Precision Power PCX1250 - Manual (Page 5)

Before beginning, disconnect the negative (-) terminal of the battery prior to
working on the positive (+) terminal to prevent a short to ground. This is important,
unless you want to spend the rest of your life with a nickname like
"Sparky," or
"Smokey." Reconnect the negative terminal only after all connections have been
made.
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Warning! A Main Fuse must be installed within 18" of battery!
To manage the additional heat associated with higher output capability, a thermally
controlled fan has been designed into the
PCX 1500 . When the heatsink tem-
perature reaches a pre-determined value, the fan is activated and cool air is
drawn in through the lower intake vents on the endplate. This cool air flows below
the circuit board, through the fan and across the internal fins, cooling the
heatsink. The warm air is then forced out through the upper endplate exhaust
vents.
The New! PCX™ amplifiers mass has been increased by 2 lbs. per linear foot
over last year’s P O W E RC L A S S ™ amplifiers, resulting in far superior heat
dissipation. The unique heatsink on your PCX™ amplifier has been designed with
fins on the inside of the aluminum extrusion. This allows for the transfer of heat
from the circuitry to the heatsink fins and out through the vents in the endplates.
Be sure you have ample space around the amplifier for cooling; at least 2" on all
sides.
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