4. OUTLINE
OF
MAINTENANCE
• The
following
tools ate required
for
maintenance
of
a Floppy Di
sk
Dri
ve.
(FOO)
4.1 A
lign
ment
D
iskett
e
Alignment
diskette
is
used
for nead
actuator
ali
gnment
and index sensor adjustment .
•
Ad;tiume
nts
(R
efer to
table
8.
1)
(1)
Specify
an
appIJc
able model
fr
om
label
8.1.
CInd
make a readlwrite head radial adjustment at a specified
tr
ac
le
.
(SidesQ,l)
(2)
Make
an
iodell
timing
adjustment
at
a specified Irack. (Sides
O.
1)
(3)
Make
iH
I
azimuth
measurement
at
a specifi
ed
tracl
e (Sides 0, 1)
CAUTION
Do
not
write
when
using
alignment
diskette.. Check
that
write
protect
sens
or
is
properly
operating
.
4.2 Exerciser
The
exerciser enables
you
to
make
all
ad
justments
an
d inspections necessary for an FDD. Its functions include the
follow
ing:
(1) Seek
increment
or
alternate
tracks
(2) Read
(but
no
da
ta
compare)
(3) Write 1 F
or
2F
(AIIO'sor "
s)
(4) Head load
(S.2S-
i
nch
FDD
with
optional
head
loader)
(5) Recalibration
to
track
00
The exerciser has switches
and
indicators
to
execute
a specified
function
.
5.
DIAGNOSTIC PROCEDURES
5.1 Error Symptom R
e<o
gnition
Er
ro
rs
tha
t
occur
because
of
the wrong
operating
procedure,
wrong
programming,
or
use
of
a defective diskette, or
soft
erro
rs
due
to
external
causes, such
as
contaminated
air and
random
electrical noise, are
often
attributed
to
a drive
failure
or
maladjus
tment.
Unless a visual inspection of
the
dri
...
e reveals
an
evident
auembly
fault or
II
defect, always confirm errors with another good
diskette, and another known good
dr
i
...
e.
5.2
Soft
E
rror
D
etectio
n
and
C
orrectio
n
Soft errors are normally caused by
th
e following:
(1) Contamination between read
I write heads and diskette.
This
kind of cont.}:,lination can be easily ehminated
by
the liner
in
the
d
is
ke
tt
e.
(2)
Random
el
ect
r
ic
al noise, normally a f
ew
mi
croseco
nds
or
less.
(3)
Small
defects
in
wri
tten
data
a
nd
l or
tfaclr.
not detected
du
ri
ng
write oper
at
ion
may cause roft errors dur
in
g read.
(4)
F
aulty
grounding
of
the
dr
....
e or
host
system can also cause a
soft
er
ro
r.
(5) Wrong
motor
s
peed
is
another
cause
of
soft errors.
Take the
following
st
ep
s
on
the
controller
side
to
recover from
the
soft
errors
ment
ioned above.
(1) Read
the
track again
ten
tim
es
or
unt
il
th
e
data
is
recover
ed
.
(2)
If
Step
(1) above fails
to
recover
the
data
, access the
adjacent.
Then
return
the
head
to
the
origin
al
track.
(3) Repe
at
Step
(11
.
(4) Any
error
that
cannot
be
corrected
by
th
e above
procedure
is irrecoverable.
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