Legacy Car Audio LA-789 - Manual (Page 14)

troubleshooting
p'rotectlon
clrcultru
The built-in protection circuitry in the American
Legacy
Series
amplifiers will disable the amplifier
if it senses an input overload, a speaker short circuit,
or extreme temperature conditions.
When the circuit is activated by any of
these the Protection LED will be
illuminated.
If this occurs, carefully inspect the system to
determine the source of the problem.
•
If the shutdown was a result of a thermal overload
condition, allow the amplifier to cool down before
attempting to restart it.
•
If the shutdown was a result of an input overload,
or speaker short circuit, be sure to correct the
condition before restarting.
The can be restarted by turning the remote
power and then ON again.
liD
autput.
Confirm that all terminal strip connections are secure and tight.
Check both in-line and built-in fuses. Both the + 12Vand the Remote terminals must have +12V referenced to chassis
ground.
Confirm that the audio signal sourca (car radiO, equalizer, is connected and is supplying output To
check if the amp is supplyinQ un
r
lug the cables from signal source leave them into the
amp). Bnetly tap the center Pin each 0 the disconnected RCA plugs with your This should produca a noise
(teedback) in your speakers.
Dne clulnnel works.
that all terminal strip connections are secure and tight.
Check the Balance control on the head unit (or other source) to verify that it is set to its midpoint.
If you are the Low Level RCA input, reverse the plugs at the amplifier (i.e., switch the L with the R). If
the channels is silent switches to the other side, problem is either in the head uniVother source or the
connecting cables.
Welk autp.t.
Readjust the Input Level Control(s) to better suit the input signal .
IIDIse
In tile
audlD.
If the noise is a ''whine· whose pitch follows the engine speed, confirm that the amplifier and any other signal
sourcas (head unit, etc.) are properly grounded.
If the noise is a "clicking" or ·popping" noise whose rate follows the engine speed, this usually means that the
vehicle is equipped with resistor spark plugs and wires, or that the ignition is in need of service.
Check the rounting of the speaker and input wires to make sure they are not adjacent to wires which interconnect
lights and other accassories.
If the above steps fail to improve or clear noise interterence, the system should be checked by a professional mobile
audio installer.
precautions
Do not operate the amplifier when it is unmounted.
Attach all audio system components within
the automobile to prevent damage, in an
accident.
Do not mount this amplifier so that the wire
connections are unprotected, or in a pinched
condition, or likely to be darnaged by nearby objects.
Before or breaking power connections in
your system, the vehicle battery. Confirm
that your head unit or other equipment is turned off
while connecting the input jacks and speaker
terminals.
If
lOU need to replace the power fuse, do so
With a fuse identical to that supplied with the
Using a fuse of a different or rating may result
in damage that isn1 the manufacturer�
warranty.
4
...
ho""oIA
.. ,nn.r
(O,. ... nl'nSIo ... ) :t-
YES!
Four 4-Ghm ..,e.u" wired In 1It,,-.o,
wli p ... .m • 4-ohm lo.d 10
chanl'llli 01 1M ampllft.r. Mod four­
ChMlMI1 .mpllft.rs wi ll work well In thl'
aanfiguretion.
notes
Two 4-ohm IPMIt. .. , wired In PIIr,II,1
lD I bridg.d Iwo-ehlnn.! amplifi.r.
will preHn! • 2-ohm mono loed to th.
amplifi,r. lIOn'TWO-CHANIII!L
AMPUFIIItI DO NOT 1U1'� I-otIM
IIIONO OPERATIONI AIlII'UFER DNMGE
COULD
RElIL T1
.... """ ....... " ... ,
(O,., ... ".
IrIoIl.� 11.,0)
NOI
Four +ohm .pM"''', wired In p . .. n.,
10. brldg..:l fuur-d1.nn.l.mpllft.r,
will p ..... t • 4..,hm mono lOG til thl
..,pllll.,. MOlT FOUIt-CIlANIilEL
AMP'LFEItI DO NOT"� J.OHM
IIDNO OP'EltAlIONI Mft.l'lEIlIIAMAGIE
COULDalULTI