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 : T1

Set 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
817-363CE

40TRK

40TRK

40TRK

JU-252A
JU-253A




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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