- 35 -
3-4. Phase Adjustment
1. Play back an alignment tape (NM3KE6 : 859C339O50).
2. Preset the tracking.
3. Loosen the Screws D and E shown in the Fig. 3-4-1.
Insert a screw driver (+) into the Hole in the MAIN
PLATE ASSY (Part
A
) and move the A/C PLATE to
the right and left to set the amplitude level of the FM
Waveform to maximum.
4. Tighten the Screws D and E.
5. Play back an alignment tape [NMX : 859C568O60].
6. Confirm the Missing Portions of the FM Waveform and
Audio Waveform are as shown in the Fig. 3-4-2.
7. If the Missing Portions differ from the Fig. 3-4-2,
repeat the procedure 3.
8. Adjust the tracking so that the amplitude level of the
FM Waveform will be at the maximum. And set the
oscilloscope so that the Waveform will be 5 divisions
of the oscilloscope.
9. Preset the tracking.
10. Confirm that the FM Waveform on the oscilloscope is
4.8 divisions or more.
11. If the FM Waveform is below 4.8 divisions, preset the
tracking and repeat steps 3~10.
12. Push the A/C HEAD to the right and left (in the
direction of A-A' in the Fig. 3-4-1) and release it.
Confirm that the amplitude of the FM Waveform does
not change, compared to before the A/C HEAD was
shifted.
13. If the amplitude level of the FM Waveform changes,
check the set position of the A/C HEAD. If the A/C
HEAD is installed incorrectly, correct the position
according to the Item 2-8. "A/C HEAD UNIT" and 3-3.
"A/C HEAD Adjustment", and then repeat this item
from the beginning.
14. Alternately load and unload the tape several times.
Confirm that the amplitude of the FM Waveform does
not change.
3-5. Tape wrinkle check
1. Confirm that there is no wrinkle at the lower edge of
GUIDE POLE(TU) in PB/FS mode with T-160 tape
beginning and ending.
2. Confirm that there is no wrinkle at the upper edge of
GUIDE POLE(TU) in RS mode with T-160 tape
beginning and ending.
Missing Portion
FM Waveform
Audio Waveform
Output
a
A
A'
b
Screw D
Tape
Part
Screw E
A
Fig. 3-4-2
Fig. 3-4-1
Tape
GUIDE POLE (TU)
GUIDE PIN (TU)
Fig. 3-5
