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JVC RC-S22 C - Tuner Alignment

JVC RC-S22 C
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RC-S22
C/W/JW/WH/L/LB/LD
Tuner
Alignment
BASIC
CONDITIONS
Power
source
of
the
receiver
:
DC4.5V,
EXT.
Jack
6V
Load
resistance
of
the
receiver
:
50mW
0.63V/8Q
Modulation
of
SSG
:
400
Hz,
30%
Description
1.
AM
IF
Alignment
1-1
Conditions
of
the
receiver
(1)
Power
source:
DC4.5V
(When
the
power
is
supplied
directly
to
the
tuner
in
the
receiver,
the
voltage
should
be
adjusted
to
the
proper
level
which
shall
be
required
by
the
tuner.)
RADIO
AM
Minimum
gain
position
Near
the
minimum
capacity
position
where
no
signal
comes
in.
(2)
Function
switch
position:
(3)
Band
select
switch:
(4)
Volume
control:
(5)
Variable
capacitor:
1-2.
Connection
of
Sweeper
and
the
receiver
(1)
Tuner
input:
(2)
Tuner
output:
1-3.
Aligning
position:
1-4
Alignment
(Waveform):
Positive
side
to
TP-1
Positive
side
to
TP-2,
Negative
side
to
TP-4
T3,
T4
Adjust
AM
1|.F.T.
(above
mentioned
aligning
position)
so
that
maximum
and
symmetrical
waveform
can
be
obtained.
In
this
case,
the
wavehead
should
be
appeared
at
the
center
marker
(455
kHz)
on
the
scope
of
Sweeper.
es
2.
FM
IF
Alignment
2-1
Conditions
of
the
receiver
(1)
Power
source:
(2)
Function
switch
position:
(3)
Band
select
switch:
(4)
Volume
control:
(5)
Variable
capacitor:
2-2.
Connection
of
Sweeper
and
the
receiver
(1)
Tuner
input:
Positive
side
to
TP-5
(2)
Tuner
output:
Positive
side
to
TP-2,
Negative
side
to
TP-4
Note:
a)
Attach
a
capacitor
(30
pF)
and
a
resistor
(30
k{&2)
in
series
to
the
positive
side
cable
which
shall
be
led
from
Sweeper
input.
b)
Attach
a
capacitor
(30
pF)
and
a
resistor
(100
kQ2)
in
series
to
the
positive
side
cable
which
shall
be
led
from
Sweeper
output.
2-3
Aligning
position:
Same
as
mentioned
in
item
1-1
RADIO
FM
Minimum
gain
position
Near
the
minimum
capacity
position
where
no
signal
comes
in.
a)
IF
Waveform:
T1
b)
Discriminate
Waveform:
T2
(“S"’
curve
waveform)
Adjust
the
discriminate
coil
(T2)
so
that
“S"
curve
waveform
may
be
changed
to
IF
waveform
as
shown
in
the
figure
(right).
After
the
above,
adjust
T1
so
that
max.
sensitivity
and
symmetrical
IF
waveform
can
be
obtained
on
the
scope
of
Sweeper.
Adjust
the
discriminate
T2
again
so
that
the
above
symmetrical
IF
waveform
may
be
changed
to
balanced
‘‘S’’
curve
waveform.
2-4
=
Alignment
(Waveform):
a)
IF
Waveform:
b)
Discriminator
Waveform:
3.
AM
RF
Alignment
3-1
Conditions
of
the
receiver
(1)
Power
source:
Same
as
mentioned
in
item
1-1
(2)
Function
switch
position:
RADIO
(3)
Volume
control:
50
mW
(4)
Tone
control:
High
(5)
Variable
capacitor:
Refer
to
the
following
list
shown
in
item
3-4.
3-2
Conditions
of
SSG
(1)
Modulation:
Refer
to
the
basic
condition.
(2)
Frequency:
Refer
to
the
following
list
shown
in
item
3-4.
(3)
Output
level
of
the
attenuator
in
SSG:
Approx.
50
mW
3-3
Power
output
measuring
position:
Speaker
terminals
No.
1534
7

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