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JVC UX-A5 - Tuner Section Adjustment Procedures; IF and Tracking Adjustments for Tuner Bands; FM MPX Confirmation Steps

JVC UX-A5
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H
Adjustment
of
Tuner
Section
AM
IF
Measuring
Condition
and
Main
Adjustment
The
unit
should
not
usually require
adjustment.
Fotiow
the
steps
below
when
adjustment
is
necessary.
[Conditions]
e
Band
select
switch
position
:
e
Reception
frequency
e
Volume
control
¢
Tuner
input
position
¢
Tuner
output
position
AM
:
Set
at
the
highest
frequency
where
no
signal
is
received.
:
Minimum
gain
position
:
Positive
side
to
TP3
:
Positive
side
to
TP6,
Negative
side
to
TP7
[Adjustment]
Adjust
T2
(above
mentioned
adjust
point)
so
that
maximum
and
symmetrical
waveform
Fig.
6-6
can
be
obtained.
In
this
case,
the
wave
head
should
appear
at
the
center
marker
(455
kHz)
on
the
scope
of
sweeper.
The
unit
should
not
usually
require
adjustment.
Follow
the
steps
below
when
adjustment
is
necessary.
[Conditions]
*
Band
select
switch
position
:
¢
Reception
frequency
¢
Volume
control
e
Tuner
input
position
e
Tuner
output
position
{Adjustment]
FM
:
Set
at
the
highest
frequency
where
no
signal
is
received.
Minimum
gain
position
:
Positive
side
to
TP4
:
Positive
side
to
TP6,
Nagative
side
to
TP7
1.
Disconnect
CF3
to
change
waveform
from
S-curve
(Fig.
6-7)
to
single
peak
of
the
waveform
(Fig.
6-8).
2.
Turn
T1
to
shape
waveform
so
that
it
peaks
in
the
center
(10.7
MHz)
of
the
waveform
and
is
symmetrical
in
both
sides.
3.
Connect
CF3
again
and
confirm
that
waveform
returns
to
the
original
(Fig.
6-7).
LW
{Conditions]
Tracking
¢
Band
select
switch
position
:
¢
Tuner
input
[Adjustment]
1,
Adjustment
of
VT
.
Frequency
of
SSG
.
Adjust
L5
to
maximize
output.
.
Frequency
of
SSG
Ouakhwh
Mw
Tracking
°
¢
Tuner
input
[Adjustment]
[Conditions]
Band
select
switch
position
:
1.
Frequency
of
SSG
3.
Frequency
of
SSG
FM
Tracking
°
¢
Tuner
input
position
{Conditions]
Band
select
switch
position
:
[Adjustment
-
UX-5
B/E]
1.
Frequency
of
SSG
[Adjustment
-
UX-5G]
Tuner
input
position
.
Frequency
of
SSG
.
Adjustment
of
VT
.
Frequency
of
SSG
.
Frequency
of
SSG
.
Repeatedly
adjust
L2
and
TC1
Conditions]
Input
position
Input
signal
FM
MPX
Confir-
mation
eeTrnonnpw
[Confirmation]
:
Positive
side
to
TP1,
AM
:
Loop
antenna
:
With
preset
to
M6,
receive
144
kHz
signal
and
adjust
L6
to
obtain
1.1
+
0.02
V
at
TP5.
144
kHz
Preset
position
(M6)
288
kHz
Preset
position
(M7)
.
Adjust
TC3
to
maximize
output.
.
Repeatedly
adjust
L5
and
TC3
to
obtain
maximum
sensitivity.
AM
:
Loop
antenna
The
unit
should
not
usually
require
adjustment.
Follow
the
steps
below
when
adjustment
is
necessary.
:
603
Hz
Preset
position
(M3)
2.
Adjust
L3
to
maximize
output.
1404
kHz
Preset
position
(M4)
4.
Adjust
TC2
to
maximize
output.
5.
Repeatedly
adjust
L3
and
TC2
to
obtain
maximum
sensitivity.
FM
Negative
side
to
TP2
(750
unbalanced)
:
88
MHz
Preset
position
{M3)
2.
Adjust
L1
to
maximize
output.
:
Positive
side
to
TP8,
Negative
side
TP2
(75
2
unbalanced)
:
87.5
MHz
Preset
position
(M1)
:
With
preset
to
M1,
receive
87.5
MHz
signal
and
adjust
L1
to
obtain
1.3
+
0.02
V
at
TPS5.
:
88
MHz
Preset
position
(M3)
.
Adjust
L2
and
L13
to
maximize
output.
106
MHz
Preset
position
(M4)
.
Adjust
TC1
and
TC4
to
maximize
output.
to
obtain
maximum
sensitivity.
:
Positive
side
to
TP1,
Negative
side
to
TP2,
75
@
unbalanced
:
98
MHz
(preset
position
:
M4),
60
dBuV
modulation
FM
stereo
modulation
frequency:
1
kHz,
75
kHz
dev.
Confirm
that
stereo
operation
and
frequency
separation
meet
specifications.
UX-A5
A/B/E/G/GIVEN
Standard
Value
Fig.
6-6
T2
(AM
IF)
Fig.
6-7
T1
(FM
IF)
1.140.02V
Maximum
L5
Maximum
TC3
Maximum
L3
Maximum
TC2
Maximum
L1
1.3
0.02
V
Maximum
L2,
L13
Maximum
TC1,
TC4
(No.
1857)
19

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