Vector 4 - Page 153

VECTOR GRAPHIC, INC.
3.3.1 Adjust Read/Write Head Alignment
In the following activity, oscilloscope should still be set up according to
specifications described in Step 2 of Section 3.2, above.
1.
2.
e
Locate the three module cap screws and one cam screw indicated in
Using 7/64" Allen wrench, turn three module cap screws 1/2 turn
counterclockwise,
Using DISKTEST commands, make sure that drive reads from head noted
as furthest out of alignment in Section 3.2. Check cat's eye pattern on
oscilloscope.
In the following step, difference between larger and smaller cat's eye patterns -
cannot exceed 25% of larger pattern.
4,
e
Using standard screwdriver, turn cam serew slowly back and forth, until
both cat's eye patterns are approximately equal.
Using 7/64" Allen wrench, tighten three module cap secrews. Check cat's
eye pattern, to make sure that drive did not lose alignment when
tightening module cap screws.
3.3.2 Adjust Track 00 Stop Screw Setting
The Track 00 Stop Secrew acts as a retainer, to keep the read/write head from
seeking a position farther out on the disk than Track 00. Refer to Exhibit
[II-6 for location information.
In the following activity, the oscilloscope is assumed to be connected
according to the same specifications declared in Section 3.2.
a1 3-8
Make sure that alignment diskette is mounted in drive to be tested.
Using DISKTEST commands, set head to read from track 00.
Using 0.050" Allen wrench, turn track 00 stop screw two full turns
counterclockwise. Note output amplitude on oscilloscope.
While observing oscilloscope, slowly turn track 00 ‘stop screw clockwise
until output amplitude begins to decrease, then stop.
Turn track 00 stop screw counterclockwise until amplitude stops
increasing, then turn track 00 stop screw one additional 1/8 turn.
7200-0001 09-01-82