Sony CFM-20 (serv.man2) Service Manual ▷ View online
5
CFM-20
2-5. BATT (+) BOARD, POWER BOARD
(AEP, UK, IT, CET, HK, SP, AR model)
(AEP, UK, IT, CET, HK, SP, AR model)
2-6. BATT (+) BOARD, POWER BOARD
(C&SA, MX, TW model)
(C&SA, MX, TW model)
Note on attaching power cord
On attaching power cord, first,
turn it around the projection on
"Cabi, rear" as shown in the
figure and secure it with "PWB,
cord retainer".
turn it around the projection on
"Cabi, rear" as shown in the
figure and secure it with "PWB,
cord retainer".
2
4
6
8
3
Screw
(+ BVTP 3X10)
(+ BVTP 3X10)
1
Claw
Power board
Cord, power
Batt (+) board
PWB, Cord retainer
White
Red
5
7
Screws
(+ BVTP 3X10)
(+ BVTP 3X10)
Remove solder
(two places)
(two places)
Cabinet (rear)
1
2
4
Claw
3
Screws
(+ BVTP 3X10)
(+ BVTP 3X10)
Power board
Batt (+) board
Red
White
Cabinet (rear)
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
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