9. ADJUSTMENTS AND VERIFICATIONS
9.1 Motor Speed
Adjustment
and Confirmation !Index Period)
(1
} Insert a diskette, run the
motor
,
and
damp
, Ref
er
to
the
in
de
x period
column
of
Table 8.1 for
th
e a
pp
lica
bl
e
model.
(2 )
Step
to
the specified track.
(3
)
Connect
a fre
qu
en
cy co
unter
to
the
INDE
X signal.
. 5.
25
,-inch : TP7
3.5·inch: IX
(4) Check that the fr
equency
coun
te
r readings
meet
the
specifications in the t
ab
le.
(5)
Adjuum
e
nt
5.25 -
inch
: Turn the spe
ed
contro
l po
tent
i
ometer
on
the
motor control circuit bo
ard
unt
il
the
spedf
i
c:at
isons
are
sat
is
fied.
3.5
-i
nch
: No adjus
tment
9.2 Write Protect Verification
(1)
Check that the exe
rc
iser's write protect lamp go
es
on and
oft
as
a media is inserted and removed as speci
fi
ed
in
the
table
below.
Media wi
th
write
pr
ot
ect
Media wi
th
write p
ro
te
ct
hole
ope
n hole clos
ed
S.2.S-inch OFF-
ON
3.5·inch ON
OFF
9.3
Head
Output
Verificat
i
on
Use
a new diske
tte
i1
possible
to
id
entity
head
failure
fo
r
thi~
check.
(1) Insert a
good
diskette.
(2)
Run the
motor
.
(3)
Step
to
the
t
ra
ck specified
in
the o
utpu
t leve l
column
of Table 8.1 .
(4) · C
onnect
th
e oscillos
cope
probe
as
specified below.
C
H1
CH2
E
XT
S.2S
·i
nc
h l
Pl
TP2
TP7
3.5·"
lC
h
T1
T2
"
UN
DE
X}
Invert
channe
l 2
and
select the
Add
mode.
Set
vertical deflection
to
10
mV/div isi
on
and horizontal
deflection
to
20
ms/division.
(5) Write
2F
(a
ll
ones)
on
the
entire
circumference.
(
In
caseot
a double·sided FDD, repeat it
on
sides 0 and 1 using SIDE
SE
LECT.)
(6) Check
that
the avtrage
out
put
level meets the specificatio
ns
of
Table 8.1. If it does
not
meet
the
s
pe
c
if
ication
s,
refer
to
Item 7
of
the
Trouble Analy
sis
Table.
- 7 -
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