NAD 7250PE - Page 15

AMPLIFIER
ALIGNMENTS
A
IDLE
(QUIESCENT)
CURRENT
1
Connect
mV
meter
(DVM)
from
TP601
to
TP602,
left
chan.
(from
TP
651
to
TP
652,
right
chan.)
2
Adjust
R
624,
left
chan.
(R
674,
right
chan.)
so
that
meter
reading
is
20
-
25
mVDC.
NOTE:
Reading
may
take
a
few
minutes
to
stabilize;
re-check
after
offset
adjustment
(next
step.)
B
OFFSET
(CENTERING)
VOLTAGE:
Adjust
R
645.
left
(R
695,
right)
so
that
voltage
at
spkr.
terminals
is
0
+
50
mVDC.
NOTE:
Perform
these
adjustments
with
no
load,
volume
minimum.
Cc MINIMUM DISTORTION
1
Connect
distortion
meter
to
the
output
terminal
for
speaker.
2
Feed
20
KHz
from
audio
generator
into
‘‘MAIN
IN”
and
adjust
its
input
level
so
that
the
output
at
the
speaker
terminal
is
3
V
(RMS)
with
no
load.
3
Adjust
R618
(left
channel)
and
R
668
(right
channel)
so
that
the
distortion
measured
at
the
speaker
output
terminal
will become
minimum.
14