JVC MX-K30 Service Manual page 24

LA1823DIP (IC1) : 1chip AM/FM, MPX tuner system
1. Block diagram
24 23
GND2
FM
RF
AM
RF
REG
1 2
2. Pin function
Pin
I/O
Symbol
No.
1 AM_RFIN I AMRF signal input
2 REG. -
3 AM_OSC - AM local oscillation circuit
4 VCC_1 - Power supply terminal
5 FM_MIXOUT O Output terminal for FM mixer
6 GND_1 - Ground
7 IF_BUFFER O IF buffer output
8 ST_IND O Stereo indicator output
9 AM_MIXOUT O Output terminal for AM mixer
10 FM_IF IN I Input of FMIF signal
11 AM_IF IN I Input of AMIF signal
12 AGC I AGC voltage input terminal
1-24
22 21 20
VCC2
FM
OSC
FM
MIX
AM
MIX
OSC
BUFFER
AM
OSC
VCC1 GND1
3 4 5
Function
19 18 17
MUTE
DECODER
ST SW VCO
TRIG
SD ST
IF
BUFFER
6 7 8
Pin
Symbol
No.
13 FM_DET
14 ST/MON_SW
15 AM/FM_SW
16 L_OUT
17 R_OUT
18 MPX_IN
19 DET_OUT
20 FM_OSC
21 VCC_2
22 FM_RFOUT
23 GND_2
24 FM_RFIN
16 15 14
PHASE PILOT FM
COMP DET DET
FF FF FF
FM AM
AGC
S-METER DET
FM AM
IF IF
9 10 11
Function
I/O
O FM detection signal output
I Stereo/Monaural switching signal input
I AM/FM switching signal input
O Output L-channel
O Output R-channel
I Multiplex signal input
O AM/FM detection output
- FM local oscillation circuit
- Power supply terminal
O Output of FMRF signal
- Ground
I Input of FMRF signal
13
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