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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.)
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
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)
32
Ω
digital frequency
counter
J301 (phones)
Tape speed adjustment
control inside motor
