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5-20. IC BLOCK DIAGRAMS
• Tuner section
IC21 LC72130
20
19
24
23
22
21
PHASE DETECTOR
CHARGE PUMP
UNLOCK
DETECTOR
REFERENCE
SWALLOW COUNTER
DIVIDER
1/16, 1/17 4BITS
12BITS PROGRAMMABLE
2
C
B
DATA SHIFT REGISTER LATCH
I/F
1
2
3 4 5 6
IC41 LA1838
30
29
28
27
26
25
REG
ALC
AM
AM
AM
OSC
MIX
RF. AMP
BUFF
AGC
SD
COMP
AM
IF
AM
AM/FM
S METER
IF
FM
S-CURVE
BUFF
S METER
TUNING
DRIVE
FM
FM
IF
DET
GND
1
2 3
4
5
18
17
16
15
14
POWER
ON
1/2
RESET
DRIVER
UNIVERSAL
COUNTER
7
8
9
10
11
24
23
22
21
DECODER
ANTI BIRDIE
STEREO
DRIVE
DET
FF
VCO
PHASE
DET
VCC
6
7
8
9
10
11
– 52 –
13
12
20
19
18
17 16
STEREO
SW
MUTE
FF
FF
PILOT
DET
13
12
14
15
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