Crown Audio D-75A, D-45 operation manual Troubleshooting, Condition Power indicator is off

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D Series Power Amplifiers

5 Troubleshooting

CONDITION: Power indicator is off.

POSSIBLE REASON

• The amplifier has lost AC power.

• The amplifier’s Power switch is off.

• The amplifier is not plugged into the power receptacle.

• The amplifier output level is so high that the power supply fuse has blown. Verify that input levels and output impedances are within safe ranges. Refer the unit to an authorized Crown service center for fuse replacement.

CONDITION: No sound, even though the amp has power. Power LED is on and

the amp is receiving an input signal. Signal indicator is flashing.

POSSIBLE REASON:

•Speakers not connected.

•Open circuit due to speaker failure.

• There is a short on the amplifier output. First disconnect your speakers from the affected channel(s) one by one to determine if one of the loads is shorted.

CONDITION: Distorted sound.

POSSIBLE REASON:

•Load is wired incorrectly.

•Input signal level is too high. Turn down your amplifier level controls, or turn down the input signal, until the clip light goes out.

Note: If the signal sounds distorted even though the Clip LED is off, the input signal is distorted. Check gain staging and output lev- els of the mixer or preamp.

CONDITION: No input signal.

(Signal indicator is not flashing even though audio is applied).

POSSIBLE REASON:

•Input signal level is very low.

•Level controls are turned down.

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Operation Manual

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Contents 75A Some models may be exported under the name AmcronWatch for These Symbols Important Safety InstructionsSeries amplifiers require Class 2 output wiring Use only with a cart, stand, bracket, or tableCrown International, Inc Safety StandardDeclaration of Conformity European Representative’s Name and AddressTable of Contents Welcome FeaturesHow to Use This Manual Detented level controls for precise repeat- abilityManual SetupUnpack Your Amplifier Install Your Amplifier Crown recommends using professionally con- structed, high Choose Input Wire ConnectorsChoose Output Wire and Connectors Inputs Connect input wiring only to CH Wire Your System Dual ModeBridge-Mono Mode Connect to AC Mains AC Mains Voltage Configura TionStartup Procedure Turn up the level of your audio source to an optimum levelPrecautions OperationControls, Indicators and Con- nectors Front and Back ViewsControls IndicatorsFuse Replacement Input-Sensitivity Option ProtectionOptions Bridge-Mono Option Troubleshooting Condition Power indicator is offSpecifications KHz KHz 20 Hz 50 Hz DualBridge-Mono 105 145 50 Hz KHz 20 Hz Dual 120Service Warranty Items Excluded from this CROWN- Warranty Worldwide Except USA & CanadaSeries Power Amplifiers Crown Factory Service Information Nature of ProblemThis page Intentionally Left Blank Series Power Amplifiers

D-45, D-75A specifications

Crown Audio has earned its reputation as a leader in professional audio solutions, with a commitment to delivering high-quality amplifier technology that meets the demands of audio professionals across various applications. Two notable models in their lineup are the Crown D-75A and D-45, both of which embody unique features that are tailored for versatility and superior performance.

The Crown D-75A is a high-performance power amplifier designed for applications where exceptional sound quality is essential. With an output power of 75 watts per channel into 8 ohms, this amplifier is capable of driving a wide range of loudspeakers, making it an excellent choice for installations in commercial venues or high-end residential systems. One of its standout features is the ability to operate in both stereo and bridged mono modes, allowing for flexible configuration options. The D-75A also incorporates Crown’s patented Class I technology, which enables it to maintain high efficiency while minimizing distortion and heat generation.

On the other hand, the Crown D-45 offers a slightly lower output power, rated at 45 watts per channel into 8 ohms. Despite its smaller size, the D-45 packs a punch with its robust performance and advanced technologies. This amplifier is well-suited for smaller venues or as a part of an audio system where space is a concern. Just like the D-75A, the D-45 features the ability to run in stereo or bridged mono modes, providing users with flexibility in setup.

Both amplifiers incorporate user-friendly front-panel controls, including level adjustments and power indicators, allowing for easy operation and monitoring. Furthermore, they are engineered with short-circuit and thermal overload protection, ensuring longevity and reliability in demanding environments.

In terms of connectivity, the D-75A and D-45 come equipped with professional-grade XLR and RCA input options, facilitating seamless integration into various audio systems. Their durable construction is designed to withstand the rigors of professional use, while also being aesthetically pleasing for any installation.

In conclusion, the Crown Audio D-75A and D-45 amplify the brand’s commitment to quality and innovation, providing professionals with dependable solutions that do not compromise on sound fidelity. Whether for a small venue or a large installation, these amplifiers deliver the performance and features audio engineers seek, making them an excellent choice in the competitive world of sound reinforcement.
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