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Teac MT-20D-IO - Page 153

Teac MT-20D-IO
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4-3-13
Check
of
ISV
(1)
(2)
Articles
to
be
used
(a)
Speed
tape
(b)
Oscilloscope
(c)
SOA
(d)
DC
power
supply
(+12
V.
+5
V)
Check
procedure
(a)
Connect
SOA
in
accordance
with
Item
4-2-5.
and
set
the
POWER
switch
to
the
PSA
side
(it
is
not
required
to
connect
a
check
cable
C).
(b)
Load
the
speed
tape
on
MTU.
(c)
Wind
the
tape
nearly
in
the
winding
center.
(d)
Connect
the
oscilloscope
to
J4-17
on
the
PCBA
Drive
Control.
(e)
Key
in
"0"
to
SOA.
The
tape
is
wound
forwards.
Measure
the
deviation
width
(Fig.
431)
of
the
waveform
at
J4-17
as
shown
in
Fig.
431.
Tri~ger
-rr--
Deviation
width
(%)
J I n I I I I r
4th
riS~
ofwav:form
\.,/
from
trlgger
pOlnt
I ' , , , I "
'I
o
50
100%
Express
the
deviation
width
of
the
4th
rise
of
waveform
from
the
trigger
point
in
percentage.
defining
the
10
divisions
of
the
horizontal
axis
as
100%.
Adjust
the
waveform
with
the
TIME/DIV
of
the
oscilloscope
set
to
variable.
Fig.
431 ISV
measuring
method
-
4060
-

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