Read Sony ICF-CD873L Service Manual online
ICF-CD873L
– 15 –
– 16 –
6-2.
BLOCK DIAGRAM – TUNER Section –
18
20
16
13
24
15
11
12
22
FM
FRONT-END
AM
FRONT-END
MAIN CONTROL
PRESCALLER
PHASE
DETECT
OUTPUT
CONTROL
IF
COUNTER
I/O CONTROL
REGISTER
FM IF AMP/
DISCRI
DECODER
AMP
SWITCH
TUNING
INDICATOR
STEREO/MONO
SELECT
FM/AM
SELECT
REGULATOR
1/2
CONTER
VCO
AM IF AMP/
DET
PD2
L.P.F.
PD1
14
FM RF
IN
IN
19
AM RF
IN
IN
FM/AM
FE OUT
CF2
10.7MHz
CF3
10.7MHz
CF1
450kHz
FM RF
26
FM
DISCRI
FM
IF IN
IF IN
4
ST IND
12
TUN IND
FM VCO
RV1
3
AM
IF IN
IF IN
PILOT DET
LPF1
7
VCC
15
BAND SELECT
VREF B+
(FM/AM RF/OSC CIRCUIT)
B+
(5V)
21
REG
29
PLL LPF2
27
VCO
1
PLL LPF1
2
PILOT DET
LPF2
AM OSC
FM OSC
FM/AM FRONT-END,
FM/AM DET, MPX
IC1
FM/AM PLL
IC50
L2
FM FREQUENCY
COVERAGE
L4
MW FREQUENCY
COVERAGE
CT4
LW FREQUENCY
COVERAGE
T1
AM IF
CT1, L1
FM TRACKING
CT2, L3-1
MW TRACKING
CT3, L3-2
LW TRACKING
B.P.F.
BPF1
LOW-PASS
FILTER
Q50, 51
• SIGNAL PATH
: FM
: MW/LW
05
L3
MW/LW FERRITE-ROD
ANTENNA
L1
FM RF
CT1
D2
CT2
Q1
CT3
L3-2
(LW)
L3-1
(MW)
CT4
L4
MW/LW
OSC
Q2
MW/LW
SWITCHING
Q1
MW/LW
SWITCHING
L2
FM OSC
TUNER L-CH
TUNER R-CH
L-CH OUT
ANT1
FM WIRE
ANTENNA
6
R-CH OUT
5
D3
D4
(1/3)
D4
(2/3)
VREF
VREF
D4
(3/3)
MAIN BOARD (2/3)
C
(Page 17)
TUNER ON
DATA, CLOCK, LATCH
D
(Page 17)
B
(Page 14)
X50
75kHz
P1
P0
IF IN
D
ATA
CLOCK
LA
TCH
XOUT
D
ATA
CLK
CE
FM IN
AM IN
PD1
5 4 3
1
XIN
2
8
P2
10
7
9
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