Ic Block Diagrams; Tuner Section - Sony STR-W555 Service Manual

5-20. IC BLOCK DIAGRAMS

• Tuner section

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