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– 9 –
SECTION 4
ADJUSTMENTS
4-2. ELECTRICAL ADJUSTMENTS
TAPE RECORDER SECTION
1. The adjustments should be performed in the publication. (Be sure
make playback adjustment at first.)
2. The adjustment and measurement should be performed for both
L-CH and R-CH.
r
Switch position
MEGA BASS : OFF
TONE
TONE
: mechanical center.
VOLUME
: as required.
Standard Output Level
Output terminal
HP OUT
load impedance
32Ω
output signal level
0.25V ( – 10 dB)
Test Tape
Type
Signal
Used for
WS-48A
3kHz, 0dB
Tape Speed Adjustment
P-4-A063
6.3kHz, –10dB
Head Azimuth Adjustment
0dB=0.775V
Tape Speed Adjustment
Procedure :
Procedure :
Mode : Playback
set
test tape
WS-48A
(3kHz, 0dB)
WS-48A
(3kHz, 0dB)
32
Ω
speed checker
LFM-30 or
digital frequency
counter
LFM-30 or
digital frequency
counter
2
jack (J301)
– +
Adjustment Value :
Speed checker
Digital frequency counter
±
2%
2,940 – 3,060Hz
Frequency difference between the beginning and the end of the tape
should be within 1.5% (45Hz).
Adjustment Location :
tape speed adjustment
control inside moter
control inside moter
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 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
4. After the adjustments, apply suitable locking compound to the
parts adjusted.
Torque Measurement
Torque
Torque Meter
Meter Reading
Forward
CQ-102C
30 – 70 g • cm
(0.42 - 0.97 oz• inch)
Forward
back tension
back tension
CQ-102C
1.0 – 6.0 g • cm
(0014 - 0.083 oz• inch)
Fast Forward
CQ-201B
more than 60g • cm
(more than 0.84oz• inch)
Rewind
CQ-201B
more than 60g • cm
(more than 0.84oz• inch)
Tape Tension Measurement
Tension Meter
Meter Reading
CQ-403A
more than 90g
(more than 3.18 oz)
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