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FDD412A/B
|
FAULT
a
WRITE GATE-N
(1C24-5)
WRITE DATA-N
(1C24-9)
HEAD ENGAGE-N
(IC16-17)
HEAD ENGAGE-P
(19-11)
HEAD
1 SELECT-N:
WRITE
DATA
is
:
Ss
YES
absent
upon
WRITE>-
ees
GATE inputs
NO
(IC16-18)
or
(1C28-1)|
Repair
damaged
line.
—"WRITE
DATA
line
damaged?
NO
ae
eves
YES
-
FDC
error
is
€ame
in
without
HEAD
ENGAGE?
suspected.
NO
EAD
ENGAGE
NO
output
from
FDC?
YES
Repair
shorted
Peta wi
cable
line
shorted?
WRITE
GATE
YES
YES
YES
line
sad
<came
in
with
.
single sided
disk
_inserted.
NO
FDC
error
is
suspected.
er rone
floppy
<ai
k inserted?
Mount
correct
i
ae
disk.
HEAD 1 SELECT:
YE
line
shorted?
| Repair
shorted
FDC
error
is
per eeet
suspected.
Figs
Bea°
"aul
Replace
PWB Assembly.
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