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9.6 Azimuth Verification
(1) Insert an alignment diskette. Seek to the track specified in the azimuth column of Table 8.1.
(2)
Set the oscilloscope in the same conditions as in
8.3,
and set horizontal deflection to
0.5
ms/division.
(3) Measure as shown below.
(4)
Confirm that the measured value meets the specifications in the azimuth column of Table 8.1.
B
c
B
c
c
D
A
B
A
D
A
Azimuth 0 waveforms
D
CaseofB>C
B-C
Azimuth ,.
B=o
x (A)
CasaofB<C
Azimuth .. CC - 8
x (A)
-A
9.7 Index Burst Verification
3.S·inch (A) : CE - 30'
OAD-15'
Fig. 9.4
Azimuth Waveforms
s:2s~fricn
(AL:
12'
(1) Insert an alignment diskette. Seek to the track specified in the
1/8
column of Table 8.1.
(2) Set the oscilloscope time base as follows:
s:;is;inch:
50
µs/division
3.5-inch:
1 ms/division
(3) Check that the time from oscilloscope start to the first data pulse meets the
1/8
specifications of Table 8.1. (DAD
system)
(4) If the specifications are not met, adjust as follows. (No adjustment necessary for 3.5-inch models)
•
Loosen the index detector mounting screws enough to free the assembly.
• Adjust the timing to 200 ± 200 µsec.
•
Retighten the screw.
• Check the timing again.
I•
Index. Burst .,
1
Fig. 9.5
Index Timing
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