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HAPTER 8 – TROUBLESHOOTING AND SERVICE GUIDE
S4800 loudspeakers are designed
to provide years of trouble-free
service.
If you are experiencing difficul-
ties, we suggest you check these
p
ossibilities before contacting
your JBL specialist dealer for
a
ssistance.
IF THERE IS NO SOUND
FROM ANY OF THE
SPEAKERS:
• Check that the receiver/amplifier
is on and a source is playing.
• Check all wires and connections
between the receiver/amplifier
and the speakers. Make sure all
wires are connected, and are
not frayed, cut or punctured. No
wires or strands should be touching
each other or the shorting straps
connected to other terminals.
• Review proper operation of your
receiver/amplifier.
IF THERE IS NO SOUND
COMING FROM ONE
SPEAKER:
• Check the “Balance” control on
your receiver/processor.
• Check all wires and connections
between the receiver/amplifier
and the speakers. Make sure all
wires are connected, and are not
frayed, cut or punctured. No
wires
or strands should be touching
each
other or the shorting straps con
-
nected to other terminals.
• In digital surround sound modes,
make sure that the receiver/
processor is configured so that
the speaker in question is
enabled.
• Switch the speaker wires
between the speaker with the
problem and one that is working
c
orrectly. If the problem remains
in the same speaker, then the
fault is in the loudspeaker. In
this event, consult your JBL
specialist dealer for assistance.
If, however, the problem has
moved to the other speaker, then
the cause is in either a cable or
an electronic component.
IF THE SYSTEM PLAYS
A
T LOW VOLUMES BUT
SHUTS OFF AS VOLUME
IS INCREASED:
• Check all wires and connections
between the receiver/amplifier
and the speakers. Make sure all
wires are connected, and are not
frayed, cut or punctured. No
wires
or strands should be touching
each
other or the shorting straps con-
nected to other terminals.
• If more than one pair of main
speakers is being used, check the
minimum impedance require-
ments of your receiver/amplifier.
IF THERE IS LOW (OR
NO) BASS OUTPUT:
• Make sure the connections to
the left and right speaker termi
-
nals have the correct polarity
.
• In digital surround sound modes,
consider adding a powered
subwoofer to play the LFE (low-
frequency effects) channel of
the program.
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