Read Sony CFD-S27 (serv.man2) Service Manual online
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4-2. ELECTRICAL ADJUSTMENTS
TAPE RECORDER SECTION
Standard Output Level
Output terminal
HP OUT
load impedance
32
Ω
output signal level
0.25V (–10dB)
Test Tape
Type
Signal
Used for
WS-48A
3kHz, 0dB
Tape Speed Adjustment
0dB = 0.775V
Tape Speed Adjustment
Procedure :
Mode : Playback
1. Adjust the screw (Tape Speed Adjustment control inside motor)
for 2,970 – 3,030 Hz reading on the digital frequency counter.
2. Frequency difference between the beginning and the end of the
tape should be within 1.5% (45Hz).
Adjustment Location :
SECTION 4
ADJUSTMENTS
4-1. 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 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
30 – 70 g•cm
(0.42 – 0.97 oz•inch)
Forward
CQ-102C
1.5 – 5.5 g•cm
Back Tension
(0.020 – 0.076 oz•inch)
Fast Forward
CQ-201B
more than 60 g•cm
(more than 0.84 oz•inch)
Rewind
CQ-201B
more than 60 g•cm
(more than 0.84 oz•inch)
Tape Tension Measurement
Torque Meter
Meter Reading
CQ-403A
more than 100g
(more than 3.53 oz)
set
test tape
WS-48A
(3kHz, 0dB)
WS-48A
(3kHz, 0dB)
32
Ω
digital frequency
counter
counter
J301 (phones)
Tape speed adjustment
control inside motor
control inside motor
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