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NAD 7225PE - Page 4

NAD 7225PE
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AM
ALIGNMENT
IMPORTANT
NOTES
1.
1KHzZ
30%
modulation.
|
2.
22
pF
connected
between
signal
generator
and
AM
antenna
terminal.
Capacitor
should
be
as
close
as
possible
to
antenna
terminal.
3.
Enter
the
following
frequencies:
600
(603)KHz,
1000
(999)KHz
and
1400
(1404)KHz.
.
PROCEDURE
A.
OSCILLATOR
TUNING
VOLTAGE
1.
Connect
DVM
between
P123
and
ground.
2.
Set
tuner
to
600
(603)KHz
and
adjust
L102
for
1.75V+S50mV
reading
on
DVM.
.
IF
ADJUSTMENT
1.
Apply
1000
(999)KHz
20dBu
to
antenna
terminals.
2.
Adjust
1101
for
maximum
reading
on
audio
output.
.
TRACKING
ADJUSTMENT
.
Apply
600
(603)KHz
20dBu
to
antenna
terminals.
Adjust
L101
for
maximum
reading
on
audio
output.
Appiy
1400
(1404)KHz
20dBu
to
antenna
terminals.
Adjust
C138
for
maximum
reading
on
audio
output.
Repeat
(1)
to
(4)
until
no
further
improvement
can
be
made.
POR
s
AUTOSEARCH
/
TUNER
LEVEL
1.
Apply
1000
(999)KHz
20
dBu.
|
2.
Adjust
R116
so
that
tune
LED
just
lights
fully.
at
iy

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