10. TROUBLESHOOTING
Sound system difficulties usually fall into one of the following categories.
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. Read the loudspeaker’s input panel to verify correct cable connections.
•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 anything.
•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
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 equipment. Ensure all EQ settings and filters on the mixing console or preamplifier and on other equipment are set for normal
14 – CAZ Series
operation. Ensure level controls on electronic crossovers and associated 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.
No Power
•Make sure the AC outlet is live and the POWER switch on.
•Is the LED next to the POWER switch illuminated? If not, make sure the AC outlet is live.
•Has the BREAKER switch popped?
•The fuses inside the amplifier have blown. These are not a
One side is louder than the other
•Are both Level controls set to the same position?
•Check your source signal to make sure the left and right signals are balanced.
•Are the speaker impedances matched? Different 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
Poor Bass response
•Check the polarity of the speaker cable connections. You may have your positive and negative reversed at one end of one speaker cable.
As the music gets loud, the amp shuts down
•Make sure the OL LEDs are not lighting continuously. If so, turn down the signal source or the amp Level controls.
•Can the amp breathe? It needs plenty of fresh air to stay cool. Do not block the ventilation holes.
Noise/Hum
•Check the signal cable between the mixer and the amplifier. Make sure all connections are good and sound.
•Make sure the signal cable is not routed near AC cables, power transformers, or other
•Is there a light dimmer or other
•If possible, listen to the signal source with headphones plugged into the console. If it sounds noisy there, the problem is not in the amplifier.
•Is there a