NAD 7130 Service Manual

ALIGNMENT
METHOD
AUDIO
SECTION
7130
IMPORTANT
Speaker
Impedance
switch
should
be in
8
ohm
position
while
adjusting
center
voltage
and idling
current.
INITIAL
ADJUSTMENT
(No
load
connected)
A.
CENTER
VOLTAGE
1.
Connect
DC
millivoltmeter
to
L
channel
output
terminals.
2.
Turn
on
and
adjust
to 0 V
±
30mV
with VR401 (1KB).
Connect
DC
millivoltmeter
to
R
channel output
terminals
and
adjust
VR402
to
0 V
±
30m
V.
B.
IDLING
CURRENT
1.
Remove
solder short
across
R461
and
R462.
2.
Connect
DC
millivoltmeter
across R461
(112)
(output
transistor's
collector
resistor) and
adjust RX1
for
26'30mV
reading
on meter.
Repeat
adjustment
with
RX2,
connecting
meter
across
R462 (1^2).
3.
Leave
power
on for
minimum
5
minutes.
FINAL
ADJUSTMENT
C.
CENTER
VOLTAGE
1 .
R
epeat
step
A
above.
D.
IDLING
CURRENT
1.
Repeat
step B
and adjust
with RX1,
RX2
for
30m
V
reading
on
meter.
2.
After
the
alignment is
finished,
lO
resistor
R461, 462 is
shorted by solder
short.
AMPLIFIER
ADJUSTMENT POINTS

NAD 7130 Specifications

General

Brand	NAD
Model	7130
Category	Stereo Receiver
Language	English