NAD C 320 - Alignment Procedure

ALIGNMENT PROCEDURE
1. INITIAL ADJUSTMENT (No load connected)
A.OUTPUT OFFSET VOLTAGE
1.Connect a DC Millivoltmeter to L Channel speaker output terminals.
2.Turn unit “ON” and adjust VR21 (1 kohms) to get a reading of OV +30 mV.
3.Connect
the
DC
Millivoltmeter
to
R
Channel
speaker
output
terminals
and
adjust
VR
11 (1
kohms)
to
get
a reading
of
0
V +
30
mV.
B.IDLING CURRENT
1.Connect a DC Millivoltmeter to TP1 and TP2 and adjust VR22 (300 ohms) for
7-9 mV reading on meter.
2.Connect the DC Millivoltmeter to TP3and TP4 and adjust VR12 (300 ohms) for
7-9 mV reading on meter.
3.Leave power “ON” for a minimum of 5 minutes.
ll. FINAL ADJUSTMENT
Repeat
procedure
A
and
B
for
offset
voltage
and
idling
current
alignment
respectively.
PCB LAYOUT(SMALL BOARD)
= ATTENTION:
UTLUSER UN FUSIBLE DE
RECHANGE DE MEME TYPE.
CAUTION: FoR CONTINUED
PROTECTION AGAINST RISK
OF FIRE REPLACE ONLY
WITH SAME. TYPE FUSES.