Sony CFM-20 (serv.man2) Service Manual ▷ View online
13
13
CFM-20
z
Refer to page 14 for Notes.
z
Refer to page 14 for IC Block Diagrams.
4-3. SCHEMATIC DIAGRAM – MAIN SECTION (1/2) –
ANT1
CF2
CF1
D1
D2
C2
L5
C1
C15
T1
C3
L1
C4
R4
R2
R1
C19
C20
C21
L10
0.47
0.47
µH
JW7
JW3
C17
C16
C18
R3
L4
C11
C7
JW4
JW5
C13
JW6
JC4
JC1
JC2
JW1
C5
C9
L2
L2
JC3
FM
TELESCOPIC
ANTENNA
1SS133
1SS133
10p
100p
0.047
10k
10
0.022
0.047
100p
100
10V
10V
4.7
50V
50V
0.01
330
3p
22p
0
GND
+B
SIG
GND
BAND
*
*
*
*
*
AFC
QUAD
AM RF IN
FM RF OUT
BAND SEL
FM OSC
AM OSC
DET OUT
AGC
VCC
GND
FM RF IN
RF GND
MIX OUT
FM IF IN
AM IF IN
IF AMP,DET,FM MPX
IC1
AM
ANTENNA
L3
FERRITE-BAR
TA2132AF
FM/AM FRONT-END
C&SA,AR,HK,MX,SP,TW
*C3
7p
10p
FM RF
CT1
CV1
CV2
CT2
FM OSC
C&SA,AR,HK,MX,SP,TW
*C4
15p
18p
AEP,UK,CET,IT
*R2
6.8k
4.7k
IT,C&SA,AR,HK,MX,SP,TW
AEP,UK,CET
CT4
CV4
CT3
CV3
AM OSC
*C11
3.3p
6.8p
C&SA,MX,TW
AEP,UK,CET,IT,AR,HK,SP
AM
FREQUENCY
COVERAGE
CT3,L4
TRACKING
AM
CT4,L3
TRACKING
FREQUENCY
COVERAGE
CT2,L1
FM
FM
CT1,L2
*C5
6.8p
EXCEPT IT
IT
10p
IT
AEP,UK,CET
15p
IT MODEL
EXCEPT
IT MODEL
(2/2)
BOARD
MAIN
14
14
CFM-20
4-4. SCHEMATIC DIAGRAM – MAIN SECTION (2/2) –
z
Refer to page 14 for Notes.
z
Refer to page 14 for IC Block Diagrams.
D901
D902
CNP901
HE101
M101
R108
R109
R110
R111
R114
C121
C122
C123
C118
C119
C120
C115
C117
C101
R101
R102
C102
R103
C104
C107
C108
C109
C110
C112
C113
C111
R105
R104
C103
R106
R107
C116
CNP102
R113
CNP101
R112
C114
HRP101
SP101
J101
ECM101
J901
D102
D103
D106
C130
C131
C132
C133
C134
C135
D101
JW116
R115
JW107
JW108
C125
RV101
R118
SP101
C901
C902
CNP901
D901
D902
D903
C901
C902
F901
JW106
C105
C106
C124
R122
C136
S501
KH101
R116
R117
D104
R132
R131
R120
CNP103
R121
KH103
KH102
KH901
KH901
D107
D108
C126
Q101
JC101
1N4002B
1N4002B
1k
22k
15k
1k
10
2200
16V
0.01
0.1
0.01
47
10V
4700p
0.01
1
50V
2200p
15k
22k
2.2
50V
220
22
25V
220
10V
0.01
0.01
0.47
50V
100
10V
0.1
470
16V
10
220
0.022
1k
2.2k
0.047
150
3P
470k
100p
SPRAKER
1SS133
1SS133
1SS133
0.1
470
6.3V
0.01
220
10V
10V
1000p
0.01
MTZJ3.9B
680
100p
20k
100
SPRAKER
0.1
0.1
1N4002B
1N4002B
1N4002B
0.01
0.01
T630mAL
250V
1000p
1000p
0.47
50V
10k
100p
1k
4.7k
L-34HD
220
220
1k
2P
6.8k
1SS133
1SS133
4700p
KTC3198BL
REG
+B
SIG
GND
BAND
GND
TRANSFORMER
POWER
T901
MIC
N.F
NF
EQ
BIAS
BIAS
SIG
GND
LINE
OUT
POWER
GND
SIG
VCC
POWER
GND
ALC
NC
IN
MIC
IN
IN
TAPE
TAPE
POP
DEL
PRE/POWER
AMP
DRY BATTERY
SIZE"D"
(IEC DESIGNATION R20)
4PCS,6V
REC/PB
HEAD
ERASE
HEAD
REEL/CAPSTAN
MOTOR
(TAPE POWER)
REC
POWER
ON/OFF
LPF
DEL
P.VCC
P.VCC
AUX
TAPE
AUX
HEA
D IN
(+)
HEA
D IN
(–)
RIPPLE
FILTER
POWER
RIPPLE
FILTER
BTL1
BTL2
S102
IC101
MM1315BD
1
3
MIC
PB/REC
REC
/PB
MIX
ON/OFF
-1
-2
1
2
1
2
AC IN
TRANSFORMER
POWER
T901
1
2
AC IN
1
2
S101
FUNCTION
TAPE/
RADIO OFF
AM
FM
S101
FUNCTION
TAPE/
RADIO OFF
AM
FM
VOLUME
AEP,UK,CET,IT,AR,HK,SP
AEP,UK,CET,IT,AR,HK,SP
OPR/BATT
MX,C&SA,TW
AEP,UK,CET,IT,AR,HK,SP
MX,C&SA,TW
AEP,UK,CET,IT,AR,HK,SP
9
CFM-20
• Repeat the procedures in each adjustment several times, and the
frequency coverage and tracking adjustments should be finally
done by the trimmer capacitors.
done by the trimmer capacitors.
AM IF ADJUSTMENT
Adjust for a maximum reading on level meter.
T1
455kHz
AM FREQUENCY COVERAGE ADJUSTMENT
Adjust for a maximum reading on level meter.
L4
520kHz<516kHz>
CT3
1,680kHz (1780kHz) <1,630kHz>
AM TRACKING ADJUSTMENT
Adjust for a maximum reading on level meter.
L3
600kHz
CT4
1,400kHz (1500kHz)
FM FREQUENCY COVERAGE ADJUSTMENT
Adjust for a maximum reading on level meter.
L2
87.00MHz (86.50MHz) <87.35MHz>
CT1
108.30MHz (109.50MHz) <108.25MHz>
FM TRACKING ADJUSTMENT
Adjust for a maximum reading on level meter.
L1
87.00MHz (86.50MHz) <87.35MHz>
CT2
108.30MHz (109.50MHz) <108.25MHz>
( ) : C&SA, MX, TW model
< > : IT model
< > : IT model
Adjustment Location : MAIN board
FM IF ADJUSTMENT
Adjust for a maximum reading on level meter.
L5
10.7MHz
( ) : C&SA, MX, TW model
< > : IT model
< > : IT model
[MAIN BOARD]
(Conductor side)
(Conductor side)
CT3 : AM Frequency Coverage Adjustment
CT4 : AM Tracking Adjustment
CT2: FM Tracking Adjustment
CT1 : FM Frequency
Coverage Adjustment
Coverage Adjustment
[MAIN BOARD]
(Component side)
(Component side)
L5 : FM IF Adjustment
T1: AM IF Adjustment
L1: FM Tracking Adjustment
L3: AM Tracking Adjustment
L4 : AM Frequency
Coverage Adjustment
Coverage Adjustment
L2: FM Frequency
Coverage Adjustment
Coverage Adjustment
• Abbreviation
MX
: Mexican
IT
: Italian
TW
: Taiwan
C&SA : Central and South America
15
CFM-20
• All capacitors are in
µF unless otherwise noted. pF: µµF 50 WV or
less are not indicated except for electrolytics and tantalums.
• All resistors are in
Ω and
1
/
4
W or less unless otherwise specified.
•
f
: internal component.
• C : panel designation.
Note: The components identified by mark 0 or dotted line with
mark 0 are critical for safety.
Replace only with part number specified.
Replace only with part number specified.
• A : B+ Line.
• H : adjustment for repair.
• Power voltage is dc 6V and fed with regulated dc power supply
• H : adjustment for repair.
• Power voltage is dc 6V and fed with regulated dc power supply
from external power voltage jack.
• Voltages are dc with respect to ground under no-signal (detuned)
conditions.
no mark : FM
(
no mark : FM
(
) : AM (RADIO SECTION), PLAY (TAPE SECTION)
<
> : MIC REC
[
] : RADIO REC
• Voltages are taken with a VOM (Input impedance 10 M
Ω).
Voltage variations may be noted due to normal production toler-
ances.
ances.
• Signal path.
F
: FM
f
: AM
E
: PB
a
: REC
N
: MIC
• Abbreviation
SP
: Singapore
HK
: Hong Kong
AR
: Argentina
MX
: Mexican
IT
: Italian
TW
: Taiwan
C&SA : Central and South America
CET
CET
: East European & Russian
Note on schematic Diagram: MAIN SECTION (1/2), (2/2)
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