Velocity Command Gain Adjustment; Dsu Installed - HP 7925D Service Manual

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Note: With the DELAY potentiometer set to
MAX, a maximum delay between seek
operations is introduced.
g. On the DSU, press the START pushbutton and allow
the disc drive to perform a series of random seek
operations.
h. After several seek operations have been performed,
rotate the DELAY potentiometer fully counter-
clockwise to MIN.
Note: With the DELAY potentiometer set to
MIN, a minimum delay between seek
operations is introduced.
Alignment and Adjustment
1.
If one of the assemblies has been replaced, allow the
disc drive to run for at least one minute, otherwise
allow the drive to run for at least 5 seconds.
j. On the DSU, press the STOP pushbutton.
3-11. VELOCITY COMMAND GAIN
ADJUSTMENT
The only electrical adjustment requiring the use of the
DSU is the velocity command gain adjustment. To perform
this adjustment, proceed as follows:
a. Exercise the disc drive as outlined in paragraph 3-10.
7301-168
Figure 3-4. DSU Installed
3-5