Pioneer GM-4200 Service-Handbuch - Seite 8
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BFC (Best Frequency Control} switch
tf beating is heard when listening to AM stations on your car radio,
change the position of the BFC switch on the bottom of the amplifier
with a small flat-bladed screwdriver.
Compulsory fan cooling system
This is a high-power amplifier, so it produces a lot of heat. To keep it
cool, it has fan cooling.
• When the power of the car stereo is turned on, the compulsory
cooling fan of this power amplifier works automatically and cools
inside of this amplifier.
• Install the amplifier so there is enough space front and back to
allow the fan cooling to work properly. If the front or back side is
covered, the amplifier may malfunction or fail.
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Compulsory fan
cooling air outlet
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