JVC KS-LX200R service manual LA4743B IC941 Power amp

KS-LX200R

LA4743B (IC941) :Power amp

1.Terminal layout

TAB	GND1	OUTFR+	STBY	OUTFR-	VCC1/2	OUTRR+	GND2	OUTRR-	VREF INRR INFR SGND INFR INRL ONTIME OUTRL+ GND3 OUTRL- VCC3/4 OUTFL+ MUTE OUTFL- GND4 NC
1	2	3	4	5	6	7	8	9	10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25

		2.Block diagram
		1+	1-
		OUT	OUT
		9	7
VCC3/4	20	+	-
VCC1/2	6	+	-

11	1
IN 1	TAB

3.Pin function

PWR GND1	OUT 2+	OUT 2-	PWR GND2		MUTE	OUT 3+	OUT 3-	PWR GND3	OUT 4+	OUT 4-	PWR GND4
8	5	3	2		22	17	19	18	21	23	24
Protective circuit	- +	+ -		Mute	circuit	+ +	- -	Protective circuit	- +	+ -

Stand by switch Ripple filter Muting & on time control circuit

12	4	10	15	25	13	14	16
IN 2	ST BY	R.F	IN 3	N.C	PRE GND	IN 4	ON TIME

Pin	Symbol	Function	Pin	Symbol	Function
No.			No.
1	TAB	Header of IC	14	LFIN	Front Lch input
2	GND1	Power GND	15	LRIN	Rear Lch input
3	RFO-	Output (-) for front Rch	16	ONTIME	Power on time control
4	STBY	Stand by input	17	LRO+	Output (+) for rear Lch
5	RFO+	Output (+) for front Rch	18	GND3	Power GND
6	VCC1/2	Power input	19	LRO-	Output (-) for rear Lch
7	RRO-	Output (-) for rear Rch	20	VCC3/4	Power input
8	GND2	Power GND	21	LFO+	Output (+) for front
9	RRO+	Output (+) for rear Rch	22	MUTE	Muting control input
10	R.F	Ripple filter	23	LFO-	Output (-) for front
11	RRIN	Rear Rch input	24	GND4	Power GND
12	RFIN	Front Rch input	25	NC	Non connection
13	SGND	Signal GND

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