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JVC JR-S300 Service Manual

JVC JR-S300
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Muting
Level
Connect
a
VTVM
and
an
oscilloscope
to
the
Rec.
Out
Jacks.
Set
the
RF
generator
to
108MHz,
a
modulation
of
1kHz
and
a
deviation
of
75kHz,
to
provide
an
input
of
10uV.
Turn
R135
clockwise
and
remember
the
point
at
which
the
muting
ceases
operating.
Turn
R135
counterclockwise
slightly
so
that
the
output
level
drops
by
1dB.
Attenuate
the
output
of
the
RF
generator
to
2dB
from
10uV
of
Step
2
and
check
that
the
muting
is
still
operating.
CY
un
Multiplex
1.
Set
a
stereo
signal
generator
as
follows:
Modulation
frequency
1,000Hz,
Deviation
pilot
7.5kHz,
Main
and
Sub.
67.5kHz.
Connect
its
output
of
an
RF
generator.
Connect
the
RF
generator
to
the
antenna
terminals
through
a
dummy
antenna.
Connect
a
VTVM,
an
oscilloscope
and
a
distortion
meter
to
the
Rec.
Out
Jacks.
Set
the
RF
generator
to
98MHz
and
an
output
of
ImV.
Set
the
dial
pointer
to
98MHz.
Connect
a
frequency
counter
to
Tab
No.
129.
Switch
off
the
pilot
signal
of
the
stereo
modulator.
Adjust
R147
so
that
the
frequency
counter
indicates
19kHz
(+0.01kHz).
20S
GON
Stereo
Separation
9.
Switch
the
selector
of
the
stereo
modulator
to
left
channel
modulation.
10.
Adjust
R163
so
that
the
output
of
the
right
channel
is
minimized.
11.
Switch
the
selector
of
the
modulator
to
right
channel
modulation.
12.
Adjust
R163
so
that
the
output
of
the
left
channel
is
minimized.
13.
Set
R163
to
average,
if
the
separation
of
right
and
left
are
different.
Note:
Keep
the
muting
pushbutton
out
during
this
adjustment
procedure
of
stereo
separation.
6-(2)
AM
Section
Tracking
and
Sensitivity
Low
Frequency
1.
Connect
an
RF
generator
to
the
antenna
terminals
on
the
rear
panel,
set
this
to
600kHz
with
30%
modulation
at
400Hz.
2.
Connect
an
AC
VTVM
and
an
oscilloscope
to
Rec.
Out
Jacks
on
the
rear
panel.
3.
Set
the
dial
pointer
to
600kHz.
4.
Adjust
Osc.
transformer
L109
and
the
ferrite
bar
antenna
to
maximize
the
output
signal.
High
Frequency
5.
Set
the
RF
generator
to
1,400kHz
with
30%
modulation
at
400Hz.
6.
Set
the
dial
pointer
to
1,400kHz.
7.
Adjust
the
trimmers
TC4
and
TC2
in
the
AM
tuning
gang
so
that
the
output
signal
is
maximized.
8.
Repeat
these
high
and
low
frequency
adjustments
alternately
until
maximum
sensitivity
is
obtained.
JR-S300
—~10—
No.
2363

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JVC JR-S300 Specifications

General IconGeneral
BrandJVC
ModelJR-S300
CategoryStereo Receiver
LanguageEnglish

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