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@® RECORD/PLAYBACK
SENSITIVITY ADJUSTMENT
(See Figure 16-1)
1. Insert the normal (non-recorded) tape into the unit
2. Connect
CR
oscillator
to
the
External
Microphone
socket
J101A
(or J101B),
and
apply
signal
(1kHz,
—60dB) to the unit.
3. Place the unit in Record
mode. Set the Record
Mode
switch SW202 to manual position.
4. Adjust the record volume control VR103A (or VR103B)
so that the 4th LED of the level meter will light up.
5. Reproduce the tape recorded in steps 3 and 4.
6. Adjust the semi-variable resistor VR105 (or VR106) so
that the 4th LED of the level meter will light up.
=
RECORD AMPLIFIER
BIAS CURRENT/BIAS
OSCILLATOR
FREQUENCY
CHECK
(See Figure 16-2)
1. Connect an Electronic Voltmeter between the test point
TP101 (or TP102) and TP103.
2. Set
the tape
selector
switch
SW203
and
SW204
to
Normal
position
and
Beat Cancel switch SW105
to A
position.
3. Place the unit in record mode, and adjust the bias oscilla-
tor frequency adjusting variable coil L107 so that the
bias oscillator frequency, on the oscilloscope's Lissajou's
figure, is 85 kHz.
4. Adjust
the step-up
coil L103
(or L104)
so that the
Electronic Voltmeter's reading is 14V.
Exernal Microphone
1kHz,1V
Figure 16-1
Record mode
R107
Record/
{or R108)
Playback Head
E.V
[>—TP101 (or TP102)
Record!
Playback Head
Osciltoscope
Audio
generator
Figure 16-2
Oscilioscope
Figure 16-3
MECHANISM
ADJUSTMENT
1.
2.
Set the unit in the playback mode.
roller
Pinch roller pressing spring
Figure 16-4
PLAYBACK/FAST-FORWARD/REWIND
TORQUE
mz
=
aaa
—
MEASUREMENT
(See Table 16-1)
Mode
Torque measurement
Measurement
1. Load the unit with a torque measurement cassette.
f
cassette
ee
2. The torque measurement for each mode should be as shown
Playback
j
TW-2111
35 — 60 g-cm
|
.
a
a
i
1
in Table 16-1,
| Fast-forward
__
TW-2231 |
_|_ 90 — 135 g-em
| Rewind
|
TW-2231
|:
90 — 135 g-cm
Table 16-1
-16—
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