Advertisement
Put a
meter cassette in the cassette holder of the unit,
torque
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 point@shown in Figure 3-1,
by using a tension gauge (500 g) so that it will come off the
capstan. Then, slowly 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 g to 400 g.
3. If the reading is outside the range of 300 g to 400 g, replace
the pressure spring of the pinch roller.
1. Connect instruments as shown in Figure .3-2.
2. Adjust the head azimuth adjusting screw so that the output
signal will have maximum waveform.
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.
1. Connect instruments as shown in Figure 3-4.
2. Set the mode selector switch at tape, the volume control
knob at max.
3. Playback a test tape (TEAC, MTT-118, 1 kHz, 250 pWb/
4. See that the electronic voltmeter is reading about 130mV.
MECHANICAL ADJUSTMENT
F O R W A R D A N D
ELECTRICAL ADJUSTMENT
Record/Playback
Head
MTT-118
Head
inch Roller Pressure
ELECTRONIC
VOLTMETER
FREQUENCY
OSCILLOSCOPE
Advertisement
