Adcom 2-CHANNEL GFA-5275 - Manual (Page 13)

TROUBLESHOOTING
It is beyond the scope of this manuai to be abie to cover all problems and
solutions. If this table does not help to solve the problem, contact your
dealer or the Adcom Technical Service Department for further advice.
Since the Balanced Line system eliminates induced engine noise and
ground-loop potentials between the GFl-5200 and the amplifier, engine noise
problems can usually be tracked down to the component(s) prior to the GFI unit.
You will need 4 RCA "shorting plugs" and an ohmmeter (or continuity tester)
SYMPTOM PROBABLE
CAUSB(S)
POSSIBLE
SOLUTION
Alternator
Whine
N
1
•❖ ■Ground loop.
■❖ ■Noise is
entering
through power
wires of head
unit.
■❖ Disconnect RCA inputs to the GFI-
5400 and plug the shorting plugs into
the GFI inputs. If the noise remains,
contact your Adcom Dealer or Adcom.
■❖ If the noise goes away, the problem is
not in the Balanced System and is
probably "upstream" of the GFI. Try a
"Noise Filter" on the power and/or the
memory lead of the upstream units.
Loud
1 squealing
noise
■❖ ■Loss of a
signal-ground
^Check to make sure all signal
connections are tIghL.
■❖ Disconnect eyerything and re-connect
it ONE component or cable at a time.
Turn the system on after each new
connection. When noise appears, the
item lust added is the culprit.
1 No Bass or
Weak Bass
■❖ ■One speaker
or Channel is
out<of-phase
-❖ Check speaker wire connections (both
ends). Make sure *■►’ to *■►", to
■❖ If you are using a GFI-4600; make sure
no polarity lumpers are out of phase.
Ampiifier
"Thermals"
Easily
■❖ ■Shorted
speaker wire.
■❖ ■Load is too
low.
■❖ ■Amp is
mounted,
incorrectly.
■❖ Check speaker wires for shorts
between leads, or shorts to ground. ,
-❖ Disconnect speakers and measure DC
resistance of speakers leads.
-❖ Make sure fan is not obstructed, or
amp Is not in too small of a space.
No Sound. No
LEDs lit in
amp.
■❖ ■Loss of power
to amp
•❖ Check PWR, GND and especially REM
connections.
. ■❖ Check all fuses.
No Sound. All
LEDs are lit in
amp.
■❖ ■Signal not
reaching amp.
<-Loose speaker
connections.
■❖ Check signal path from head unit to
amp.
■❖ Check speakers, speaker wire and
connections for integrity and continuity.
No Sound. 1
Red & 1
green
I LED lit in amp.
■❖ • Thermal
shutdown
■❖ Fault.
■❖ Let amp cool. It will reset.
■❖ Contact your Adcom Dealer or Adcom
Technical Service Dept.