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Simple Fault Analysis of Public Broadcasting Power Amplifier


The most important feature of a good power amplifier is its superior sound quality and durability, which can meet the needs of listening to high-quality music over and over again. However, what should we do if we encounter a minor problem with the power amplifier?

basic processing methods of power amplifier machine:

1. No electricity: check whether the power line to the safety tube is unblocked, whether the power line is broken or the safety tube is in poor contact, and the safety tube is burned out, that is, check whether the rectifier bridge or wire and other components of the power amplifier rectifier power supply are bad, such as the rectifier diode or bridge are piled up and replaced with good components, and then check other lines, such as the power amplifier tube.

2. The signal indicator light flashes normally but there is no sound output: first check whether the horn unit is normal. If it is normal, check whether the horn lead is normal, I .e. check whether the terminal is in good contact. If it is normal, open the case and visually check whether the ear can hear or see whether the output relay is closed. If it is normally closed (if there is a universal meter), measure whether the front input end and output end of the circuit breaker are straight through, if it does not work, the contacts in the relay will be oxidized to spark carbon, and the relay will be replaced normally.
3. The power lamp indicates normal silent output, but the sound of the output relay is heard: first use a universal meter to measure whether the power supply of the power amplifier is normal. If it is normal, that is, if you hear a loud current sound at the signal terminal of the signal input terminal, you can initially determine whether the amplification part of the other rate is normal, that is, whether the purity of the light shaking signal cannot be triggered or is contact sterile, if it is contact sterile, that is, when measured with a universal meter, it is normal to deal with the fault of that line.

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