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Marantz 2220 - FM Alignment Procedures; Stereo Separation Alignment; Muting Threshold Adjustment

Marantz 2220
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.
Repeat
step
1
and
2
until
no
further
adjustment
is
necessary.
.
Set
the
generator
to
600
KHz,
tune
the
receiver
to
the
same
frequenty-and
adjust
aslug
core
of
AM
ferrite
rod
antenna
for
maximum
output.:
.
Set
the
generator
to
1400
KHz
and
tune
the
receiver
to
the
same
frequency
and
adjust
the
trimming
capacitor
CA-1
for
maximum
output.
.
Repeat
procedures
4
and
5
until
no
further
adjustment
is
necessary.
Note:
During
tracking
alignment
reduce
the
signal
generator
output
as
necessary
to
avoid
AGC
action.
9.
FM
Alignment
Procedure
1.
2
Connect
a
FM
signal
generator
to
the
FM
antenna
terminals
and
an
oscilloscope
and
an
audio
distortion
analyzer
to
the
tape
output
jack
on
the
rear
panel.
Set
the
FM
SG
to
87.5
MHz
and
provide
about
3
to
5yV.
Place
the
tuning
pointer
at
the
low
frequency
end
by
rotating the
tuning
knob
and
adjust
the
core
of
oscillator
coil
L108
to
obtain
maximum
audio
output.
.
Set
the
FM
SG
to
108.5
MHz
and
provide
about
3
to
5uV.
Rotate
the
tuning
knob
and
dbs
the
tuning
pointer
at
the
high
frequency
end and
adjust
the
trimming
capacitor
C152
for
maximum
output.
.
Repeat
steps
2
and
3
until
no
further
adjustment
is
necessary.
.
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
RF
coil
L107
and
antenna
coil
L106
and
IF
transformer
L109
for
minimum
audio
distortion.
.
Set
the
FM
SG
to
106
MHz
and
tune
the
receiver
to
the
same
frequency.
Decrease
the
signal
generator
output
until
the
audio
output
level
decreases
with
the
decreasing
generator
output.
Adjust
the
trimming
capacitor
CF-1
and
CF-2
for
minimum
distortion.
.
Repeat
steps
5
and6
until
no
further
adjustment
is
necessary.
.
Connect
a
DC
VTVM
with
1
V
range
selected
to
the
resistor
R237
(inside)
and
adjust
the
secondary
core
(black)
of
discriminator
transformer
L201
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
1
KuV,
then
tune
the
receiver
to
the
same
frequency
so
that
no
deflection
is
obtained
on
the
VTVM.
Adjust
primary
core
(pink)
of
L201
for
minimum
distortion.
ane.
10.
Stereo
Separation
Alignment
=
=
1.
2.
Set the
FM
SG
to
provide
1KuV
at
98
MHz.
Tune
the
receiver
to
the
same
faddenty
so
that
the
VTVM
connected
to
the
Resistor
R237
(inside)
will
give
no
readings.
Modulate
the
FM
SG
with
67
KHz
audio
frequency.
Connect
an
oscilloscope
to
the
R315.
-
Adjust
the
core
of
L303
for
minimum
height
of
the
67
KHz
signal
on
the
scope.
4,
.
Modulate
the
FM
SG
output
with
stereo
composite
signal
consisting
of
subchannel
signal
only
(of
course,
a
pilot
signal
must
be
included).
Adjust
the
core
of
L304
for
maximum
audio
output,
then
modulate
the
signal
generator
output
with
a
stereo
composite
signal
consisting
of
L
channel
signal
only
and
again
adjust
the
core
of
L304
for
maximum
audio
output.
Adjust
the
trimming
resistor
R329
for
maximum
and
same
separation
in
both
channels.
11.
Muting
Threshold
Adjustment
1.
Set the
FM
SG
output
to
provide
12.5uV
(IHF)
at
98
MHz
and
tune
receiver
to
the
same
frequency.
Adjust
the
trimming
resistor
R245
for
the
threshold
level
of
12.5uV.
(During
this
adjustment
turn
the
MUTING
pushswitch
‘’on’’.)

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