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Procedure
Step
9
Motor speed
(a)
Normal Operation
Operation
(c) and (d), in accordance with R in Fig. 3·1 (a).
Then, obtain the humidity-compensated OFF TRACK
value from the following expression:
The compensated OFF TRACK value
=
OFF TRACK
value + 0.2 (50 - H)(39.5 - 0.1875N - 1.5S)/33.5 ...
(1)
Where;
H: Relative humidity
(%)
N: Track number
S: Side ID number
Side 0: 0
Side 1: 1
The compensated OFF TRACK value should meet the
following formula.
.
'
-20
~
Compensated OFF TRACK value
~
+20 ... (2)
[EX] For R
=
4.5 in the OA-D32V, the apparent OFF TRACK
value is as shown in table 3·1 (d).
Assuming
=
4.5,
H = 60
%,
N = 40, 'al1d S = I, we can obtain the com-
pensated OFF TRACK value as 2.6 from expression (1).
This satisfy the formula.
Fig.
3·1
Cat's Eye Pattern Signal
(b)
2:
3:
4:
5:
6:
7:
S:
9:
2:
3:
~:
5:
6:
7:
S:
9:
0.0
0.1
0.2
0.3
0.4
0.5
0.6
0.7
0.8
0.9
34.5
32.9
31.3
29.S
28.3
26.S
25.4
24.0
22.7
21.4
20.1
IS.9
17.7
16.5
15.3
14.2
13.1
12.0
11.0
9.9
S.9
8.0
7.0
6.1
S.I
4.2
3.4
2.5
1.6
0.8
0.0
-O.S
-1.6
-2.3
-3.1
-3.S
-4.6
-5.3
-6.0
-6.6
-7.3
-S.O
-S.6
-9.3
-9.9
-10.5
-11.1
-11.7
-12.3
-12.9
-13.4
-14.0
-14.5
-15.1
-15.6
-16.1
-16.6
-17.1
-17.6
-IS.I
-IS.6
-19.0
-19.5
-20.0
-20.4
-20.9
-21.3
-21.7
-22.2
-22.6
-23.0
-23.4
-23.8
-24.2
-24.6
-25.0
-25.4
-25.7
-26.1
-26.5
(e)
OA·D32W
0.0
0.1
0.2
0.3
0.4
Q,1
0.6
0.7
0.8
0.9
36.9
35.1
33.4
31.S
30.2
2S.7
27.2
25.7
24.3
22.9
21.5
20.2
18.9
17.6
16.4
15.2
14.0
12.9
11.7
10.6
9.6
S.S
7.5
6.5
5.5
~
3.6
2.7
1.8
0.9
0.0
-0.9
-1.7
-2.5
-3.3
-4.1
-4.9
-5.6
-6.4
-7.1
-7.8
-S.S
-9.2
-9.9
-10.6
-11.2
-11.9
-12.5
-13.1
-13.7
-14.3
-14.9
-15.5
-16.1
-16.6
-17.2
-17.7
-18.3
-IS.8
-19.3
-19.8
-20.4
-20.8
-21.3
-21.S
-22.3
-22.S
-23.2
-23.7
-24.1
-24.6
-25.0
-25.4
-25.9
-26.3
-26.7
-27.1
-27.5
-27.9
-2S.3
(d) OA·D32V
Table
3·1.
Apparent off Track
1. The Motor speed can be measured at TRK35, in TP·5 on
MFD Checker II with an universal counter.
It
should be 100 msec ± 1.5 msec.
-17-
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