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9.4
Output
Modu lat
ion
Verification
Modulation:
M
is calculated by
the following formula
.
Vmax-Vmin
M(%)
..
)(100
using
the
value
obtained
in
9 .3
,
and
check
that
the
Vma)(+Vmin
calculated value is
20%
or
less.
_ _ _ _ _
_ _____
~~;:::~:.::i2====Ma
l(imum
Voltage Valve:
Vma)(
-------~----~-
----"""
7%
Average
Voltage
Minimum Voltage Valve: Vmax
Fig. 9
.1
Modulation
9.5
Radial
Alignment Adjustment
Introduction
This adjustment Is normally
not
necessary.
rf the mounting screws for
the
stepper
motor loosen,
Of
if parts become defective, or
it
a
wmpatibility
error
occurs, check and
readjust
according to
the
following procedure.
Ste~
(4)
to
(9)
should
be
performed regardless of the type,
CE
or
DAD
alignment diskette
used.
Use
an alignment
'
diskette suitable to
the type of
FDD
to be
adj usted
according to table
3. 1.
(
1)
Insert
an
alignmen
t
diskette.
CAUTION:
Be
sure to 1"lIe th,
,
Ullnm..,t disk.n,
under
room
conditions
tor 20 minutes
b,tor' ,
dju,'m,nt.
(2
)
Step
to the
track
specified
in
the
Radial
alignment column
of
Ta
ble
8.1.
(3)
Leave
the
oscilloscope in
the
same
condition as mentioned
in
section
9.3
.
•
Cats Eye
System
S.lS-inch
(4)
Check
the
output
waveforms for sides
0
and
1.
They
should appear
as
in
Fig.
9.2.
(5) The
two waveform
s
shou ld
appear
in
the amplitude
ra tio in the
R/A
column of Table
8.
1 or
better.
(6)
If
the specified ratio
is
not satisfied, loosen the two mounting
screws
for the stepper motor.
(n
Move the
stepper
motor along the
base by hand until
the
two waveforms assume
approximately the same
ampl
i·
tude, and retig hten
the
mou nting
screws.
(See Fig. 9.2.)
(8)
Step the
head
outward
(track
0
)
and
inward (track
40
or 79),
and
confirm that the adjustment
has
been
completed.
(9)
After the
rad
ial
adjustment,
be su re
to confirm
trac
k
00 senso
r
ad justment
9,8 and
carriage
limi ter
9.9
.
-
8 -
•
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