Adjustments; Mechanical Adjustment; Electrical Adjustment - Sony CFD-980 Service Manual

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3 7 63 1515 0
4-1.

MECHANICAL ADJUSTMENT

1. Clean the following parts with a denatured-alchool-moistened
swab:
record/playback head
erase head
capstans
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
parts adjusted.
Torque Measurement
Mode
FWD
FWD
back tension
Fast Forward
Rewind
Tape Tension Measurement
TE
L 13942296513
Torque Meter
CQ-403A
www
.
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PRECAUTION
pinch roller
rubber belts
Torque Meter Meter Reading
60g•cm
(0.42 – 0. 83 oz•inch)
CQ-102C
1 – 5g•cm
(0.014 – 0.07 oz•inch)
more than 55g•cm
(more than 0.77 oz•inch)
CQ-201B
more than 55g•cm
(more than 0.77 oz•inch)
Meter Reading
more than 80g
(more than 2.83 oz)
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SECTION 4

ADJUSTMENTS

8
4-2.

ELECTRICAL ADJUSTMENT

TAPE RECODER SECTION
Standard output level
Output Pin
Load impedance
Output signal level
Test tape
Test Tape
WS-48A
P-4-A063
Tape Speed Adjustment
Procedure :
Mode : Playback
test tape
WS-48A
(3kHz, 0dB)
Q Q
3 6 7 1 3
Adjustment Value : normal tape speed
Speed checker
–3.0 to 3.0%
Frequency difference between the beginning and the end of the
tape should be within 3% (90Hz).
Adjustment Location :
u163
.
— 15 —
2 9 9 4 2 8
HP OUT
0.25 V (–10dB)
Signal
3kHz, 0dB Tape speed adjustment
6.3kHz, –10dB Head azimuth adjustment.
32 Ω
set
1 5 0 5 8 2 9 9 4
J302 (phones)
Digital frequency counter
2,910 – 3,090Hz
Tape speed adjustment
control inside motor
m
co
9 9
1dB = 0.775V
32 Ω
Used for
speed checker
LFM-30 or
digital frequency
counter
+
–
2 8 9 9