
Stand by input
Output (+) for front Rch
Power input
Output (-) for rear Rch
Power GND
Output (+) for rear Rch
Ripple filter
Rear Rch input
Front Rch input
Signal GND
Front Lch input
Rear Lch input
Power on time control
Output (+) for rear Lch
Power GND
Output (-) for rear Lch
Power input
Output (+) for front
Muting control input
Output (-) for front
Power GND
No connection
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8
3 2 22 17
Mute
circuit
Ripple
filter
Stand by
switch
12 4 10 15
Q Q
3 6 7 1 3
u163
.
2 9 9 4 2 8
19 18 21 23 24
Muting &
ON Time control
Circuit
25 13 14 16
1 5 0 5 8 2 9
m
co
9 9
9 4 2 8 9 9