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AC mains power
is
supplied
to the Model 562
through
an IEC-
style 3-conductor receptacle mounted on the rear of the chassis,
and
a
matching 3-wire power cable.
The ground pin
of the
connector
is
tied to the
chassis
of the
Model 562
in
order
to
comply with
electrical codes.
In
some installations this may create ground-loop
problems.
Ground loops can become very evident
(as
hum and
buzz)
if a
significant potential difference exists between
the
AC conduit
ground and the grounded metal enclosure
in
which
the chassis
is
installed.
If
hum
is
experienced, check
for the
possibility
of
ground loops by using
a
3-prong
to
2-prong AC adapter, ungrounding
the AC plug
temporarily.
This ungrounds
the
Model
562,
and m^y
cure the hum or buzz, but
is
not
a
substitute for proper system
grounding.
Be aware that
unless
the
Model
562
Feedback Suppressor
is
AC grounded#
a
safety hazard
can exist
.
UREI accepts no respon-
sibility
for legal
actions or
for direct,
incidental or consequen-
tial
damages that may result from violation
of any
electrical
codes.
2.4
LINE VOLTAGE SWITCH
Unless
a
tag on the line cord
specifies otherwise, the
Model 562 was shipped ready for operation with nominal 115 VAC
power mains.
In
order
to
change this for nominal 230
V
(50
or
60
Hz), slide the
VOLTAGE SELECTOR switch on
the rear panel to
the 230
position.
The voltage
is
visible
in a
window next
to the
switch slot.
Be sure to
change the fuse
to the
correct value:
1/8-amp slo-blo when changing
to 230
V operation
or
1/4-amp
slo-blo for
115
V operation.
A small screwdriver should
be
used
to
move
the
recessed switch.
2.5
EXTERNAL CONNECTIONS
Permanent input
and
output signal wires should
be
shielded
cable, and connected in accordance with standard wiring practice.
Connections may
be
made
to
either
the
barrier strip or
the
XLR/QG
connectors on the rear panel
•
NOTE:
The pins of the XLR*s are wired as follows:
#3 to "±" of
input and output,
#2 to
"Common"
of
input and output,
#1 to
Ground (chassis).
To accommodate other wiring practices, the connection
to
the
barrier strips may be changed inside
the
Model
562.
If
the Model 562
output
is
connected
to
a
high impedance
circuit, we recommend shunting the
"±"
and "COM" output terminals
with
a
620 ohm, 1/2
watt resistor.
This assures
optimum
loading
for the
562.
(See
Section
2.6
regarding input termination).
(See
Figures
2-1 and 2-2
on the following page)
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6
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