EAW CAZ2500 Benutzerhandbuch

 – CAZ Series

Sound system diffi culties usually fall into one of the 
following categories.

•   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 amplifi er) is high enough to produce sound in 
the amplifi er. 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 amplifi er has gotten extremely hot, the thermal 

protection circuit may have activated. Allow the amplifi er 
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.

•   The power amplifi er 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 amplifi er.

•   Loudspeakers not working properly.

•   Incorrect EQ settings in the electronic equipment. Ensure 

all EQ settings and fi lters on the mixing console or 
preamplifi er and on other equipment are set for normal 

operation. Ensure level controls on electronic crossovers 
and associated amplifi ers 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.

•   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 amplifi er have  blown. These are not a 

user-serviceable. See next page about service.

•   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 line-level cabling.

•   Check the polarity of the speaker cable connections. You 

may have your positive and negative reversed at one end of 
one speaker cable.

•   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. 

•   Check the signal cable between the mixer and the 

amplifi er. Make sure all connections are good and sound.

•   Make sure the signal cable is not routed near AC cables, 

power transformers, or other EMI-inducing devices.

•   Is there a light dimmer or other SCR-based device on the 

same AC circuit as the amplifi er? Use an AC line fi lter, or 
plug the amplifi er into a different AC circuit.

•   If possible, listen to the signal source with headphones 

plugged into the console. If it sounds noisy there, the 
problem is not in the amplifi er.

•   Is there a cable-TV audio feed in your system? An incorrect 

ground may causes a "ground loop" hum.