Rockford Fosgate 250 sERIES Installation & Operation Manual page 47

Symptom
Speaker Output Low
or Distorted
Amplifier Noise
(Turn-on Pop)
No output from Pass-Thru
output of amplifier.
Diagnosis
Input gain(s) for amplifier incorrectly
set.
Source unit output too low or source
unit has no output.
Phase selection of amplifier incorrectly
selected or speakers wired out of polar-
ity from the left to right channel.
XCards are missing or not placed prop-
erly in crossover slots and/or switches
are not properly selected.
Low battery voltage or large voltage
drops to the amplifier under load.
Voltage spike from output of preceding
component is entering amplifier
through input signal.
Voltage spike from remote turn-on lead
is entering through REM input termi-
nal.
RCA Input from source unit is not con-
nected or not functioning properly.
When using the BLT, Balanced Line
Input from BLT is not connected or not
functioning properly.
Unbalanced/Balanced Line switch is
not selected for corresponding input.
XCards are missing or not placed prop-
erly in crossover slots.
– 43 –
Remedy
Readjust input gains of amplifier.
Check system with known working
source and repair or replace original
source as needed.
Check speaker polarity and phase switch
position and correct as needed.
Check crossover switches and XCard
positions and repair or replace as nec-
essary.
Check the alternator, battery, fuse or
circuit breaker and power and ground
wiring and repair as necessary.
Disconnect input signal to amplifier
and turn amplifier on and off. If noise is
eliminated, connect REM lead of am-
plifier to source unit with a delay turn-
on module.
Use different 12 volt source for REM
lead of amplifier (i.e., battery direct). If
noise is eliminated, use relay to isolate
amplifier from noise turn-on output.
Check connections, substitute with
known working source and cables and
repair or replace as necessary.
Check connections, substitute with
known working BLT and cables and
repair or replace as necessary.
Check switch position and correct as
necessary.
Check crossover switches and XCard
positions and repair or replace as nec-
essary.
TROUBLE-S
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