: Ensure a minimum distance around the unit to prevent overheating; never block the vent holes.
If you are looking for basic functionality, most Clarion head units from that era follow these standard procedures: Clarion Px-3994a-a Manual
: Press the button with the Power icon to turn the unit on. To turn it off, press and hold the [SRC] (Source) button for at least one second. : Ensure a minimum distance around the unit
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