Line Voltage Switch; External Connections - Universal Audio 1178 Operating Instructions Manual

To comply
with most Electrical
Codes, the 1178
is
supplied
with
a
three-wire
lEC
style connector, the grounding pin
of
which
is
connected to the chassis*
In some installations this may create
ground— loop problems*
Ground loops can result in
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, one may check for the
possibility
of ground loops
by using a 3—
prong to 2—
prong AC adapter between
the power cord and the mains supply, ungrounding the AC plug
temporarily*
This ungrounds the Model 1178, and
may cure the hum
or buzz,
but
is
not
a
substitute
for
proper system grounding* Be
aware that unless the Model 1178 Dual Peak Limiter
is
AC grounded,
a
safety hazard can exist*
UREI accepts no responsibility for legal
actions or for
direct, incidental or consequential 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 1178 was shipped ready for operation
with nominal 115
VAC
power mains*
In order to change this for nominal 230 V
(50
Hz 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,
as
indicated on the rear panel barrier strip*
If
the
XLR/QG connectors
are to be used, install the accessory Model 301 according to the
instructions suppplied with the adapter*
(See also
"Mounting
Instructions," Page
9,
and
Section VI*)
If the
Model 1178 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*
(See
Section
2*6 regarding input termination)*
(See
Figures 2-1 and 2-2
on the following page
for
recommended connection procedures*)
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