SRF-H3 (serv.man2) - Sony Audio Service Manual (repair manual). Page 5

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SRF-H3
— 5 —
— 6 —
• 
IC BLOCK DIAGRAMS
IC1   TA7792F
IC3   LA4537M

Note on Schematic Diagram:
• All capacitors are in µF unless otherwise noted.  pF: µµF 50 WV or
less are not indicated except for electrolytics and tantalums.
• All resistors are in 
Ω
 and 
1
/
4
 
W or less unless otherwise specified.
•
f
: internal component.
•
A
: B+ Line.
•
H
: adjustment for repair.
• Power voltage is dc 1.5 V and fed with regulated dc power supply
from battery terminal.
• Voltages are dc with respect to ground under no-signal conditions.
• Voltages are taken with a VOM (Input impedance 10 M
Ω
).
Voltage variations may be noted due to normal production toler-
ances.
• Signal path.
F
:
FM
f
:
AM
Note on Printed Wiring Board:
• X
: parts extracted from the component side.
• b
: Pattern from the side which enables seeing.
16
BPF
FM RF IN
FM RF
IN
AM IF
IN
FM RF OUT
1
FM OSC
3
AM OSC
4
L2
FERRITE-ROD
ANTTENA
L5
BUFFER
Q1
CT1-1
CV1-1
CV1
TUNE
13
5
14
AM RF IN
AM MIX
OUT
FM MIX
OUT
FM MIX
AM MIX
AM OSC
FM OSC
CF1
12
T1
CF2
7
8
5
13
16
15
2
AM AGC
FM DET
VCO
R-CH
R-CH
RV2
38k
19k<90º 19k<0º
AM DET
AF
OUT
VCC1
R OUT
L OUT
9
RV1
VCO
L3
CT1-2
B+(R16)
B+(R16)
B+(R16)
B+(R16)
CV1-2
FM/AM
FRONT END
IC1(1/3)
STEREO MPX
IC2
SP1
SPEAKER
SP2
SPEAKER
FM:
AM:
ANT1
FM ANT
DX/LOCAL
L4
CT1-3
CV1-3
T2
B+
CT1-4
CV1-4
STEREO
DECODE
11
VOL
6
MPX
MPX
SENS
DX     LOCAL
S1
S1-1
S1-2
9
POWER AMP
IC3
BAND
FM     AM
S2
B+
2
AM B+
AM B+
POWER
OFF      ON
S3
B+
16
• Signal path
FM FREQ. COVERAGE
AM FREQ. COVERAGE
FM TRACKING
AM TRACKING
AM IF
FM
IF
3
MUTE SWITCH
OUT 1
POWER GND
OUT 2
V
CC
POWER SWITCH
IN 1
PRE GND
IN 2
REF
POWER
SWITCH
MUTE
CIRCUIT
Amp1
Amp2
BIAS
6
7
8
9
10
1
2
4
5
POWER
SWITCH
MUTE
BIAS
AMP
AMP
1
2
3
4
5
6
7
8
9
10 MUTE
R-OUT
GND
L-OUT
VCC
PWR
R-IN
GND
L-IN
REG
SECTION 4
DIAGRAMS
4-1. BLOCK DIAGRAM

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