Troubleshooting of constant voltage power amplifier

July 18, 2022

Generally, when the public broadcasting power amplifier fails, the user will return to the manufacturer for repair. This is the user's right and the manufacturer's obligation. There is no problem at all. However, because repairing takes time after all, it will delay a lot of things for many urgent users. Let us introduce some simple troubleshooting knowledge of public broadcasting power amplifiers. If your broadcasting power amplifier fails, you can also detect it yourself. If the problem is solved, it will save a lot of unnecessary time and freight. Even if it is not solved, you can probably find out where the problem lies. This will also speed up the processing time by directly communicating with the manufacturer.
Power Ampifier

1. The device is not powered on. When this happens, first check whether the power supply can be connected to the fuse tube, whether the power cord is in good condition, whether there is poor contact with the fuse tube, etc.; if the fuse tube burns, check whether the components in the broadcasting equipment are damaged. If you can't replace it by yourself, please contact the manufacturer.

2. There is no sound but the signal light is normal. When this happens, first check the speaker unit and then check the speaker leads. If everything is normal, open the case to see if the output relay is closed, and then check whether the input terminal of the relay is connected to the output terminal. If there is a fault, repair it. If not, check the signal. Whether the lead wire is in poor contact, the faulty wire can be replaced.

3. The sound is loud and small. This phenomenon may be caused by poor contact of signal lines, poor contact of potentiometers, signal coupling capacitors, and poor contact of feedback resistors.

4. Pure power amplifier sound is distorted. See if there is a soft breakdown of the power tube, the positive and negative voltages have no voltage or become low, and the resistance changes.

5. The sound level indicator light does not work. When this happens, first measure whether the voltage is normal, whether the signal is sent, and then check whether the components are damaged.

The PA loudspeaker system can provide call, message, background music, and alarm functions to remind people living in the same building or different buildings, or remote people to pay attention. Public address systems can meet a variety of different usage needs. But regardless of the purpose of use, the clarity of the audio and the effect of the broadcast are the most important. To this end, it is particularly important to understand the basic architecture of a public address system. This manual will help you plan your own public address system in easy-to-understand words, as well as help you set up suitable amplifiers and speakers so that they can function properly.

The equipment of general public broadcasting system is mostly combined function equipment, such as: preamplifier, power amplifier, speaker equipment and so on. It can be combined into different systems according to the application requirements, or can be used independently as a single piece, or used in combination with similar standard products of different companies.

The public address system equipment includes: signal source, input processing equipment, power amplifier equipment, loudspeaker, output switching unit, line interface unit, power supply, structural installation assembly, etc. Now a brief introduction of each part of the product is made.

Audio equipment

Audio source equipment refers to the equipment that provides the initial electro-acoustic signal for the system, generally there are; tape recorder, phonograph, tuner, etc. Usually the output signal level of the audio source device is very low, and an amplifier needs to be added to amplify the level and power to drive the speaker to produce sound.

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Ms. Silvia

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