Inovonics 235, Operating And Maintenance Instruction Manual

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Voltage Selector
A mains voltage selector switch is located beneath the top cover of the
unit, close to the AC mains connector on the main circuit board. With
primary AC power disconnected, slide the red actuator with a small
screwdriver so that the proper mains voltage designation (115 or 230)
shows. Be certain always to install an appropriate fuse, and check that
the rear-panel voltage/fuse designation is properly marked. It is
factory practice to cross-out the inappropriate designation with an
indelible black marking pen. You can remove this strikethrough with
lacquer thinner to redesignate.
BE SURE that the mains voltage selector setting and
primary fuse value are appropriate for the mains supply
before plugging the 235 Processor into the wall outlet.
Power Cord
The detachable IEC-type power cord supplied with the Processor is
fitted with a North-American-standard male plug. Nevertheless, the
individual cord conductors are supposed to be color-coded in
accordance with CEE standards; that is:
BROWN = AC “HOT” BLUE = AC NEUTRAL GRN/YEL = GROUND
If this turns out not to be the case, we offer our apologies (cords come
from many sources) and advise that US color coding applies:
BLACK = AC “HOT” WHITE = AC NEUTRAL GREEN = GROUND
RADIO FREQUENCY INTERFERENCE ( R F I )
Location
Although we have anticipated that the 235 will frequently be installed
adjacent to high-power AM transmitters, please practice care and
common sense in locating the unit away from abnormally high RF
fields.
Ground Loops
Because the input and the output of the Model 235 are chassis-ground-
referenced, a mains frequency or RF ground loop could be formed
between the input or output cable shield grounds and the AC power
cord ground. A “ground-lifting” AC adapter will probably remedy such
a situation, though the chassis somehow must be returned to earth
ground for safety. Generally, being screwed-down in the equipment
rack will satisfy the safety requirement.
LINE INPUT AND INPUT RANGE SELECTION
Input
Connection
The Model 235 has an electronically-balanced (transformerless)
program LINE INPUT . This is brought out to a screw-terminal barrier
strip on the rear panel, and includes a chassis ground connection for
the input cable shield. Please note that the screw-terminal barrier block
can be unplugged from the chassis, simply by pulling it straight out!
This makes connection a bit easier and allows quick removal of the 235