Audiovox 990 manual Troubleshooting, Problem, Probable Cause, Check Following

TROUBLESHOOTING

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TROUBLESHOOTING

PROBLEM	PROBABLE CAUSE	CHECK FOLLOWING
		Orange/White stripe wire to +12V
Unit completely inoperative no	Incorrect power connection	ACC. and Green/White stripe wire
lights, no sound		to +12V battery
	Blown fuse	Check fuses in wires listed above
		and check car fuse block
Unit will not keep time or Radio	Incorrect power connection	Green/White Stripe wire is not con-
station memory		nected to a "live" +12V battery
(Electronic Tuning Radios Only)		source
	Blown fuse	Check fuse in Green/White stripe
		wire and at car's fuse block
Noise on both radio and tape	Poor ground	Check Black/White stripe wire for
		proper grounding
	Dirty or corroded battery posts	Clean and tighten connection
	If problem also existed with previ-	Consult your local garage me-
	ous radio you removed	chanic-car may need tune-up or
		noise filter
Noise on radio only	Antenna	Check that antenna base is
		grounded. Test with antenna dis-
		connected. If noise goes away,
		replace antenna
Poor FM reception and almost no	Antenna	Replace antenna and antenna
AM reception		cable
Poor FM reception and Good AM	FM Local-Distant switch	Check if unit has a Local-Distant
reception		switch and set to "Distant" position
No sound on one speaker	Wiring	Check speaker wiring
(both radio and tape)
	Speaker	Test with good speaker
	Radio Operation	Check balance and fader controls
Poor sound on tape only (after	Dirty tape mechanism	Clean tape head and mechanism
one month or more of tape usage)
Poor sound-new unit	For radios with 40 watts or more	Check rating of speakers for suffi-
	output power	cient power capacity
		Check that speakers are in good
		condition
		Check that Violet and Green
		speaker wires are not grounded
	Wiring	Check speaker wiring