Sharp FDD-412A - Page 86

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.