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M-640V/645V/647V
SECTION 3
MECHANICAL ADJUSTMENTS
PRECAUTION
1. Clean the following parts with a denatured-alcohol-moistened
swab :
record/playback/erase head
rubber belts
2. Demagnetize the record/playback/erase head with a head
demagnetizer.
3. Do not use a magnetized screwdriver for the adjustments.
4. The adjustments should be performed with the rated power
supply voltage unless otherwise noted.
Power supply voltage: 3 Vdc
TAPE SPEED switch : 2.4 cm
Torque Measurement
Mode
Torque Meter
Forward
CQ-103M
Fast Forward
CQ-201M
Rewind
CQ-201M
Tape Tension Measurement
Mode
Tension Meter
Forward
CQ-403M
8
pinch roller
capstan
Meter Reading
0.49 – 1.27 mN • m
(5 – 13 g • cm)
(0.07 – 0.180 oz • inch)
more than 2.95 mN • m
(more than 30 g • cm)
(more than 0.42 oz • inch)
more than 2.95 mN • m
(more than 30 g • cm)
(more than 0.42 oz • inch)
Meter Reading
more than 20 g
(more than 0.28 oz)
SECTION 4
ELECTRICAL ADJUSTMENTS
Specified voltage: 3 V (DC)
Test Tape
Type
Signal
S-2-A030
3 kHz, – 20 dB
Head Azimuth Adjustment
WS-24
3 kHz, – 10 dB
Tape Speed Adjustment
WS-12
Record/Playback/Erase Head Azimuth Adjustment
Setting:
[VOL] control
: mechanical mid
[TAPE SPEED] switch : 2.4 cm/s
[VOR] switch
: OFF
Procedure:
1. Mode: Playback
test tape
S-2-A030
(3 kHz, –20 dB)
set
2. Turn the head azimuth adjustment screw to obtain the
maximum reading on level meter.
Note: Several peaks may appear, but the maximum.
Adjustment Location:
First remove the cover (AZ).
Remove the
cover (AZ).
Tape Speed
Used for
(cm / s)
2.4
2.4
1.2
level meter
16 Ω
+
–
[EAR]
jack (J101)
head azimuth
adjustment screw
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