Read Sony CFM-A50 Service Manual online
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SECTION 4
ADJUSTMENTS
4-1. MECHANICAL ADJUSTMENTS
PRECAUTION
1. Clean the following parts wit2h a denatured-alcohol-moistened
swab :
record/playback head
pinch roller
erase head
rubber belts
capstan
2. Demagnetize the record/playback head with a head demagne-
tizer. (Do not bring the head demagnetizer close to the erase
head.)
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
Torque
Torque Meter
Meter Reading
Forward
CQ-102C
20 – 55 g•cm
(0.28 – 0.76 oz•inch)
Forward
CQ-102C
2 – 5 g•cm
Back Tension
(0.028 – 0.069 oz•inch)
Fast Forward
CQ-201B
more than 50 g•cm
(more than 0.7 oz•inch)
Rewind
CQ-201B
more than 50 g•cm
(more than 0.7 oz•inch)
Tape Tension Measurement
Torque Meter
Meter Reading
CQ-403A
more than 70g
(more than 2.47 oz)
4-2. ELECTRICAL ADJUSTMENTS
TAPE RECORDER SECTION
FUNCTION switch
: TAPE (RADIO OFF)
SLOW PLAYBACK switch
: OFF
EASY LISTENING ADJUSTMENT switch : OFF
VOLUME
VOLUME
: MIN
Standard Output Level
Output terminal
Earphone
Speaker
load impedance
32
Ω
3.2
Ω
output signal level
0.25V (–10dB)
0.775V (0dB)
Test Tape
Type
Signal
Used for
WS-48A
3kHz, 0dB
Tape Speed Adjustment
0dB=0.775V
Record/Playback Head Azimuth Adjustment
Procedure :
1. Playback Mode
1. Playback Mode
2. Rotate the screw to adjust level meter reading to the maximum.
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.
Adjustment Location :
set
test tape
P-4-A100
(10kHz, -10dB)
P-4-A100
(10kHz, -10dB)
32
Ω
level meter
J101 (Earphone jack)
adjustment screw
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