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Soundsource speakercraft4/3/2023 Over time with the audio sense active this initial pulse from the transformer at power up sees off the amplifier chip and in many cases damages the PCB links between the double sided print making it impossible to remedy the exsisting module, so replacement is the only option. In breif the issues are down to the transformer secondary windings delivering slightly over spec voltage to the modules. There are 6 stereo class D modules using the TDA8970 design. There is however a number of these which are starting to come through with amplifier modules that fail. The Vital 1250 is a class D amplifier designed to deliver 170watts per channel (x12) at 4 ohms impedence. If it does not come up the problem is internal and should be left to an experienced and competent hands-on tech.Ĭheck for loose speaker connections at the speaker as another possible root cause for intermittent shutdown. If it comes up then diagnose which lead(s) are shorted. If it protects immediately on a cool power up you should disconnect the speaker connections and try it 'naked'. They only have so many self-protection cycles in their lives so continuously resetting or cycling their power without addressing the cause can do more harm than good. If the amp comes back on after cooling, you're lucky. Ensure the fan (if equipped) is running as designed (some only operate on demand). WHY is it overheating? Make sure it has sufficient ventilation on all sides and that vent holes are not blocked by dust balls. ![]() Overloads can be from excessive periods of high output or marginally low impedance loading by the speakers and shorts would be wiring issues or a speaker blowing up. Generally speaking, an amp attempts to protect itself from heat, shorts, overloads and operator exuberance by refusing to turn on or stay on.
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