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FDD fails to read the
floppy disk contents.
Check the supply voltage.
y
y
Replace drives A and B of
the FDD signal cable CN7.
Insert the floppy disk and
check if it is read with
drive B.
The floppy disk is not
read with drive A, but
read with drive B.
(Defective drive
AI
Replace the drive
A unit.
Check again according to
the check out procedure.
5-6
y
N
Replace the
in-use lamp.
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