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Symptom
Speaker Output
Low or Distorted
No Output on
Rear Channels
Only
(using 2 inputs)
Rear Channels
are Non-Fading
(using 4 inputs)
Amplifier Noise
(Turn-on Pop)
Diagnosis
Input gain signal for
amplifier is incorrectly
set.
Source unit output too
low or source unit has
no output.
XCard is missing or not
placed properly in cross-
over slots.
Low battery voltage or
large voltage drops to
the amplifier under load.
Signal input switch not
configured properly.
XCard is missing or not
placed properly in
crossover slot.
Signal input switch not
configured properly.
Voltage spike from out-
put of preceding com-
ponent is entering am-
plifier through input sig-
nal.
Voltage spike from re-
mote turn-on lead is
entering through REM
input terminal.
– 35 –
Remedy
Readjust input gains of
amplifier.
Check system with known
working source and repair
or replace original source
as needed.
Check XCard position and
repair or replace as neces-
sary.
Check the alternator, bat-
tery, fuse, and power and
ground wiring. Repair as
necessary.
Check signal input switch
and reconfigure for 2-chan-
nel input.
Check XCard position and
repair or replace as neces-
sary.
Check signal input switch
and reconfigure for 4-chan-
nel input.
Disconnect input signal to
amplifier and turn ampli-
fier on and off. If noise is
eliminated, connect REM
lead of amplifier to source
unit with a delay turn-on
module.
Use a different 12 volt
source for REM lead of am-
plifier. (i.e., battery direct)
If noise is eliminated, use a
relay to isolate amplifier
from noisy turn-on output.
TROUBLE-S
H
O
O
T
I
N
G
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