Read Sony CFD-S28 Service Manual online
CFD-S28
– 19 –
– 20 –
6-2.
BLOCK DIAGRAM – TUNER Section –
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
6
FM RF
IN
IN
22
AM
RF AMP
AM
MIX
AM RF
IN
IN
FM/AM
MIX OUT
OSC
OUT
OUT
CF1
10.7MHz
CF3
10.7MHz
FM/AM PLL
IC2
CF4
450kHz
FM
RF OUT
RF OUT
10
QUAD
FM
IF IN
IF IN
12
15
11
LOUT
MPX
IN
IN
ROUT
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
T1
IFT
CT3, L3
AM TRACKING
B.P.F.
FL1
LOW-PASS
FILTER
• SIGNAL PATH
: FM
: AM
05
X1
75kHz
CT3
L3
AM FERRITE-ROD
ANTENNA
L1
FM RF
XOUT
XIN
AM IN
IF IN
ST
-IND
MW
LP-OUT
LP-IN
FM IN
21
20
12
13
19
7
LW
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
L-CH
R-MUTE
R-DATA
R-CLOCK
R-LATCH
R-COUNT
R-CH
CNP2
(1/2)
CNP1
1
2
DET
OUT
ANT1
FM TELESCOPIC
ANTENNA
PD
IF OUT
ST IND
3
4
2
5
11
10
BAND
8
MO/ST
14
9
18
17
17
18
16
19
D2
D3
(1/2)
D3
(2/2)
Q13
IF REQUEST
SWITCH
Q12
AM HIGH
CUT
SWITCH
5
1
3
2
4
TUNER BOARD (1/2)
B
(Page 21)
C
(Page 21)
T1
AM IF
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