Crown Audio 280MA, 180MA Troubleshooting, No input signal Input signal level is very low

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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.

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Operation Manual

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Contents Some models may be exported under the name Amcron 180MA280MA Important Safety Instructions Use only with a cart, stand, tripod, bracket, orCrown International, Inc Safety StandardDeclaration of Conformity European Representative’s Name and AddressTable of Contents Features WelcomeOutput Signal Presence Indicator Input Volume ControlsOutput Volume Controls Clip IndicatorAmplifier Outputs Connectors Back Panel Controls and Connectors Reset SwitchAuxiliary Power Input Amp Config SwitchHow to Attach Rack Ears SetupInstallation Choose Input Wire and Connectors Choose Output Wire and ConnectorsOutputs Maintain proper polarity +/- on output con- nectors Wire Your SystemTypical input and output wiring is shown in Figure How to link another mixer to your mixer-amplifier Phantom PowerLink In/Out Switches How to set up Music-On-Hold outputIncluded Accessories Remote Volume ControlPowering Up Optional AccessoriesBlock Diagram 280MA Block DiagramTroubleshooting No input signal Input signal level is very lowSpecifications Service Warranty 12/01Worldwide Except USA & Canada Type of credit card City State/Prov Postal Code CountryCredit card information MasterCard Personal/Consumer Visa

180MA, 280MA specifications

Crown Audio has established itself as a leader in the professional audio industry, and its 280MA and 180MA models epitomize its commitment to high-quality sound reinforcement. These amplifiers are designed for a range of applications, including commercial audio, live sound, and installation, providing unmatched performance and reliability.

The Crown 280MA is a robust two-channel amplifier that delivers an impressive power output of 280 watts per channel at 4 ohms. Its engineering focuses on efficiency and clarity, making it an excellent choice for any scenario where quality audio is essential. One of its standout features is the built-in mixer, which allows users to connect multiple audio sources seamlessly. This mixing capability is especially beneficial in environments such as restaurants, schools, and places of worship, where different audio sources may need to be balanced and controlled easily.

On the other hand, the Crown 180MA offers a more compact design but does not compromise on performance. With a power output of 180 watts per channel at 4 ohms, this model is perfect for smaller venues or setups. Like the 280MA, the 180MA also includes a built-in mixer, ensuring versatile audio management. Both models feature a streamlined user interface, enabling intuitive operation and quick adjustments.

Both amplifiers incorporate advanced technology such as Crown's proprietary DriveCore technology, which enhances power efficiency while reducing distortion. This technology allows the amplifiers to deliver clean, transparent power without the weight typically associated with traditional designs. The lightweight nature of both models makes installation and transport straightforward, adding to their practicality for sound engineers and event organizers.

The overall construction of the 280MA and 180MA is rugged, built to withstand the rigors of professional use. Features such as short-circuit protection, thermal protection, and overload protection ensure long-term reliability, even in demanding environments. Furthermore, the amplifiers offer flexible input options, including line-level and microphone inputs, allowing users to connect various audio sources without hassle.

In conclusion, the Crown 280MA and 180MA amplifiers represent a perfect blend of power, efficiency, and advanced technology. Their built-in mixers, robust protection features, and lightweight designs make them highly versatile for a wide array of applications. Whether used in commercial settings or live sound environments, these amplifiers ensure that the audio experience remains top-notch, reinforcing Crown Audio's reputation as an industry leader.
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