Read Sony ICF-CD73 / ICF-CD73V Service Manual online
ICF-CD73/CD73V
18
18
6-2.
BLOCK DIAGRAM – TUNER Section (ICF-CD73) –
2
24
4
7
20
21
FM
RF AMP
FM
MIX
FM
OSC
FM IF
AMP
IF
BUFFER
AF
BUFFER
AF
AMP
MPX
MUTE
STEREO/
MONO,
FM/AM
FM/AM
AM IF
AMP
FM
DET
AM
DET
DET
6
FM
RF IN
RF IN
22
AM
RF AMP
AM
MIX
AM
RF IN
RF IN
MIX OUT
OSC
OUT
CF2
FM/AM PLL
IC2
CF4
FM
RF OUT
RF OUT
10
QUAD
FM
IF IN
IF IN
12
15
11
L-OUT
MPX
IN
IN
R-OUT
13
AM
IF IN
IF IN
LPF1/BAND
AM OSC
FM OSC
FM/AM RF AMP, MIX, OSC,
FM/AM IF AMP, DET, MPX
IC1
L2
FM VCO VOLTAGE
L4
AM VCO VOLTAGE
CT1, L1
FM TRACKING
CT3, L3
AM TRACKING
T1
AM IFT
LOW-PASS
FILTER
LOW-PASS
FILTER
• SIGNAL PATH
: FM
: AM
X1
75kHz
CT3
L1
FM RF
XOUT
XIN
AMIN
IF IN
ST
-IND
LP-OUT
LP-IN
FMIN
20
19
11
12
18
FM/AM
6
CT1
D1
L4
AM OSC
L2
FM OSC
LEVEL
DET
ST
IND
14
LPF2/MO-ST
AM
OSC
BUFFER
BUFFER
SWALLOW
COUNTER
UNIVERSAL
COUNTER
CCB
INTERFACE
REFERENCE
DIVIDER
UNLOCK
DETECT
12 BIT
PROGRAMMABLE
DIVIDER
PHASE
DETECTOR/
CHARGE PUMP
SHIFT REGISTER & LATCH
1/2
BAND
DI
CL
CE
DO
DET
OUT
ANT1
FM LEAD WIRE
ANTENNA
PD
IF OUT
ST IND
2
3
1
4
10
9
BAND
7
MO/ST
13
8
17
16
17
18
16
19
D2
D3
(1/2)
D3
(2/2)
T1
AM IF
• R-ch is omitted due to same as L-ch.
PLL DATA
PLL CLK
PLL CE
COUNT
R-CH
(Page 20)
C
MUTE
TU LCH
(Page 20)
B
T2
FM IFT
T2
FM IF
L3
AM FERRITE-ROD
ANTENNA
VT B+
PLL DATA, PLL CLK,
PLL CE, COUNT, MUTE
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