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6.6.3 ACTUATOR ALIGNMENT (Diskette)
The Alignment Diskette is used to perform this procedure. Install jumper from U26
Pin 7 to ground.
a. Alignment Diskette 421-51W shall be preconditioned by allowing it to :reach
room temperature for one hour.
b. Install the alignment diskette.
!
CAU~ION
1
The alignment diskette is for read only.
Extreme caution should be used to assure
this diskette is not written on.
c. step to track 38 (00100110) and perform a read. (No data is recorded on track 38.
The tester or system requirements should be noted; refer to tester or system
instructions for operation.)
d. Connect Channel 1 of scope to TP3 on the PWA and Channel 2 to TP4 on the PWA.
e. Connect the external sync probe to index at TP14 on PWA.
f. Set up the scope as follows:
Channell: volts/div to: 0.1 volts/div
Channel 2: volts/div to: 0.1 ~olts/div (inverted)
Channell: input to: AC
Channel 2: inputs to: AC
Vertical Mode to: Add
Slope (Sync) to: Positive
Trigger Source to: External
Trigger Coupling to: Low Frequency (High Frequency Reject)
Trigger Mode to: Normal
Time Base to: 20 msec/div
77834769-K
NOTE
Scope trace after trigger level is adjusted for
repetiti ve trace should display an envelope of
data "Cateyes" consisting of two lobes (refer
to Figure 6-8 A). If no such pattern can be
displayed, manually turn the stepper motor
shaft extending from the rear of the stepper
motor one-quarter turn either way to locate
pattern. Then proceed to step "h".
6-21
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