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FDD412A/B
(2)
(3)
Synchroscope
settings
CH
MODE:
ADD
INVERT
VOLT:
100mV/div.
TIME:
(a)
(b)
(c)
(d)
(e)
2
(j)
(k)
2
(1)
(m)
(n)
2
(p)
(q)
2
(s)
(t)
(w)
. Picture
list
5 us % 20 ms/div.
Differential
observation
FM method
:
(00) 16 track,
(FF)ig
gap
(normal)
MFM method:
(00)i¢
track,
(4E)ig
gap
(normal)
FM method
:
(00)i¢
track,
(00);
data
(normal)
FM method
:
(4C)ig
track,
(FF) i¢
data
(normal)
Drop-out
(example)
(abnormal )
Example
of defective
envelope
(wavy)
(abnormal )
(example)
Defective
data
cycle
(example)
Different
amplitude
between
ID,
and Data
parts
(example)
Abnormal
flux
change
(example)
Noise
(abnormal)
(abnormal)
(abnormal )
(abnormal)
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