6300
6.9.2.3 Adjustment Procedure
The
following adjustments are directly referenced in Paragraph 6.9.2.2 and should
be
performed only
as
specified in Paragraph 6.9.2.2.
(1)
Observe
TP20
and set
R69
to
attain a 12v peak-to-peak envelope.
(2)
Observe
TP20
and set
R70
so that the waveform is balanced about ground
(Figure 6-6).
(3)
Observe
TP20
and set
R22
so that the start
of
the waveform is balanced about
ground (Figure 6-6).
(4)
Observe
TP16
and set
R204
so that the start of the waveform is balanced about
ground (Figure 6-7).
(5)
Observe
TP2
and set
R226
so that the amplitude
of
the waveform is 12v peak-to-
peak.
(6)
Observe
TP2
and set
R79
so that the waveform is balanced about ground
(Figure 6-8).
6.9.3 DYNAMIC RETICLE-TO-SCALE PHASE ADJUSTMENTS
Adjustment
of
the reticle is required when the Position mode waveform (Figure 6-9(A))
does not have the crossover point at ground.
CAUTION
ONL Y A
SLIGHT
ADJUSTMENT
OF
THE ANG.LE
BETWEEN THE RETICLE
AND
THE
SCALE
OF
THE
POSITION TRANSDUCER IS
REQUIRED.
OVER-
ADJUSTMENT
WILL CAUSE LOSS
OF
POSITION
TRANSDUCER SIGNALS
AND
ALLOW
THE POSITIONER
TO
GO UNCONTROLLED; PERFORM THE SIGNAL
POLARITY
AND
QUADRA TURE CHECKS IN
PARAGRAPH 6.8.3.
6.9.3.1 Test Configuration
(1)
Prepare the positioner
as
described in Paragraph 6.9.1.
(2)
Establish oscilloscope settings as follows.
• Set Channel 1 sensitivity
to
0.2v per division.
• Connect Channel 1 test probe
to
TP20.
• Set
horizontal sweep rate
to
0.5 msec per division (or
to
a time base where the
waveform can easi
Iy
be
observed).
6.9.3.2 Test Procedure
(1)
Set exerciser for a
000
to
001
track seek.
(2)
Set exerciser to
ON
mode.
(3)
Slightly loosen the horizontal hex-head screw at the base
of
the receiver post.
This will
allow the receiver post to be rotated horizontally.
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