CFD-S28L
– 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
AM IF
AMP
FM
DET
AM
DET
6
FM RF
IN
22
AM
RF AMP
AM
MIX
AM RF
IN
FM/AM
MIX OUT
OSC
OUT
CF1, 2
10.7MHz
CF3
10.7MHz
FM/AM PLL
IC2
CF4
450kHz
FM
RF OUT
10
QUAD
FM
IF IN
12
15
11
LOUT
MPX
IN
ROUT
13
AM
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
T1
AM IF
L4
LW VCO VOLTAGE
CT1, L1
FM TRACKING
T1
IFT
CT3, L3-1
MW
TRACKING
CT5, L3-2
LW
TRACKING
B.P.F.
FL1
LW BAND
SELECT SWITCH
Q2
LOW-PASS
FILTER
Q61
LOW-PASS
FILTER
MW BAND
SELECT SWITCH
Q40
• SIGNAL PATH
: FM
: MW/LW
05
X1
75kHz
CT3
Q43
CT5
L3
MW/LW 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
MW/LW 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
7
6
DET
OUT
Q41
Q41, 42
MW SWITCH
Q42
L3-1
MW
L3-2
LW
B+
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)
Q43
LW SWITCH
Q44
LW
SWITCH
Q13
IF REQUEST
SWITCH
Q12
AM HIGH
CUT
SWITCH
5
1
3
2
4
TUNER BOARD (1/2)
B
(Page 21)
C
(Page 21)
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Q
Q
TEL 13942296513 QQ 376315150 892498299
TEL 13942296513 QQ 376315150 892498299
