Fig. 5.7 Asymmetry Waveform
(Asymmetry Wave form might be reversed up-and-down from model to model )
5.10 Asymmetry Verification
(1) Insert a data diskette.
(2) Step to the track specified in the symmetry item of Table 4.1.
(3) Set the oscilloscope as follows:CH1 : RD
CH2 : T1Set time base to 1ms/division and vertical deflection to 0.2 v/division.
(4) Write 1 F.
(5) A read wave form is displayed on the oscilloscope as shown in Fig. 5.7.
(6) Confirm if it satisfies the value as shown in Table 4.1.
(Asymmetry wave form might be reversed up-and-down from model to model).
ALIGNMENT CASSETTE
3.5 inch Alignment Diskette
TP1 | P/N | Index Burst | Azimuth | Radial Alignment | MODEL |
135 DAD 135 CE |
JU-01AA |
40TRK |
40TRK |
40TRK |
JU-252A |
MEASUREMENT ITEMS TABLE 4.1
Item |
Parameter |
JU-252A, 253A | |
TRK | Value | ||
1 | Index Period | 40 | 200 ± 2ms |
2 | Output Level | 79 | 80mV or more |
3 | Radial Alignment Reference (DAD) Reference (CE by 817-363CE) |
40 | ± 35mm (29% or more) (42% or more) |
4 | Azimuth | 40 | ±24' |
5 | Index burst | 40 | 3± 1.7ms |
6 | Flag 0 | From track 0 to track 1 and back |
TROO (TROO: Low, Tr1 : Height) |
7 | Limiter | -1 | Recalibrate and return to 0 |
8 | Asymmetry | 79 | <= 700ns |
10
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