— 15 —
SECTION 4
ADJUSTMENTS
Torque Meter
CQ-403A
Meter Reading
more than 80g
(more than 2.83 oz)
4-2.
ELECTRICAL ADJUSTMENT
Standard output level
Test tape
Tape Speed Adjustment
Procedure :
Mode : Playback
Adjustment Value : normal tape speed
Frequency difference between the beginning and the end of the
tape should be within 3% (90Hz).
Adjustment Location :
HP OUT
32
Ω
0.25 V (–10dB)
Output Pin
Load impedance
Output signal level
Test Tape
WS-48A
P-4-A063
Used for
Tape speed adjustment
Head azimuth adjustment.
Signal
3kHz, 0dB
6.3kHz, –10dB
4-1.
MECHANICAL ADJUSTMENT
PRECAUTION
1.
Clean the following parts with a denatured-alchool-moistened
swab:
record/playback head
pinch roller
erase head
rubber belts
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
Tape Tension Measurement
Meter Reading
60g
•
cm
(0.42 – 0. 83 oz
•
inch)
1 – 5g
•
cm
(0.014 – 0.07 oz
•
inch)
more than 55g
•
cm
(more than 0.77 oz
•
inch)
more than 55g
•
cm
(more than 0.77 oz
•
inch)
Mode
FWD
FWD
back tension
Fast Forward
Rewind
Torque Meter
CQ-102C
CQ-201B
1dB = 0.775V
32
Ω
test tape
WS-48A
(3kHz, 0dB)
set
speed checker
LFM-30 or
digital frequency
counter
J302 (phones)
+
–
Digital frequency counter
2,910 – 3,090Hz
Speed checker
–3.0 to 3.0%
TAPE RECODER SECTION
Tape speed adjustment
control inside motor
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