MECHANICAL ADJUSTMENT
F O R W A R D A N D
Put a
torque
meter cassette in the cassette holder of the unit,
and see that the measured torque in each mode is normal as
shown in Table 3.
1. Place the unit in playback mode.
2. Push the pinch roller, at the
in Figure 3-1,
by using a tension gauge (500
so that it will come off the
capstan. Then,
release the tension until the pinch
roller hits the capstan again (i.e., the pinch roller is about to
rotate again). Check, then, the tension gauge is reading
300 to 400
Roller
3. If the reading is outside the range of 300 to 400 replace
the pressure spring of the pinch roller.
inch Roller
1. Connect instruments as shown in Figure
2. Adjust the head azimuth adjusting screw so that the output
signal
have maximum waveform.
ELECTRONIC
VOLTMETER
Connect instruments as shown in Figure 3-3.
2. Put a screwdriver (for high-frequency use) into the hole of
the motor, and adjust the variable resistor so that the
output frequency is 2955 Hz to 2980 Hz on frequency
counter.
Record/Playback
Head
FREQUENCY
ELECTRICAL ADJUSTMENT
1. Connect instruments as shown in Figure 3-4.
2. Set the mode selector switch at tape, the volume control
knob at max.
OSCILLOSCOPE
V O L T M E T E R
3. Playback a test tape
MTT-118,
250
MTT-118
0
prerecorded).
4. See that the electronic voltmeter is reading about
Head
