Adjustments; Mechanical Adjustments; Electrical Adjustments - Sony CFD-V3 Service Manual

CFD-V3/V7/V7L

5-1. MECHANICAL ADJUSTMENTS

PRECAUTION
1. Clean the following parts with a denatured-alcohol-moistened
swab :
record/playback head
erase head
capstan
2. Demagnetize the record/playback head with a head demagne-
tizer. (Do not bring the head demagnetizer close to the erase
head.)
3. Do not use a magnetized screwdriver for the adjustments.
4. The adjustments should be performed with the rated power sup-
ply voltage (9V) unless otherwise noted.
Torque Measurement
Torque Torque Meter
Forward CQ-102C
Forward
CQ-102C
Back Tension
Fast Forward CQ-201B
Rewind CQ-201B
Tape Tension Measurement
Torque Meter
CQ-403A

5-2. ELECTRICAL ADJUSTMENTS

TAPE RECORDER SECTION
Standard Output Level
Output terminal
load impedance
output signal level
Test Tape
Type Signal
WS-48A 3kHz, 0dB
Tape Speed Adjustment
Procedure :
Mode : Playback
test tape
WS-48A
(3kHz, 0dB)
set
Adjustment Value : 3,000Hz
Standard Value : 2,940 - 3,060Hz
Frequency difference between the beginning and the end of the tape
should be within 1.5% (45Hz).
10
SECTION 5

ADJUSTMENTS

pinch roller
rubber belts
Meter Reading
1.77 – 5.88 mN•m
(18 – 60 g•cm)
(0.25 – 0.83 oz•inch)
0.1 – 0.49 mN•m
(1.0 – 5.0 g•cm)
(0.014 – 0.069 oz•inch)
4.42 – 9.31 mN•m
(45 – 95 g•cm)
(0.62 – 1.32 oz•inch)
4.42 – 9.31 mN•m
(45 – 95 g•cm)
(0.62 – 1.32 oz•inch)
Meter Reading
more than 60g
(more than 2.12 oz)
0dB = 0.775V
HP OUT
32 Ω
0.25V (–10dB)
Used for
Tape Speed Adjustment
digital frequency
counter
32Ω
J301 (phones)
Adjustment Location : Mechanism deck
Tape speed adjustment
control inside motor
0dB = 1 µV
TUNER SECTION
AM Section
Function switch : AM or LW
Volume : MIN
AM RF signal
generator
30% amplitude modulation by 400Hz
signal.
Output level : as low as possible
FM Section
Function switch : FM
Volume : MIN
FM RF signal
generator
22.5kHz frequency deviation by
1kHz signal.
Output level : as low as possible
set
J301 (phones)
Put the lead-wire
antenna close to
the set.
0.01µF
telescopic
antenna
terminal
level meter
32Ω