Sony CFM-20L Service Manual ▷ View online
7
CFM-20L
FM Section
Function switch (S101)
: FM
Volume
: MIN
Tape Speed Adjustment
Procedure :
Mode : Playback
Procedure :
Mode : Playback
Adjustment Value :3,000Hz
Standard Value
Standard Value
:2,960 to 3,040Hz
Frequency difference between the beginning and the end of the tape
should be within 1.0% (30Hz).
should be within 1.0% (30Hz).
Adjustment Location :
TUNER SECTION
LW Section
Function switch (S101)
: LW
Volume
: MIN
CT3, CT4
: mechanical center
0dB=1
µV
set
test tape
WS-48B
(3kHz, 0dB)
WS-48B
(3kHz, 0dB)
digital frequency
counter
counter
J101 (Earphone jack)
8
Ω
+
tape speed adjustment
control inside motor
control inside motor
AM RF signal
generator
generator
30% amplitude modulation by 400Hz
signal.
Output level : as low as possible
signal.
Output level : as low as possible
Put the lead-wire
antenna close to
the set.
antenna close to
the set.
set
+
level meter
J101 (Earphone jack)
8
Ω
set
+
level meter
J101 (Earphone jack)
8
Ω
FM RF signal
generator
generator
75kHz frequency deviation by
1kHz signal.
Output level : as low as possible
1kHz signal.
Output level : as low as possible
telescopic
antenna
terminal
antenna
terminal
0.01 F
µ
8
CFM-20L
• 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.
LW IF ADJUSTMENT
Adjust for a maximum reading on level meter.
T1
455kHz
LW FREQUENCY COVERAGE ADJUSTMENT
Adjust for a maximum reading on level meter.
L4
145kHz
CT6
300kHz
LW TRACKING ADJUSTMENT
Adjust for a maximum reading on level meter.
L3
160kHz
CT5
260kHz
FM FREQUENCY COVERAGE ADJUSTMENT
Adjust for a maximum reading on level meter.
L2
87.00MHz
CT1
108.30MHz
FM TRACKING ADJUSTMENT
Adjust for a maximum reading on level meter.
L1
87.00MHz
CT2
108.30MHz
Adjustment Location : MAIN board
FM IF ADJUSTMENT
Adjust for a maximum reading on level meter.
L5
10.7MHz
[MAIN BOARD]
(Conductor side)
(Conductor side)
CT3 : LW Frequency Coverage Adjustment
(Set to mechanical center)
(Set to mechanical center)
CT4 : LW Tracking Adjustment
(Set to mechanical center)
(Set to mechanical center)
CT2: FM Tracking Adjustment
CT1 : FM Frequency
Coverage Adjustment
Coverage Adjustment
[MAIN BOARD]
(Component side)
(Component side)
L5 : FM IF Adjustment
T1: LW IF Adjustment
L1: FM Tracking Adjustment
L3: LW Tracking Adjustment
L4 : LW Frequency
Coverage Adjustment
Coverage Adjustment
CT5 : LW Tracking Adjustment
CT6 : LW Frequency
Coverage Adjustment
Coverage Adjustment
L2: FM Frequency
Coverage Adjustment
Coverage Adjustment
9
9
CFM-20L
SECTION 4
DIAGRAMS
4-1. BLOCK DIAGRAMS
• Signal path.
F
: FM
f
: LW
E
: PB
a
: REC
N
: MIC
VOLUME
ANT1
CT2
CT1
CV1
CV2
CF1
CF2
ECM101
M101
SP101
J101
F901
HRP101
HE101
RV101
T1
L5
L1
L2
J901
CT4
CT3
CV3
CV4
D104
D101
D103
S501
L4
CT5
CT6
FM
TELESCOPIC
ANTENNA
SPRAKER
QUAD
FM RF OUT
BAND SEL
FM OSC
DET OUT
FM RF IN
MIX OUT
FM IF IN
IF AMP,DET,FM MPX
RADIO
+B
REEL/CAPSTAN
MOTOR
(TAPE POWER)
MIC
S102
PB/REC
REC/PB
HEAD
ERASE
HEAD
TRANSFORMER
POWER
T901
IN
MIC
IN
IN
PRE/POWER
AMP
POWER
ON/OFF
ON/OFF
AUX
TAPE
AUX
AUX
HEAD IN
(+)
(+)
HEAD IN
(-)
(-)
BTL1
BTL2
REC/PB
DRY BATTERY
SIZE"D"
(IEC DESIGNATION R20)
4PCS,6V
D901,902
RECT
+B
REG
+B
BIAS
BIAS
LINE
OUT
IN
POWER
IC1
IC101
AC IN
ANTENNA
L3
RADIO
+B
REG
Q101
RIPPLE
FILTER
FILTER
FERRITE-BAR
FM/LW FRONT-END
LW
LW IF IN
LW RF IN
LW OSC
OPR/BATT
+B
+B
RADIO +B
FUNCTION
TAPE/
RADIO OFF
FM
FUNCTION
TAPE/
RADIO OFF
FM
S101-1
S101-2
LW OSC
LW
LW
TRACKING
COVERAGE
FREQUENCY
FM
COVERAGE
FREQUENCY
TRACKING
FM
CT2,L1
CT1,L2
CT5,L3
LW
CT6,L4
LW
FM DET
LW IF
10
10
CFM-20L
JACK BOARD
POWR BOARD
BATT(+) BOARD
MAIN BOARD
1-680-974-
11
(11)
1-680-977-
11
(11)
1-680-978-
11
(11)
1-680-979-
11
(11)
CV1
CV3
CV2
CV4
CT2
CT4
CT1
CT3
CT6
S501
(TAPE POWER)
M101
REEL/CAPSTAN
MOTOR
M
v
SP101
SPEAKER
L3
LW
FERRITE-BAR
ANTENNA
ANT1
FM
TELESCOPIC ANTENNA
DRY BATTERY
SIZE "D"
(IEC DESIGNATION R20)
4PCS, 6V
AC IN
T901
POWER TRANSFORMER
2
3
4
5
6
7
8
9
10
11
A
1
B
C
D
E
F
G
H
CT5
R118
J101
KH103
JW901
JW902
D902
D901
C901
C902
F901
J901
CNP901
KH901
JW901
JW902
R101
R102
R103
R104
R105
15
R106
R107
R108
R111
R112
10
R114
16
C101
C103
C108
C109
C113
C114
C115
30
C116
C118
C120
20
C123
C130
C105
R4
C13
R116
R117
S102
(REC/PB)
JC101
C106
R110
R115
R109
5
1
25
IC1
R121
R122
C134
C7
C2
C3
R2
JC3
C1
C122
C132
R3
C18
JC1
JC2
C19
C20
R1
C15
C9
C10
JC4
C136
C125
C135
C102
C104
C107
C110
C111
C117
D1
D2
L2
L5
JW1
JW2
JW4
JW5
JW7
JW101
JW102
JW103
JW104
JW105
JW106
JW107
JW108
JW109
JW110
JW111
JW113
C119
D104
OPR/BATT
L1
IC101
D106
C11
C12
L4
C4
C5
CNP101
R120
CNP102
KH101
KH102
C121
R113
C112
C124
Q101
C131
R132
R131
C133
S101
CNP103
-2 -1
C16
CF1
CF2
T1
C17
C16
JW3
JW6
RV101
VOLUME
D101
D102
D103
C21
L10
B C E
S101
FUNCTION
FM
LW
TAPE/RADIO OFF
-2
-1
ECM101
MIC
HRP101
REC/PB
HEAD
HE101
ERASE
HEAD
C126
D108
D107
4-2. PRINTED WIRING BOARDS
Ref. No.
Location
z
Semiconductor
Location
MAIN BOARD
Note:
• X : parts extracted from the component side.
•
• X : parts extracted from the component side.
•
: Pattern on the side which is seen.
•
f
: internal component.
D1
A-4
D2
A-4
D101
B-5
D102
C-8
D103
B-7
D104
B-8
D106
B-5
D107
A-7
D108
A-8
D901
E-4
D902
E-4
IC1
B-3
IC101
B-7
Q101
B-5
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