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Marantz 2015 - AM Alignment Procedure; AM IF Alignment; AM Frequency Range and Tracking Alignment; FM Alignment Procedure

Marantz 2015
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8.
AM
Alignment
Procedure
8.1
AM
IF
Alignment
1.
Connect
a
sweep
generator
to
the
test
point
@
or
J107
and
an
alignment
scope
to
the
test
point
®.
2.
Rotate
each
core
of
IF
transformer
L116
and
L117
for
maximum
height
and
flat
top
symmetrical
response.
8.2
AM
Frequency
Range
and
Tracking
Alignment
1.
Set
AM
signal
generator
to
525
KHz.
Turn
the
tuning
capacitor
fully
closed
(place
the
tuning
pointer
at
the
low
end.)
and
adjust
the
oscillator
coil
L115
for
maximum
audio
output.
2.
Set
the
signal
generator
to
1650
KHz.
Place
the
tuning
pointer
in
the
high
frequency
end
and
adjust
the
oscillator
trimmer
on
the
oscillator
tuning
capacitor
(CA-2)
for
maximum
audio
output.
.
Repeat
the
step
1
and
2
until
no
further
adjustment
is
necessary.
.
Set the
generator
to
600
KHz
and
tune
the
receiver
to
the
same
frequency
and
adiust
a
slug
core
of
AM
ferrite
rod
antenna
for
maximum
output.
5.
Set
the
generator
to
1400
KHz
and
tune
the
receiver
to
the
same
frequency
and
adjust
the
trimming
capacitors
of
Antenna
(CA-1)
for
maximum
output.
6.
Repeat
the
step
4
and
5
until
no
further
adjustment
is
necessary.
Note:
During
tracking
alignment
reduce
the
signal
generator
output
as
necessary
to
avoid
AGC
action.
Ww
9.
FM
Alignment
Procedure
1.
Connect
a
FM
signal
generator
to
the
FM
antenna
terminals
and
a
oscilloscope
and
an
audio
distortion
analyzer
to
the
tape
output
jacks
on
the
rear
panel.
2.
Set
the
FM
SG
to
87.5
MHz
and
provide
about
3
to
5
nV.
Place
the
tuning
pointer
at
the low
frequency
end
by
rotating
the
tuning
knob
and
adjust
the
core
of
oscillator
coil
L103
to
obtain
maximum
audio
output.
3.
Set
the
FM
SG
to
108.5
MHz
and
provide
about
3
to
5
nV
output.
Rotate
the
tuning
knob
and
place
the
tuning
pointer
at
the
high
frequency
end
and
adjust
the
trimming
capacitor
C187
for
Maximum
output.
4,
Repeat
the
step
2
and
3
until
no
further
adjustment
is
necessary.
5.
Set
the
FM
SG
to
90
MHz
and
tune
the
receiver
to
the
same
frequency.
Decrease
signal
generator
Output
until
the
audio
output
level
decreases
with
the
decreasing
generator
output.
Adjust
the
antenna
coil
L101,
RF
coil
L102
and
IF
transformer
L105
for
minimum
audio
distortion.
6.
Set
the
FM
SG
to
106
MHz
and
tune
the
receiver
to
the
same
frequency.
Adjust
the
trimming
capacitor
CF-1,
CF-2
for
minimum
distortion.
7.
Repeat
the
step
5
and
6
until
no
further
adjustment
is
necessary.
8.
Connect
a
DC
VTVM
with
1
volt
range
selected
to
the
test
point
(E)(J120)
and
adjust
the
secondary
core
(upper)
of
discriminator
transformer
L107
so
that
no
voltage
reading
is
obtained
on
the
VTVM
at
no
signal.
Next
set
the
FM
SG
to
98
MHz
and
increase
the
output
level
to
1
KuV,
then
tune
the
receiver
to
the
same
frequency
so
that
no
deflection
is
obtained
on
the
VTVM.
Adjust
primary
core
(bottom)
of
L107
for
minimum
distortion,
and
adjust
the
L108
for
the
maximum
deflection
of
FM
signal
strength
meter
M001.
9.1
STEREO
Separation
Alignment
1.
Set
the
FM
SG
to
provide
1
Ku
V
at
98
MHz.
Tune
the
receiver
to
the
same
frequency
perfectly
(so
that
the
VTVM
connected
to
the
test
point
©)
gives
no
reading
).

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