JVC HX-Z1

HX-Z1
50
5.18LA1838 (IC1): FM AM IF amp & Detector, FM MPX decoder
• Pin layout / Block Diagram
• Pin Function
PinNo. Symbol I/O Function PinNo. Symbol I/O Function
1 FM IN I This is an input terminal of FM IF signal. 16 L OUT O Left channel signal output.
2 AM MIX O This is an out put terminal for AM mixer. 17 R OUT O Right channel signal output.
3 FM IF I Bypass of FM IF 18 L IN I Input terminal of the Left channel post
AMP.
4 AM IF I Input of AM IF Signal. 19 R IN I Input terminal of the Right channel
post AMP.
5 GND - This is the device ground terminal. 20 RO O Mpx Left channel signal output.
6 TUNED O When the set is tunning,this terminal
becomes "L".
21 LO O Mpx Right channel signal output.
7 STEREO O Stereo indicator output. Stereo "L",
Mono: "H"
22 MPX IN I Mpx input terminal
8 VCC - This is the power supply terminal. 23 FM OUT O FM detection output.
9 FM DET - FM detect transformer. 24 AM DET O AM detection output.
10 AM SD - This is a terminal of AM ceramic filter. 25 AM AGC I This is an AGC voltage input terminal
for AM
11 FM VSM O Adjust FM SD sensitivity. 26 AFC - This is an output terminal of voltage
for FM-AFC.
12 AM VSM O Adjust AM SD sensitivity. 27 AM RF I AM RF signal input.
13 MUTE I/O When the signal of IF REQ of IC121(
LC72131) appear, the signal of FM/AM
IF output. //Muting control input.
28 REG O Register value between pin 26 and pin28
besides the frequency width of the input
signal.
14 FM/AM I Change over the FM/AM input.
"H" :FM, "L" : AM
29 AM OSC - This is a terminal of AM Local oscillation
circuit.
15 MONO/ST O Stereo : "H", Mono: "L" 30 OSC BUFFER O AM Local oscillation Signal output.