Crown Audio 280MA Troubleshooting, Possible Reason, Commercial Audio Series Mixer-Amplifiers

Commercial Audio Series Mixer-Amplifiers

3 Troubleshooting

CONDITION: No power to the mixer-amplifier.

POSSIBLE REASON:

• The mixer-amplifier’s Power switch is off.

• The mixer-amplifier is not plugged into the power receptacle.

• The mixer-amplifier’s high-voltage power sup- ply circuit breaker has tripped, or the fuse has opened on 220/230/240V models. Verify that the AC mains voltage is correct, then press the Reset button on the back panel.

• If the unit is operated from a 24V DC supply, the internal fuse may have opened. (The power switch has no effect on 24V operation.)

CONDITION: Distorted sound.

POSSIBLE REASON:

• Input signal level is too high. Turn down your input volume controls. NOTE: Your mixer- amplifier should never be operated at a level which causes the Clip LEDS to illuminate con- stantly.

• Master volume level is too high. Turn it down to about 3/4 of maximum level.

CONDITION: No sound.

POSSIBLE REASON:

•The amplifier is in “fault” mode. A Fault status can be triggered when one of the amplifier’s protection circuits is activated. First disconnect your speakers from the affected channel(s) one by one to determine if one of the loads is shorted. If an amplifier channel has a thermal fault, there will be no indication on the front panel, but the amp will recover after cooling. If operation does not return to normal after restarting your amp, check the fuse and replace if necessary, or return mixer-amp to Crown or an authorized Crown Service Center for servic- ing.

•No input signal.

•Input signal level is very low.

page 14 Operation Manual