Read Sony CFD-E55L Service Manual online
CFD-E55L
– 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
CONSTANT
CURRENT
Q3
LW BAND
SELECT SWITCH
Q9
MW BAND
SELECT SWITCH
Q8
AM
MIX
AM RF
IN
IN
MIX OUT
OSC
OUT
OUT
CF1, 2
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
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
LW VCO VOLTAGE
CT1, L1
FM TRACKING
T1
IFT
B.P.F.
FL1
LOW-PASS
FILTER
• SIGNAL PATH
: FM
: MW/LW
05
X1
75kHz
CT2
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
B-MUTE
R-DATA
R-CLOCK
R-LATCH
R-COUNT
R-CH
CNP1
CNP312
1
DET
OUT
ANT1
FM TELESCOPIC
ANTENNA
PD
IF OUT
ST IND
3
4
2
5
11
10
LPF1/BAND
8
LPF2/MO/ST
14
9
18
17
17
18
16
19
CT3
D2
D3
(1/2)
D3
(2/2)
IF REQUEST
SWITCH
Q2
AM HIGH
CUT
SWITCH
Q1
2
3
1
4
MAIN BOARD (1/3)
T1
AM IF
C
TO MAIN SECTION
(Page 21)
TUNER L-CH
FROM MAIN SECTION
(Page 21)
D
TO MAIN
SECTION
(Page 21)
(Page 21)
E
R-CH: Same as L-CH.
Q6
Q4
Q5
B+
Q4, 5
MW SWITCH
L3-1
MW
L3-2
LW
L3
MW/LW FERRITE-ROD
ANTENNA
MW
TRACKING
CT2, L3-1
LW
TRACKING
CT3, L3-2
Q7
LW
SWITCH
Q6
LW SWITCH
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