JVC KS-LX200R service manual LA3460M-X IC31 FM noise canceller & Stereo MPX demodulator

KS-LX200R

LA3460M-X (IC31) : FM noise canceller & Stereo MPX demodulator

1. Pin layout
24		13
1		12
2. Block diagram
24	23	22	21	20	19	18	17	16	15	14	13
		DRIVER		PC	LPF		VCO	VCO STOP
							FF		PACAN
				PD	LPF	SCHMIT			SEPARATION
										ADJ.	SUB
HPF		LPF
							MAIN		ANTI-BRIDGE
			GATE
									DECODER
						HCC
		TRIG								SNC
	AGC						CONTROL
1	2	3	4	5	6	7	8	9	10	11	12
3. Pin function

Pin	Function	Description
No.
1	Noise sense	Noise sensitivity adjustment
2	Noise AGC
3	Gate time
4	Signal hold
5	Pilot output
6	Vcc	Vcc=+8.0V
7	Capacitor for HCC	High pass filter
8	SNC control	Stereo noise controlled voltage
9	HCC control	High cut controlled voltage
10	Lch output
11	Rch output
12	Pican input	pilot cancel signal input
13	Pican output	pilot cancel signal outpt
14	Separation ADJ
15	NC
16	NC
17	456kHz OSC	Ceramic resonator
18	Phase comp LPF (+)	Phase comparator low pass filter
19	Phase comp LPF (-)	Phase comparator low pass filter
20	GND
21	PLL input	Phase locked loop signal input
22	Stereo indicator	Active low
23	Composite input	Composite signal input
24	Pilot det LPF

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