Sony CFM-20 (serv.man2) Service Manual ▷ View online
7
CFM-20
TAPE RECORDER SECTION
FUNOTION switch (S101)
: TAPE (RADIO OFF)
VOLUME (RV101)
: MIN
Standard Output Level
Output terminal
Earphone
Speaker
load impedance
8
Ω
12
Ω
output signal level
0.25V (–10dB)
0.775V (0dB)
Test Tape
Type
Signal
Used for
WS-48A
3kHz, 0dB
Tape Speed Adjustment
P-4-A063
6.3kHz
Record/Playback Head
Azimuth Adjustment
Record/Playback Head Azimuth Adjustment
Procedure :
1.Playback Mode
Procedure :
1.Playback Mode
2.Rotate the screw to adjust level meter reading to the maximum.
Note :
Note :
Adjust to the maximum peak though there may be two or
three peakes
three peakes
3.After the adjustment, lock the adjustment screws with suitable
locking compound.
• Abbreviation
SP
: Singapore
AR
:Argentina
HK
: Hong Kong
MX
:Mexican
IT
: Italian
TW
:Taiwan
C&SA : Central and South America
CET
CET
: East European & Russian
Adjustment Location :
SECTION 3
ADJUSTMENTS
3-1. MECHANICAL ADJUSTMENTS
PRECAUTION
1.Clean the following parts with a denatured-alcohol-moistened
swab :
record/playback head
pinch roller
erase head
rubber belts
capstan
2.Demagnetize the record/playback head with a head demagnetizer.
(Do not bring the head demagnetizer close to the erase head.)
3.Do not use a magnetized screwdriver for the adjustments.
4.After the adjustments, apply suitable locking compound to the
4.After the adjustments, apply suitable locking compound to the
parts adjusted.
5. The adjustments should be performed with the rated power sup
ply voltage unless otherwise noted.
Torque Measurement
Forward
CQ-102AS
Forward
CQ-102AS
Back Tension
Fast Forward
CQ-201WS
Rewind
CQ-201WS
Tape Tension Measurement
Torque Meter
Meter Reading
Torque
Torque Meter
Meter Reading
1.77 to 5.88 mN•m
(18 to 60 g•cm)
(0.25 to 0.83 oz•inch)
0.01 to 0.49 mN•m
(1 to 5 g•cm)
(0.014 to 0.069 oz•inch)
4.42 to 9.31 mN•m
(45 to 95 g•cm)
(0.63 to 1.31 oz•inch)
4.42 to 9.31 mN•m
(45 to 95 g•cm)
(0.63 to 1.31 oz•inch)
3-2. ELECTRICAL ADJUSTMENTS
CQ-405AS
more than 60g
(more than 2.12 oz)
(more than 2.12 oz)
0dB=0.775V
Head azimuth adjustment screw
set
test tape
P-4-A063J
(6.3kHz, -10dB)
P-4-A063J
(6.3kHz, -10dB)
Speaker output:12
Ω
Earphone jack:8
Ω
level meter
J101 (Earphone jack)
AEP, UK, CET, IT, AR, HK, SP model
t
C&SA, MX, TW model
t
KH102 (Speaker output)
+
8
CFM-20
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
AM Section
Function switch (S101)
: AM
Volume
: MIN
0dB=1
µV
set
test tape
WS-48B
(3kHz, 0dB)
WS-48B
(3kHz, 0dB)
digital frequency
counter
counter
J101 (Earphone jack)
AEP, UK, CET, IT, AR, HK, SP modelt
C&SA, MX, TW model t KH102 (Speaker output)
Speaker output:12
Ω
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)
AEP, UK, CET, IT, AR, HK, SP modelt
C&SA, MX, TW model t KH102 (Speaker output)
Speaker output:12
Ω
Earphone jack:8
Ω
set
+
level meter
J101 (Earphone jack)
AEP, UK, CET, IT, AR, HK, SP modelt
C&SA, MX, TW model t KH102 (Speaker output)
Speaker output:12
Ω
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
11
11
CFM-20
SECTION 4
DIAGRAMS
4-1. BLOCK DIAGRAMS
• 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
ANT1
CT2
CT1
CV1
CV2
CF1
CF2
ECM101
M101
SP101
J101
F901
HRP101
HE101
RV101
T1
L5
L1
L2
J901
CT4
CT3
CV3
CV4
D903
D104
D101
D103
S501
SP101
L4
FM
TELESCOPIC
ANTENNA
SPRAKER
SPRAKER
QUAD
AM RF IN
FM RF OUT
BAND SEL
FM OSC
AM OSC
DET OUT
FM RF IN
MIX OUT
FM IF IN
AM 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
VOLUME
BIAS
BIAS
LINE
OUT
IN
POWER
IC1
IC101
AC IN
AM
ANTENNA
L3
FM/AM FRONT-END
RADIO
+B
TRANSFORMER
POWER
T901
D901,902
RECT
REG
Q101
RIPPLE
FILTER
FILTER
FERRITE-BAR
TRACKING
COVERAGE
FREQUENCY
MW
FM
COVERAGE
FREQUENCY
TRACKING
FM
AM IF
CT3,L4
CT4,L3
AM
CT2,L1
CT1,L2
FM DET
AC IN
OPR/BATT
+B
+B
RADIO +B
FUNCTION
TAPE/
RADIO OFF
AM
FM
FUNCTION
TAPE/
RADIO OFF
AM
FM
S101-1
S101-2
AEP,UK,CET,IT,AR,HK,SP
MX,C&SA,TW
AEP,UK,CET,IT,AR,HK,SP
AEP,UK,CET,IT,AR,HK,SP
MX,C&SA,TW
AM OSC
12
12
CFM-20
JACK BOARD
POWR BOARD
POWR BOARD
BATT(+) BOARD
MAIN BOARD
1-680-974-
11
(11)
1-680-976-
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
S501
(TAPE POWER)
M101
REEL/CAPSTAN
MOTOR
M
v
SP101
SPEAKER
SP101
SPEAKER
(C&SA,MX,TW)
L3
AM
FERRITE-BAR
ANTENNA
ANT1
FM
TELESCOPIC ANTENNA
DRY BATTERY
SIZE "D"
(IEC DESIGNATION R20)
4PCS, 6V
(AEP,UK,CET,IT,AR,HK,SP)
T901
POWER TRANSFORMER
AC IN
(C&SA,MX,TW)
AC IN
T901
POWER TRANSFORMER
(AEP,UK,CET,IT,AR,HK,SP)
2
3
4
5
6
7
8
9
10
11
A
1
B
C
D
E
F
G
H
R118
C901
C902
J101
KH103
D901
D902
KH901
CNP901
D903
JW901
JW902
D902
D901
C901
C902
F901
J901
CNP901
KH901
JW901
JW902
JW903
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
25
IC1
R121
R122
C134
C7
C2
C3
R2
JC3
IT
EXCEPT
IT
IT
C1
C122
C132
R3
C18
JC1
JC2
C19
C20
R1
C15
C9
JC4
C136
C125
C135
C102
C104
C107
C110
C111
C117
D1
D2
L2
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
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
AM
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.
• 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
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
IC1
B-3
IC101
B-7
Q101
B-5
Ref. No.
Location
POWER BOARD
(AEP, UK, CET, IT, AR,
HK, SP)
D901
E-4
D902
E-4
Ref. No.
Location
POWER BOARD
(C&SA,MX,TW)
D901
G-8
D902
G-8
D903
G-8
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