Audiovox 990 - Manual (Page 18)

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