9. ADJUSTMENTS
AND
VERIFICATIONS
9.1
Motor
Speed Verification (Index Period)
(1) Insert a diskette, run
the
motor,
and clamp. Refer
to
the
index period column
of
Table 8-1.
(2) Step
to
the
specified track.
(3) Connect a frequency
counter
to
the
INDEX signal:
TP7
(4) Check
that
the
frequency counter readings
meet
the
specifications
of
Table 8-1.
9.2 Write Protect Verification
(1)
Check
that
the
exerciser's
write
protect
lamp
goes on and
off
as
a diskette
is
inserted and
removed
as
specified in
the
table
below.
Diskette
with
write
protect
Diskette
with
write
protect
hole open hole closed
OFF
ON
(Not
write
protected) (
write
protected)
9.3 Head Output Verification
Use
a
new
diskette
if
possible
to
identify
head
failure
for
this check.
(1)
Insert a good diskette.
(2)
Run
the
motor.
(3) Step
to
the
track specified in
the
output
level column
of
Table 8-1.
(4) Connect
the
oscilloscope probe
as
specified below.
CH1
CH2
EXT
·:·:II\~~I~I!:II!I:II~~:jll~I~I!\:~:\.I::.I:~1111:!!:.:
Invert channel 2 and select
the
Add mode.
Set vertical
deflection
to
10
mV/division and horizontal
deflection
to
20
ms/division.
(5)
Write
2F
(all "1"s) on
the
entire circumference.
(6) Check
that
the
average
output
level meets
the
specifications
of
Table 8-1.
v - V
max
+ Vmin
average
- 2
If
it
does
not
meet
the
specifications,
refer
to
Item 7
of
the
Trouble Analysis Table.
-7-
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