Sony CFM-20 (serv.man2) Service Manual ▷ View online
6
CFM-20
•
DIAL POINTER SETTING
1
2
5
7
Cabinet (front)
Pointer
Cabinet (front)
ECM101
Set the leads from microphone(ECM101)
as shown in the figure.
as shown in the figure.
Set Pointer to "Cabinet
(front)" as shown in the
figure.
(front)" as shown in the
figure.
4
Set the right side edge
of Pointer to the center
of three scratched lines
on Back plate.
of three scratched lines
on Back plate.
3
Screws
6
Turn knob (tuner) fully in the
direction of the arrow as shown
in the figure.
direction of the arrow as shown
in the figure.
Cabinet (rear) ASSY
Cabinet (front)
(+BVTP 3X10)
Pointer
Back plate
Note : Follow the installation procedure in the numerical order given.
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
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