NAD 7100 Series - AM Alignment; AM Tuning Voltage and IF Alignment; AM Scan Stop and Signal Meter Level

H.
AM
A.
B.
STEREO
SWITCHING
LEVEL
1.
Set
FM
Generator
output
to
5uV,
1kHz
100%
L
+
R.
2.
Adjust
R-148
so
that
the
stereo
light
just
turns
on.
Tolerance:
+
1
uV.
NOTE:
The
tuner
will
switch
into
mono
at
a
lower
level,
typically
4uVv.
SIGNAL
METER
LEVEL
1.
Set
FM
Generator
output
to
500
uV
2.
Adjust
R-141
so
that
fifth
LED
just
lights.
FM
NR
CIRCUIT,
MULTIPLEX
FILTERS
1.
Adjust
R-025
full
cw.
2.
Set
FM
Generator
output
to
1000uV,
1kHz
100%
L
+
R,
and
set
reference
for
S/N
measurement.
Cancel
the
stereo
modulation
and
leave
pilot
tone.
3.
Adjust
Z-111
(Z-112)(rear
slug)
for
minimum
subcarrier
output
on
left
(right)
channel;
Specification:
less
than
-60dB.
4.
Reduce
FM
Generator
output
so
that
S/N
ratio
reads
50dB.
(Approx
18uV)
5.
Adjust
R-025
so
that
S/N
is
improved
by
8dB.
ALIGNMENTS
TUNING VOLTAGE
1.
Connect
DMM
between
P-936
and
Ground.
2.
Tune
to
1600(1602)KHz.
Enter
into
Preset
2.
Adjust
C-137
for
reading
of
8.1V
+
0.5V.
3.
Tune
to
520(522)kHz.
Enter
into
Preset
1.
Adjust
L-102
for
reading
of
1.0V
+
0.1V.
4.
Repeat
until
within
tolerance.
ANTENNA, IF
1.
Swing
antenna
away
from
chassis.
2.
Connect
DC
voltmeter
to
Anode,
D110
(rear)
and
Ground.
3.
Tune
to
a
station
of
moderate
strength
near
1400kHz.
Enter
into
Preset
4.
Adjust
C-136
for
maximum
reading
on
meter.
4.
Adjust
I-103
and
I-104
for
maximum
reading
on
meter.
5.
Tune
to
a
station
of
moderate
strength
near
600kHz.
Enter
into
Preset
3.
Adjust
L-101(AM
Antenna)
for
maximum
reading
on
meter
(use
non-interactive
tool,
such
as
plastic
or
wooden
stick).
6.
Repeat
until
no
further
improvement.
SCAN
STOP/SIGNAL
METER
LEVEL
1.
Tune
to
1000kHz
and
feed
200uV
to
antenna
terminals.
2.
Adjust
R-165
so
that
fifth
LED
just
lights
fully.
11
TUNER
ADJUSTMENT POINTS
T103 @
(®) 136 (a)
I104
q
ll
B
L102
oe
RO25 (+] R177
(@)r6
| |D
Z111 2112
a
R141
eo
co34 @)
12