Sharp FDD-412A - Page 95

Ck)
Example of defective envelope (1) (1)
FDD412A/B
Example of defective envelope (2)
Table 5.2
Cyclic Once per revolution
Several times per
revolution
Noncyclic
Changes at ramdom
Changes in fixed
area
Remedied by rewriting
Example
of
abnormal
data
cycle
(m)
Figs 0020 .
Table 5.3
Symptom
Long
data
cycle
|
Same
symptom
on
another
system
device
Normal
on
another
system
device
Not remedied by rewriting
Symptom
|
Amplitude
Variation
Others
Probable
Cause
SaETeRpond
ne
to
Item 5.2.4
Changes in Checks on
speed device
Head detached
Faulty writing
Dent, etc.
With FM method:
I-5,1-6 .-
TI-4
Checks on
input device
I-1,1-2,1-3,II-1
(O0..... ) A> 8 us
COD so a x ) A> 4 us
With MFM method:
(1010..... ») A> 4&uUs
(100100...) A > 3 Us
CU Nessie estes ) A> 2 us
Probable Cause
Error at writing
II-2,II-3,11~4,
TII-5
Error at reading
11-2, 11-3,11I-4,
TTI-5