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Akai AS-8100

Akai AS-8100
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FM
STEREO
FM
SIGNAL
MODULATOR
GENERATOR
(MSG-
2110)
(MSG
-278G)
OUTPUT
TERMINATION
PAD
AS-8100
SPEAKER
(MODEL
2151B)
7.
SEPARATION
ADJUSTMENT
1)
2)
3)
4)
5)
6)
(See
Fig.
11)
Set the
FM
Stereo
Modulator
Pilot
Signal
19
KHz
to
10%
modulation
and
the
main
signal
(L
+
R)
to
400
Hz,
90%
modulation.
Connect
this
composite
signal
(ratio
9:1)
to
the
EXT
MOD
Terminal
of
the
FM
Signal
Generator.
Set
the
FM
Signal
frequency
to
98
MHz
and
set
this
output
level
to
66
dB,
and
connect
to
the
FM
Antenna
Terminal
of
Model
AS-8100.
Connect
a
high
sensitivity
V.T.V.M.
or
an
8Q
more
than
45W
dummy
load
resistor
to
the
various
speaker
output
terminals.
Set
Tone
Control
to
“Flat”
position
and
then
set
the
tuning
dial
to
98
MHz
and
speaker
output
to
20
dB.
Turn
Separation
Adjustment
Volume
VR-3
(1
KB)
fully
clockwise.
Set
the
FM
Stereo
Modulator
to
right
channel,
and
adjust
the
cores
of
“L,”
and
“L,”
coils
so
that
the
indication
of
V.T.V.M.
(connected
to
left
channel)
is
minimum.
Then
turn
VR-3
counter-clockwise
to
position
at
which
the
V.T.V.M.
indication
is
minimum.
Set
FM
Stereo
Modulator
to
left
channel
and
adjust
the
cores
of
“L,”
and
“L,”
so
that
the
indication
of
V.T.V.M.
(connected
to
right
chan-
nel)
is
minimum.
Then
adjust
VR-3
so
that
the
V.T.V.M.
indication
is
minimum.
If
separation
is
not
better
than
35
dB,
repeat
the
above
adjustments
again.
Avoid
turning
the
coil
cores
too
much
when
making
this
second
adjust-
ment.
If
the
FM
Signal
Generator
output
has
been
decreased
to
26
dB
(+3
dB),
check
to
see
whether
the
stereo
indicator
lamp
has
been
extinquished.
8.
1)
2)
3)
4)
OUTPUT
(MODEL
164)
V.LV.M.
Fig.
11
"AM-FM
RADIO
IF
GENESCOPE
(MODEL
MSW-72IC)
Fig.
12
AM
IF
CIRCUIT
ADJUSTMENT
(See
Figs.
12
and
13)
Adjust
the
V-Gain
Volume
to
obtain
a
2
cm
amplitude
of
0.3V
p-p
AM
FM
Radio
IF
Gene-
scope
calibration
voltage
on
screen,
and
set
the
Genescope
output
to
60
dB.
2cm
pr
een
Fig.
13
Connect
Genescope
output
to
Test
Point
(TP)
and
Genescope
Input
to
Point
(8)
(AF
Output).
Set
Mode
Switch
to
“AM”
and
reception
fre-
quency
to
about
1630
kHz.
Adjust
cores
of
IFT,
T,;,
T,,
and
T,;
of
AM
IF
Amp
P.C.
Board
so
that
the
waveform
(Fig.
13)
level
is
maximum
and
center
frequency
is
455
kHz
(Center
frequency
differs
according
to
country.
Adjust
according
to
country’s
center
frequency).

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