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TROUBLESHOOTING
Fault Possible Causes/Rectification
No Power
• Make sure the power cord is securely seated in the IEC socket and plugged
all the way into the AC outlet.
• Make sure the AC outlet is live (check with a tester or lamp).
• Make sure the front panel POWER switch is in the ON position.
• If nothing is illuminated, and you are certain that the AC outlet is live, it will
be necessary to have your amplifier serviced. There are no user serviceable
parts inside. Refer to “Fault Chart” on the next page to find out how to
proceed.
No Sound or Low Output
• Loudspeaker cables or connectors are not wired correctly or they are faulty.
Check all cabling, referring to these instructions for the correct connections.
The best way to check a suspect cable is to swap it with a known good cable.
• Loudspeaker is not working. Connect the loudspeaker cable to a known good
loudspeaker leaving all equipment set to the same levels. If the problem
disappears, the loudspeaker is probably not working correctly.
• Are the channel Level controls turned up? Slowly turn them up and see if you
hear any-thing.
• Is the signal source turned up? Make sure the signal level from the mixing
console (or whatever device immediately precedes the amplifier) is high
enough to produce sound in the amplifier. The SIG LEDs should be blinking
to indicate that signal is present.
• If the speakers are wired for BRIDGE mode, make sure the AMP MODE
switch is set to BRIDGE.
• If the amplifier has gotten extremely hot, the thermal protection circuit may
have activated. Allow the amplifier to cool down and normal operation should
resume.
• Are there fuses in the speakers, or in-line fuses in the speaker wire? Check to
see if they’re blown.
• Check that if fuse on Power-amp module is blown
Distorted Sound
• The power amplifier is clipping. The signal level is exceeding the limits of
your system and you must reduce the level from your mixer or signal source.
• Ensure that no equipment in the signal chain is being over driven. For
example: input(s) or summing bus in the mixing console, equalizers etc.
• Is the input connector plugged completely into the jack? Check the speaker
connections and verify that all connections are tight and that there are no stray
strands of wire shorting across the speaker terminals.
• If possible, listen to the signal source with headphones plugged into the
console. If it sounds bad there, the problem is not in the amplifier.
• Loudspeakers not working properly.
Partial Sound (frequency band missing)
• Incorrect EQ settings in the electronic equip-ment. Ensure all EQ settings and
filters on the mixing console or preamplifier and on other equipment are set
for normal operation. Ensure level controls on electronic crossovers and
as-sociated amplifiers are correctly set and that all cables and connections for
such equipment are connected and working properly.
• Loudspeaker not working properly. Swap with a good one.
• Is the POWER ON LED illumi-nated? If not, make sure the AC outlet is live.
• The fuses inside the amplifier may have blown. These are not a user-
serviceable.
One side is louder than the other
• Are both Level controls set to the same posi-tion?
• Check your source signal to make sure the left and right signals are balanced.
• Are the speaker impedances matched? Differ-ent speaker loads can cause
different volume levels on each side.
• Try switching sides: Turn off the amp, swap the speaker cables at the amp,
turn the amp back on. If the same side is still louder, the problem is with your
speaker cabling. If the other side is louder now, the problem is with the mixer,
the amp, or the line-level cabling.
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