JVC JR-S300 Service Manual

6.
FM/AM
Tuner
Alignment
Procedures
Alignment locations for FM/AM Tuner sections
Tab 129
L103
R147
(Red)
L102
(Org)
Fay DIN Socket
(Blu
Play
TC5
Rec.
Out
Jacks
Variable Capacitor (Rear View)
Fig. 12
TFC-17 (FM/AM Tuner & Equalizer
Amp. C.B. Ass’y)
6-(1) FM Section
Discriminator, Center Meter & Distortion
1.
NOaRAN
Connect
an
RF
generator,
1kHz
modulation
and
75kHz
deviation,
to
the
antenna
terminals
on
the
rear
panel
through
a
dummy
antenna.
Connect
an
oscilloscope,
distortion
meter
and
VTVM
to
the
Rec.
Out
Jacks
on
the
rear
panel.
Tune to a frequency where there is no broadcasting.
Adjust the bottom core of T103 so that the center meter indicates ‘’0” (zero).
Set the generator to 98MHz.
Set the dial pointer to 98MHz.
Adjust
the
top
core
of
T103
so
that
the
distortion
is
minimized
at
a
value
less
than
0.4%.
Tracking and Sensitivity
Low Frequency
A PWN>
Connect
an
RF
generator
to
the
antenna
terminals
on
the
rear
panel
through
a
dummy
antenna.
Set
the
RF
generator
to
88MHz,
a
modulation
of
1kHz
and
a
deviation
of
75kHz,
to
provide
an
input
of
2uV.
Connect
a
VTVM
and
an
oscilloscope
to
the
Rec.
Out
Jacks
on
the
rear
panel.
Set the dial pointer to 88MHz.
Adjust
three
coils
L103,
L102
and
L101
in
the
tuning
gang
to
maximize
the
output.
High Frequency
6.
7.
8.
9.
JR-S300
No. 2363
Set
the
RF
generator
to
108MHz,
a
modulation
of
1kHz
and
a
deviation
of
75MHz,
to
provide
an
input
of
2uV.
Set
the
dial
pointer to 108MHz.
Adjust
the
FM
trimmers
TC5,
TC3
and
TC1
in
the
tuning
gang
to
maximize
the
output.
Repeat
these
high
and
low
frequency
adjustments
alternately
until
maximum
sensitivity
is
obtained.

JVC JR-S300 Specifications

General

Brand	JVC
Model	JR-S300
Category	Stereo Receiver
Language	English