Index Burst
Fig. 5.5 Index Timing
5.8
Track
00
Sensor Adjustment
(1)
Set
the oscilloscope
as
follows:
Set horizontal deflection to 1 ms/division.
CH1
: ZP
EXT : SP
(2)
Step
between specified tracks
at
in the FLAG item of Table 4.1 .
(Turn the seek delay switch on the
exerciser
to
adjust
1 2ms seek).
(3)
Loosen the track sensor screw and adjust
until the waveform on the oscilloscope
appears
as
shown in Fig.
5.6.
ADJUST
A: B
TO 1 : 1
Fig.
5.6
Track
Waveform
5.9 Limiter
Verification
(1)
Seek to track 0.
(2)
Write 2F
data on track
0,
and measure
read level.
(3)
Seek
to
track -1,
and check that the head
just touches the limiter.
(4)
Check
that, when the RECAL switch
on the exerciser is
pushed ON, the head
returns
to
track
and that the 2F
output level
is the
same as that measured in
Step
(2).
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