ページを印刷するI.
Read/Write Head Radial Alignment
A.
Insert Dysan 224.
Note:
Before using the Dysan Alignment Diskette,
it should be allowed to acclimate to the en-
vironment in which you intend to use it for
as long as it was removed from that environ-
ment or up to 24 hours, whichever occurs
first.
B.
Step the Head Carriage to track 16.
C.
Sync an oscilloscope on "Index". Set time base
to 20 msec/division. This should display one
revolution.
D.
Connect two probes and set the vertical deflec-
tion in such a fashion as to display the read sig-
nal at the output of the differential amplifier.
Ground the probes to the drive Printed Circuit
Board (PCB). Set the inputs to AC, Add and in-
vert one channel.
E.
The lobes displayed should be within 70% am-
plitude of each other. (See Figure 1) If the lobes
do not fall within this specification, continue to
Step F.
F.
Loosen the screws which will allow radial ad-
justment of the Head Carriage. (It is recom-
mended that the stepper motor or servo system
be electrically detented while making this
adjustment.)
G.
Adjust the Head Carriage in or out as necessary
to get the lobes to be equal in amplitude.