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ICF-CD873
6-2.
BLOCK DIAGRAM – TUNER Section –
MAIN BOARD (2/3)
ANT1
FM WIRE
ANTENNA
B.P.F.
BPF1
CT1, L1
L1
FM RF
FM TRACKING
CT1
D2
CT2, L3
AM TRACKING
L3
AM FERRITE-ROD
ANTENNA
CT2
D4
(1/2)
LOW-PASS
FILTER
Q50, 51
PD1
15
2
• SIGNAL PATH
: FM
: AM
05
FM/AM FRONT-END,
FM/AM DET, MPX
IC1
FM RF
FM/AM
IN
FE OUT
FM
18
16
FRONT-END
T1
FM RF
AM IF
20
AM RF
IN
AM
STEREO/MONO
19
FRONT-END
SELECT
24
22
REGULATOR
L4
L2
AM FREQUENCY
FM FREQUENCY
COVERAGE
COVERAGE
21
L2
L4
AM OSC
FM OSC
D3
D4
(2/2)
B+
(FM/AM RF/OSC CIRCUIT)
11
12
FM/AM PLL
IC50
PHASE
MAIN CONTROL
DETECT
PRESCALLER
P1
8
OUTPUT
P0
CONTROL
7
IF IN
I/O CONTROL
IF
9
REGISTER
COUNTER
1
5 4 3
X50
75kHz
– 17 –
CF3
10.7MHz
26
CF2
FM
10.7MHz
IF IN
FM IF AMP/
DECODER
13
DISCRI
AMP
TUNING
INDICATOR
CF1
AM
450kHz
IF IN
AM IF AMP/
SWITCH
14
DET
PD1
1/2
SELECT
CONTER
PD2
FM/AM
VCO
7
15
3
2
1
29
27
L.P.F.
RV1
FM VCO
B+
(5V)
L-CH OUT
TUNER L-CH
C
6
R-CH OUT
TUNER R-CH
(Page 19)
5
TUN IND
12
ST IND
4
TUNER ON
D
(Page 19)
DATA, CLOCK, LATCH
B
(Page 16)
– 18 –
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