Rockford Fosgate 250 - Manual (Page 26)

Speaker Output
Low or Distorted Readjust input gains of amplifier.
Check system with known working
source and repair or replace origi-
nal source as needed.
Check the alternator, battery, fuse,
and power and ground wiring.
Repair as necessary.
Input gain signal for amplifier
is incorrectly set.
Source unit output too low or
source unit has no output.
Low battery voltage or large
voltage drops to the amplifier
under load.
– 21 –
T
R O U B L E S H O O T I N G
Amplifier does not
turn on
(Power LED is off)
Symptom Diagnosis Remedy
Voltage applied to the REM
terminal of the amplifier is
not between 10.5 and
15.5 volts or there is no
voltage present.
Voltage to the B+ terminal
of the amplifier is not be-
tween 10.5 and 15.5 volts
or there is no voltage
present.
Amplifier is not properly
grounded.
Amplifier has no
sound
(Power LED is on)
Speaker leads are shorted
to each other or to the chas-
sis of the vehicle.
Speakers are defective.
Disconnect existing speakers and
test with known working speakers
and wires. If amplifier plays, check
and repair wiring and installation of
speakers as necessary.
Disconnect existing speakers and
test with known working speakers.
If amplifier plays, check and repair
speakers as necessary.
Check the alternator, battery, fuse,
and wiring and repair as necessary.
If the voltage is above 15.5 volts,
have the electrical system inspected
by an authorized car service center.
Check the alternator, battery, fuse,
and wiring and repair as necessary.
If the voltage is above 15.5 volts,
have the electrical system inspected
by an authorized car service center.
Check wiring and repair as neces-
sary.
TROUBLE- S
H
O
O
T
I
N
G
Amplifier Noise
(Turn-on Pop)
Voltage spike from output of
preceding component is en-
tering amplifier through in-
put signal. Disconnect input signal to ampli-
fier and turn amplifier on and off. If
noise is eliminated, connect REM
lead of amplifier to source unit with
a delay turn-on module.