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9.
ADJUSTMENTS AND VERIFICATIONS
9.1 Motor Speed Adjustment and Confirmation !Index
Period)
(1
}
Insert
a diskette,
run
the
motor,
and
damp,
Refer
to
the
inde
x
period
column
of
Table 8 .1
for
the
applicabl
e
model
.
(2
)
Step
to
the specified
track.
(3) Connect
a
fre
quency counter
to
the
INDE
X
signal.
.
5.25
,
- inch
:
TP7
3.5·inch:
I
X
(4
)
Check
that
the frequency
counte
r
read
ings meet the specifications
in
the
table.
(5
)
Adjuument
5.25
-inch:
Turn the speed
control
potentiometer on the
motor
control circuit board unt
il
the spedfic:atisons are satisfied
.
3
.5-inch:
No ad
justment
9.2 Write Protect
Verification
(1)
Check that the
exerciser's
write
protect lamp
goes
on
and oft
as a media
is
inserted
and removed
as
speci
fi ed in the
table
below.
Media
w ith
write
protect
Media
with
write
protect
hole
open
hole
closed
S.2.S-inch
OFF-
ON
3.5·inch
ON
OFF
9.3
Head Output Verification
Use
a
new disk ette i1
possible
to ide
ntit
y head fa
ilure
fo
r
thi~
check.
( 1)
Insert a
good
diskette.
(2)
Run the
motor.
(3) Step to the
track specified in
the
outpu
t leve
l
column of
Table 8.1
.
(4)
·
Connect the oscilloscope
probe
as
specified
below.
CH1
CH2
EXT
S.2S ·inch
l
Pl
TP2
TP7
3.5·"lCh
T1
T2
"
UN
DE X}
Invert
channel
2
and select
the Add
mode.
Set
vertical
deflection
to
10
mV/
div ision and
horizontal deflection to
20
ms/d ivision
.
(5)
Write
2F
(all
o nes) 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
output level
meets the
specificati ons
of
Table
8.1.
If
it
does
not
meet the
specifications,
refer to Item
7 of
the Trouble
Analysis
Table.
-
7
-
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