Fostex G16 - Page 43

lissajous waveform.
2) Tangency adjustment
If the head gap does not face the tape correctly as shown in the drawing below, a correct
recording and/or playback level cannot be obtained.
And also there is considerable deterioration occurs in the high frequency range.
Load a Reproduce Alignment tape, Fostex Model 9200 and playback the 12.5KHz section.
And then, adjust the tangency screws as shown in the Fig. 4.13 so that the reading of
played back 12.5KHz level will be the maximum. This is the point where the head gap
faces the tape correctly.
3) Height/Tilt adjustment
The head height/tilt adjustment can be done with the two screws shown in the Fig. 4.13.
3)-l) Height adjustment
Incorrect adjustment of the head height will result in degraded Erasure, Crosstalk
etc. The adjustment is as follows
Erase head . . . Head core edge slightly protrudes beyond the tape edge.
R/P head .... Head core edge slightly recessed within the tape edge (core edge
cannot be seen).
3) — 2) Tilt adjustment
Tilt adjustment means that the head surface is so adjusted as to be parallel with the
tape surface.
Improper tilt adjustment will cause a difference in pressure being applied to the
head between the upper and lower edge of the tape.
Consequently, the head is apt to become worn into a trapezoid form.
Therefore, the head must be so adjusted that the head surface is parallel with the
tape guide adjacent to it.
4) Azimuth phase adjustment *
Load a Reproduce Alignment Tape, Fostex Model 9200 and playback the Head Azimuth
and Frequency Response section of the test tape.
The Azimuth and Phase can be adjusted with the adjusting screw as shown in the Fig.
4.13.
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