Adjustments; Mechanical Adjustments; Electrical Adjustments - Sony CFD-V15 Service Manual

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. 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
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
0dB = 0.775V
Tape Speed Adjustment
Procedure :
Mode : Playback
test tape
WS-48A
(3kHz, 0dB)
set
SECTION 5

ADJUSTMENTS

pinch roller
rubber belts
Meter Reading
30 – 70 g•cm
(0.42 – 0.97 oz•inch)
1.5 – 5.5 g•cm
(0.020 – 0.076 oz•inch)
more than 60 g•cm
(more than 0.84 oz•inch)
more than 60 g•cm
(more than 0.84 oz•inch)
Meter Reading
more than 100g
(more than 3.53 oz)
HP OUT
32 Ω
0.25V (–10dB)
Used for
Tape Speed Adjustment
speed checker
LFM-30 or
digital frequency
counter
32 Ω
J301 (phones)
Adjustment Value :
Speed checker
–1 to +1%
Frequency difference between the beginning and the end of the tape
should be within 1.5% (45Hz).
Adjustment Location :
TUNER SECTION
AM Section
Function switch : AM
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
400Hz signal.
Output level : as low as possible
set
– 8 –
Digital frequency counter
2,970 – 3,030Hz
Tape speed adjustment
control inside motor
Put the lead-wire
antenna close to
the set.
0.01 µ F
telescopic
antenna
terminal
level meter
32 Ω
J301 (phones)