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Akai 1710W

Akai 1710W
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Vil.
AMPLIFIER
ADJUSTMENT
1.
ADJUSTMENT
OF
RECORDING
BIAS
FREQUENCY
(Fig.
1)
a.
Put
on
the
resistor
10
or
50
ohms
in
series
with
the
Bias
Head
and
connect
the
Vertical
Input
Terminal
of
the
Oscilloscope
to
points
(a)
and
(b).
b.
Feed
in
the
sine
wave
signal
from
an
Audio
Frequen-
cy
Oscillator
to
the
Horizontal
Input
of
the
Oscillo-
scope
and
tune
the
Dial
of
the
Audio
Frequency
Oscillator
until
the
Oscilloscope
displays
a
circular
or
linear
pattern.
c.
If
it
reads
60
K
Hz
+
5
K
Hz,
the
Recording
Bias
Frequency
is
correct.
d,
If
it
is
not
correct,
it
may
be
adjusted
by
inserting
.
another
condenser
(C-11)
value
560
PF.
REC/P.B
HEAD
OSCILLATOR
CIRCUIT
oS
OSCILLOSCOPE
AUDIO
FREQUENCY
OSCILLATOR
Fig.
1
2.
ADJUSTMENT
OF
RECORDING
BIAS
VOLTAGE
(Fig.
2)
a
.Connect
the
V.T.V.M.to
the
point
(A)
and
(B),
then
read
the
figure
on
the
meter
of
the
V.T.V.M.
b.
If
it
reads
AC
35
V
£5
V,
the
Recording
Bias
Voltage
is
correct.
c.
If
it
not
correct,
it
may
be
adjusted
by
inserting
another
resistor
(R-17,
18)
value
68
K
Ohms.
3.
ADJUSTMENT
OF
ERASING
BIAS
VOLTAGE
(Fig.
3)
a.
Connect
the
V.T.V.M.to
the
point
(A)
and
(B),
then
read
the
figure
on
the
meter
of
the
V.T.V.M.
b.
If
it
reads
AC
47
V
+
10
V,
the
Erasing
Bias
Voltage
is
correct.
c.
If
it
not
correct,
it
may
be
adjusted
by
inserting
ano-
ther
regulator
coil
(L2,
L3)
value
22
mH.
L2
22mH
Cl4@
250P
Ci2
|OOP
=
RI7
68K
t
AW
3100P
RI8
68K
es
Lt
68mH
Cl
RET
F
|

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