Sharp FDD-412A - Page 92

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)