Diagrams; Block Diagram - Sony SRF-M73 Service Manual

Adjustment Location:
– MAIN BOARD (Component Side) –
– MAIN BOARD (Conductor Side) –
L4
AM VCO Voltage Adjustment
RT1
FM Free-Run Adjustment
CT1
AM Tracking Adjustment
L1
AM Tracking Adjustment

CT2
 FM Tracking Adjustment
L2 
J1
T1
AM IF Adjustment
– 7 –
5-1.

BLOCK DIAGRAM

S1
FM SENS
B.P.F.
BPF1
DX
L2
FM RF
LOCAL
(PANAMA)
CT2, L2
FM TRACKING
L1
AM FERRITE-ROD
ANTENNA
D1-1
CT1, L1
TP
CT1
AM TRACKING
(VT)
TP
(MPX)
TP
(FM IN)
• SIGNAL PATH
: FM
: AM
05
SECTION 5

DIAGRAMS

FM/AM FRONT-END,
FM/AM DET, MPX
IC1
CF3: US
FM/AM CF4, 5: PANAMA
FM RF
MIX OUT 10.7MHz
IN FM
18 16 13
FRONT-END
FM
RF
T1
20
AM IF
D2 CF2
450kHz
14
CT2
AM RF
IN
AM
19
FRONT-END
AM IF
BUFFER
Q4, 5
24 22
L4
AM VCO VOLTAGE
L4 L3
AM OSC FM OSC
D1-2 D3
FM VCO
LOW-PASS
BUFFER
FILTER
Q1
Q101
19 20 21 17
KS0 – KS3 KR0 – KR3 COM0 – COM3 SEG0 – SEG14
6 – 9 10 – 13 31 – 34
15 14 16 24 25
X101
75kHz
LIQUID CRYSTAL DISPLAY
LCD101
3 4 2 1
KEY MATRIX
S101 – 111, 113 – 116
EEPROM
IC105
– 8 –
CF1
B+
VREF
10.7MHz
26 21 7
BASS BOOST AMP
L-CH
REGULATOR
OUT IN1
6 1
FM
IF IN DECODER
FM IF AMP/
AMP R-CH
DISCRI
OUT IN2
5 2
TUNING
INDICATOR
SWITCH
AM
BASS
1/2
IF IN AM IF AMP/
PD1 BOOST
COUNTER
DET CONTROL
1/2
PD2
COUNTER DET
ST IND
4
VCO
BAND
SELECT
12
15 12 9 3 2 1 29 27
L.P.F.
B+
FM/AM BAND
RT1
SELECT SWITCH
FM FREE-RUN
Q3
5
7
COMPARATOR
6
IC4 (1/2)
3
1
COMPARATOR
2
IC4 (2/2)
3 53
SYSTEM CONTROLLER,
LIQUID CRYSTAL DISPLAY DRIVER,
KEY CONTROL
IC101
35 – 49
2 1
SYSTEM CONTROLLER (IC101),
EEPROM (IC105) B+
FM/AM TUNER (IC1),
HEADPHONE AMP (IC3) B+
BASS BOOST AMP (IC2) B+
D105
PLL LOW-PASS FILTER CIRCUIT B+
AM IF AMP CIRCUIT B+
– 9 –
SRF-M73
HEADPHONE AMP
IC2 IC3
RV1
VOL
OUT1 IN1 OUT1
POWER
14 2 9
AMP
–1
OUT2 IN2 OUT2
POWER
13 4 7
AMP
–2
LP MUTE
GAIN S2 CONTROL
6
MEGA
BASS
ON
OFF
10
+
J1
2
(HEADPHONE)
5 52
50
VOLTAGE
DETECT
IC102
DRY BATTERY
SIZE "AAA"
(IEC DESIGNATION R03)
2PCS. 3V
RIPPLE FILTER
Q2
DC/DC
B+ SWITCH
CONVERTER
Q104
Q103, T101
B+ SWITCH
Q6