Rockford Fosgate 400x4 Speaker Output, Low or Distorted, No Output on, Rear Channels, Only

Symptom	Diagnosis			Remedy
Speaker Output	Input gain signal		for	Readjust input gains of
Low or Distorted	amplifier is incorrectly			amplifier.
	set.
	Source unit output too			Check system with known
	low or source unit has			working source and repair
	no output.			or replace original source
				as needed.
	XCard is missing or not			Check XCard position and
	placed properly in cross-			repair or replace as neces-
	over slots.			sary.
	Low battery voltage or			Check the alternator, bat-
	large voltage drops		to	tery, fuse, and power and
	the amplifier under load.			ground wiring. Repair as
				necessary.
No Output on	Signal input switch not			Check signal input switch
Rear Channels	configured properly.			and reconfigure for 2-chan-
				nel input.
Only
(using 2 inputs)	XCard is missing or not			Check XCard position and
	placed	properly	in	repair or replace as neces-
	crossover slot.			sary.
Rear Channels	Signal input switch not			Check signal input switch
are Non-Fading	configured properly.			and reconfigure for 4-chan-
				nel input.
(using 4 inputs)
Amplifier Noise	Voltage spike from out-			Disconnect input signal to
(Turn-on Pop)	put of preceding com-			amplifier and turn ampli-
	ponent is entering am-			fier on and off. If noise is
	plifier through input sig-			eliminated, connect REM
	nal.			lead of amplifier to source
				unit with a delay turn-on
				module.
	Voltage spike from re-			Use a different 12 volt
	mote turn-on lead is			source for REM lead of am-
	entering	through REM		plifier. (i.e., battery direct)
	input terminal.			If noise is eliminated, use a
				relay to isolate amplifier
				from noisy turn-on output.

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