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Teac MT-20D-IO - Page 143

Teac MT-20D-IO
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4-3-10
Check
and
adjustment
of
BOT/EOT
hole
sensor
(1)
Articles
to
be
used
(a)
Hole
sensor
test
tape
(b)
Conventional
type
screwdriver
small
size
(c)
SOA
(d)
DC
power
supply
(+12
V,
+5
V)
"90
ips"
(2)
Check
and
adjustment
procedures
(a)
Connect
SOA
in
accordance
with
Item
4-2-5,
and
set
the
POWER
switch
to
the
PSA
side.
(b)
Load
the
hole
sensor
test
tape
on
MTU.
(c)
Wind
the
tape
1
to
2
seconds
past
the
BOT
hole
in
the
forward
direction.
(d)
Key
in
"B7".
The
tape
is
wound
forward
and
reversely.
(e)
The
hole
sense
time
is
indicated
to
the
display
DATA
1
of
SOA
during
the
reverse
winding
and
to
the
display
DATA
2
during
the
forward.
(f)
Check
if
both
hole
sense
times
are
more
than
400
microseconds
each.
(g)
Key
in
"B8"
to
wind
the
tape
forward
and
reversely.
(h)
The
voltage
level
is
displayed
to
the
display
DATA
1
of
SOA
during
hole
detection,
and
to
th
display
DATA
2
during
non
hole
detection.
(i)
Check
if
the
voltage
level
at
hole
detection
is
less
than
0.35
V
and
that
at
non
hole
detection
is
more
than
4.55
V.
(j)
If
the
result
of
the
check
in
steps
(f)
and
(i)
are
out
of
the
specifications,
make
the
following
adjustment.
(k)
Connect
the
(+)
terminal
of
the
digital
voltmeter
(DCV)
to
TP13
on
the
PCBA
Drive
Control,
and
the
(-)
terminal
to
TP18.
(1)
Key
in
"B8".
The
tape
is
wound
reversely
and
forward,
and
then
stops.
(m)
Keep
the
tape
stopped,
and
adjust
R41
on
the
PCBA
Drive
Control
until
the
reading
voltage
of
the
digital
voltmeter
is
equal
to
the
voltage
entered
on
the
label
of
the
hole
sensor
test
tape.
-
4050
-

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