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Teac MT-20D-IO - Page 165

Teac MT-20D-IO
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"D/CAS" "SCSI"
4-3-21
Check
and
adjustment
of
VFO
operating
point
(1)
Articles
to
be
used
(a)
Work
tape
(b)
Digital
voltmeter
(c)
Conventional
type
screwdriver
Small
size
(d)
"D/CAS"
SOB
(e)
"SCSI"
SOD
(f)
DC
power
supply
(+12
V,
+5
V)
"D/CAS"
(2)
Check
and
adjustment
procedure
(a)
Connect
SOB
in
accordance
with
Item
4-2-6.
(b)
Prior
to
the
start
of
this
item
of
check
and
adjustment,
allow
a
warmup
time
of
10 min
or
more.
Cc)
Load
the
work
tape
on
MIU.
Cd)
Connect
the
(+)
terminal
of
the
digital
voltmeter
(DCV)
to
TP4
on
the
PCBA
interface
control.
and
its
(-)
terminal
to
GND.
Ce)
Key
in
"DOF".
"D51".
"Bi",
and
"AA"·.
The
tape
is
wound.
(f)
Check
if
the
voltage
at
TP4
is
within
the
range
of
2.25
V
to
2.75
V
(center
value:
2.50
V)
during
the
forward
winding.
(g)
When
the
measured
value
in
step
(f)
is
out
of
the
specification,
adjust
R12
on
the
PCBA
Interface
Control
until
the
voltage
at
TP4
is
set
to
2.5
V.
- 4072 -

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