NAD MONITOR Series - Alignment Procedures; Main Amplifier Calibration Steps; Preamplifier Channel Balance

REMOTE CONTROL TRANSMITTER
STATION SELECTION
CD TRACKS
TAPE LOCATIONS
MODE
SIGNAL
SOURCE
SELECTION
SELECTION
VOLUME
PLAYBACK
CONTROLS
SCHEMATIC
FOR
REFERENCE
ONLY,
TRANSMITTER
NON-REPAIRABLE.
MAIN
AMPLIFIER
ALIGNMENT
IMPORTANT NOTES
1.
Before
adjusting,
remove
input
signal
and
load,
and
set
speaker
impedance
switch
to
8
(HIGH);
reset
to
40
(NORMAL)
when
finished.
:
2.
These
adjustments
are
always
necessary
after
repair
to
main
amplifier.
;
3.
After
repair,
it
is
recommended
to
use
current
limiter
(200-250W
lightbulb)
in
mains
line,
for
initial
turn-on.
A. CENTER VOLTAGE CHECK
1.
Connect
DVM
from
Ground
to
R836,
L
chan
(R886,
R
chan).
2.
Turn
power
on,
and
check
for
reading
of
OV
+100mVDC.
B. IDLE CURRENT ADJUSTMENT
1.
Connect
DVM
from
TP801
to
TP802,
L
chan
(TP851,
TP852
R
chan).
2.
Adjust
R818,
L
chan
(R868,
R
chan)
for
reading
of
14mV
+1mVDC.
Cc. FINAL ADJUSTMENT
1.
Leave
power
on
minimum
5
minutes.
2.
Repeat
center
voltage
check
and
idle
current
adjustment.
PREAMPLIFIER
ALIGNMENT
CHANNEL BALANCE
1.
Feed
1kHz,
100mV
to
CD
input;
connect
AC
VTVM's
to
Pre
Out.
2.
Set
volume
to
maximum,
balance
to
center,
low
level
off.
3.
Adjust
R758
so
that
both
channels
have
same
output
level
+0.25cB.
TP802
TP801
TP852
TP851
| 2)
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R836
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i
on
R886
a
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R818
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R868
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