Read Sony CFD-S39 Service Manual online
– 13 –
2
jack (J301)
set
32
Ω
test tape
WS-48A
(3 kHz, 0 dB)
WS-48A
(3 kHz, 0 dB)
digital frequency
counter
counter
Tape speed adjustment
TAPE SECTION 0 dB = 0.775 V
• Standard Output Level
Output terminal
HP OUT
load impedance
32 Ω
output signal level
0.25 V (–10 dB)
• Test Tape
Type
Signal
Used for
WS-48A
3 kHz, 0 dB
tape speed adjustment
Tape Speed Adjustment
Procedure:
Mode: playback
Mode: playback
PRECAUTION
1. Clean the following parts with a denatured-alcohol-moistened
swab :
record/playback head
pinch roller
erase head
rubber belts
capstan
idlers
2. Demagnetize the record/playback head with a head demagne-
tizer. (Do not bring the head magnetizer 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
supply voltage unless otherwise noted.
Torque Measurement
Mode
Torque Meter
Meter Reading
Forward
CQ-102C
25 – 60 g • cm
(0.35 – 0.83 oz • inch)
Forward
CQ-102C
1 – 5 g • cm
back tension
(0.014 – 0.069 oz • inch)
Reverse
CQ-102RC
25 – 60 g • cm
(0.35 – 0.83 oz • inch)
Reverse
CQ-102RC
1 – 5 g • cm
back tension
(0.014 – 0.069 oz • inch)
Fast
CQ-201B
55 – 140 g • cm
Forward
(0.76 – 1.94 oz • inch)
Rewind
CQ-201B
55 – 140 g • cm
(0.76 – 1.94 oz • inch)
Tape Tension Measurement
Mode
Tension Meter
Meter Reading
Forward
CQ-403A
more than 170 g
Reverse
CQ-403R
(more than 6.00 oz)
SECTION 5
ELECTRICAL ADJUSTMENTS
SECTION 4
MECHANICAL ADJUSTMENTS
1. Playback the test tape in the FWD playback mode.
2. Confirm that the digital frequency counter reading indicates a
2. Confirm that the digital frequency counter reading indicates a
value in the range of 2,940 to 3,060 Hz at tape top.
3. If the specification is not satisfied, adjust variable resistor of
motor until the frequency counter reading is as close to 3,000
Hz as possible at the FWD tape top.
Specification : 2,910 to 3,090 Hz
Hz as possible at the FWD tape top.
Specification : 2,910 to 3,090 Hz
4. Frequency difference between the beginning and the end of the
tape should be within 1.5% (45 Hz).
Adjustment Location:
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