Read Sony CFM-20 (serv.man2) Service Manual 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)
+
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