8
M-740V
PRECAUTION
1. Clean the following parts with a denatured-alcohol-moistened
swab :
record/playback/erase head
pinch roller
rubber belts
capstan
2. Demagnetize the record/playback/erase 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. The adjustments should be performed with the rated power
supply voltage unless otherwise noted.
Power supply voltage : 3 Vdc
TAPE SPEED switch : 2.4cm
Torque Measurement
SECTION 3
MECHANICAL ADJUSTMENTS
Record/Playback/Erase Head Azimuth Adjustment
Setting:
VOL control
: mechanical mid
TAPE SPEED switch : 2.4cm/s
VOR switch
: OFF
FAST PB switch
: OFF
Procedure:
1. Mode : Playback
Adjustment Location :
Test Tape
SECTION 4
ELECTRICAL ADJUSTMENTS
2. Turn the adjustment screw to obtain the maximum reading on
level meter.
Note:
Several peaks may appear, but the maximum.
First remove the cover (AZ).
EAR jack (J102)
set
16
Ω
test tape
S-2-A030A
(3 kHz, –20 dB)
level meter
Remove the cover (AZ)
Head azimuth
adjustment screw
(FWD)
(REV)
Tape Tension Measurement
Mode
Forward
Reverse
Fast Forward
Rewind
Torque Meter
CQ-102M
CQ-102MR
CQ-201M
CQ-201M
Meter Reading
0.49 to 0.98 mN • m
(5 to 10 g • cm)
(0.07 to 0.140 oz • inch)
0.49 to 0.98 mN • m
(5 to 10 g • cm)
(0.07 to 0.140 oz • inch)
more than 2.94 mN • m
(more than 30 g • cm)
(more than 0.42 oz • inch)
more than 2.94 mN • m
(more than 30 g • cm)
(more than 0.42 oz • inch)
Mode
Forward
Reverse
Torque Meter
CQ-403M
CQ-403MR
Meter Reading
more than 2.45 mN • m
(more than 25 g)
(more than 0.35 oz)
more than 2.45 mN • m
(more than 25 g)
(more than 0.35 oz)
Type
S-2-A030A
WS-24
Signal
3 kHz, – 20 dB
3 kHz, – 10 dB
Used for
Head Azimuth Adjustment
Tape Speed Adjustment
Tape Speed
(cm/s)
2.4
1.2/2.4