Table of Contents
Advertisement
A>B
B
Ax
100
B>A
A
8
x
100
Fig. 9.2 Radial Alignment Waveforms (CATS EYE)
Note: Alignments on sides 0 and 1 are adjusted at the factory. If they are misaligned, adjust them to
meet the specifications of Table 8.1.
•
DAD (Dynamic Alignment Diskette)
(4) Watch the output waveforms for sides 0 and 1. They should appear as shown in Fig. 9.3.
(5) Measure the timing levels A 1 to A4 and B 1 to B4 in Fig. 9.3, and calculate the lobe ratio from
the following formulas.
~A> ~B:
x
100%
~A< ~B:
x
100%
(6) The lobe ratio calculated by the above formulas should meet the specifications on item 3 of
Table 8.1.
(7) If the above requirement is not met, loosen the two mounting screws for the stepper motor,
adjust.
(8) Seek from track 0 to track 40 and from track 79 to track 40, and confirm that the adjustment
has been completed.
(9) After the radial adjustment, be sure to confirm track 00 sensor adjustment 9.8 and head
carriage limiter 9.9.
Note: An alignment instrument for 3.5-inch FDDs permits accurate and easy adjustment
because the lobe ratio is displayed on the instrument.
Index
burst
waveform
Azimuth
waveforms
L~
r
A,
8,
j
-
r-H
In
u
20ms
Radial alignment waveforms
'
e,
B,
A.
A,
s.
A,
70msJ
._,_,
-
120m.J
170ms
Fig. 9.3 Alignment Waveform (DAD)
-9-
Advertisement
Table of Contents
