NAD 7020 - Alignment and Layout; Alignment Procedures

3.
FM
MPX
ALIGNMENT
1
.
Same as
FM
ALIGNMENT
1
2.
3.
2.
FM SG
is
external
moduloted
by
STEREO
SG
and connected to
FM 3OOz
antenna terminal
on the
rear
panel
through
FM dumy
antenna.
Dial
Section
Step
FM
SG
Stereo SG
Indicator
Adjustment
Adjust
for
Setting
Connect
Pointof
frequency
19KHz±
1
—
V
no signal
counter
VR2O1
30Hz
MPX
received
through
pilot
100K2toTP10
10%
19KHz
Pilot
Stereo
2
98MHz
98MHz
—
VR2O1
90%
L+R,
L-R
•
LED
light
Connect
10%l9KHzpilot
VTVMor
Minimum
1
98MHz
VR202
L
only
Oscilloscope
output
to
A
REC
OUT
Connect
Separa-
10%
19KHz pilot
VTVM
or
Minimum
tion
2
98MHz
98MHz
VR202
R only
Oscilloscope
output
to
L
REC OUT
3
Repeat
Step
1
and
Step
2
If
there
is
an
excessive
difference
between
leakfree
effect
of
both
channels
4
slightly
adjust
VR202
so that
the
level
of signal
leakage
of
both
channels
are
equal.
IDLE
CURRENT
ALIGNMENT
1
.
5
minutes
minimum
pre-heating
is
necessary.
2.
Set
the
volume
control
at
minimum
position.
3.
Connect
DC
milli-voitmeter
across
R660
for right
channel
and
across
R659
for
left channel.
The
meter
sensitivity
should be set
for
30—lOOmV
full
scale
deflection.
4.
Insert
1
K
ohm carbon
resistor
in
parallel with R648
(right
channel) and
R647
(left
channel).
5.
After
insert
1
K
ohm.
if
the
reading
of
meter
were
between300mV
and
6OmV,then
the
alignment
is
completed.
6.
If
the
reading
were
less
than
3OmV
then the
value
of
RX1 or
RX2
should
be
reduced
till
the
reading
is
between
3OmV and
6OmV.
7. If
the
reading
were
more
than
6OmV
then
the
value
of
RX1
or
RX2 should
be
increase
till
the reading
is
between
3OmV and 6OmV.
DC
OFF-SET
ALIGNMENT
1.
5
minutes
minimum
pre-heating
is
necessary
2.
Set
the
volume control
at
minimum
position.
3.
Speaker
switch
should be
set
to
“A”
position.
4.
Connect DC
milli-voltmeter
to
the
“speaker
A”
terminal
of each
channel.
The
meter
sensitivity
should
be
set
for
100-300mV
full
scaledeflection.
The
positive
inputof
the
metershould
be
connected
to the
red
(+)
speaker
terminal.
5.
If
the
readings
were
within
±5OmV,
then the alignment
is completed.
6.
If the
reading
is
over the rang
of
±5OmV
then
adjust
VR6O1
(for
left
channel)
and
VR602
(for
right channel)
tiH
the
meter
reading
is
zero.
ALIGNMENT
(TUNER)
1
.
AM
ALIGNMENT:
1
.
Selector
switch
in
AM position
2. AC
line
voltage
at
rated voltage
3.
Monitor
output
at
REC OUT
AM SG
Dial
Section
Indicator
Adjustment
Adjust
Setting
Point
for
Connection
Carrier
Freq. Modulation
Hot side
of
SG
Point
of
T302
AM IF
Outputthrough
455KHz
30%Mod
non-
and
400Hz
200
PF
to
AM
interference
T303
—
antenna
trimmer
VTVM
-
Maximum
terminal
(TP1)
30%Mod.
or
T301 and
1
600KHz
600KHz
output
Hot side
of
SG
400Hz
Oscilloscope
Antenna
Bar
AM
—
output
through
200
PF
to
EXT
AM
30%
Mod.
TC-2
and
RF
2
antenna
terminal
1400KHz
400Hz
1400KHz
TC-4
—
on rear panel
-
3
Repeat
Step
1
and Step
2
2.
FM
ALIGNMENT:
1.
Selector
Switch
in
FM
position
2.
AC
line
voltage at
rated
voltage
3. Monitor
output at
REC OUT
FM
SG
Dial
Section
—
—
Indicator
Adjustment
Adjust
Setting
for
Connetion
Carrier
Freq.
Modulation
Point of
Tuning
TiOl
FM
IF
—
—
—
non-
Meter
of
(Discri,
IFI
Center
Indication
interference
Set
primary
A)
1
90MHz
90MHz
VTVM
L-1
100%Mod.
Maximum
FM
-
—
or
400Hz
2
106MHz
106MHz
Oscilloscope
TC-1 TC-3
Output
RF
-
3
Repeat Step
1
and
Step
2
FM
100%Mod.
J
Lstortion
TiOl
Mono
98MHz
400Hz
[
98MHz
Meter
upper
side
Minimum
Connect
to
D
istor-
-
Distortion
FM300ohm
tion
2
Repeat
FM
IF
and
FM
MONO
DISTORTION
Step
1
antenna
terminal
—
on the
rear
panel
Selector
Switch
in
FM Muting
Position
1
through FM
dumy
Adjust
attunuator
of
FM
SG
for antenna
input
1 5dB
antenna.
VTVM
FM
2
98MHz
100%Mod
98MHz
or
VR1O1
Output
just
400Hz
Mute
Oscilloscope
disappear
3
Increase
FM
SG
output
4dB more
to
get
full audio
output
4
If full
audio
output
cannot
be
got
repeat
Step
1 .
2.
3.
ALIGNMENT
(AUDIO)
(I
0
.
‘‘V
/1