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When switched on at the mains the power light is all that works

When switched on at the mains the power light comes on at the amp and the speakers make a loud crack. The power light is the only light on and the remote or manual controls only allow the amp to be turned on and off. You can't get anyting else to work.

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If your speakers are making this noise on switch on please disconnect them and check out if they the speakers are damaged by a continuity test of the impedance. It must show the marked resistance without a short. Then you are lucky. Next open the amplifier and check out on the output side and the power side for failure of mains capacitors/ output drivers/faulty coupling capacitors. Connect a resistance loaded test- speakers whenyou do this test .Switch on and put the set on fopr voltage checks from the output to the preamp. By a signal test you will be able to analyse the gain factor of all teh corresponding stages.It might be possible that your amp is old and some electrolytics have dried up.If so put the amp on for some considerable time and confirm if there is response building up on the controls and panels slowly. If so check onthe board for the suspected passive components and replace all suspected capacitors. Also resolder the main pcb for bad connectivity. I am surre this must work but attampt only if your are familiar to doing this repair. Good day

Posted on Jul 19, 2010

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Posted on Jan 02, 2017

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On the back panel there is a section labelled Patch Bay
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It would seem you have them both set the same at present. Set one to Monitor and one to Main, and use the corresponding Power Amp outputs direct to speakers.

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So, taking the usual mains power safety precautions....

Check that power from the wall socket is getting through to the amp. Use a multimeter to check the mains voltage as it comes in from the power cord. Also check the power is getting through the mains switch and on to the power supply board.

Disconnect the speakers and then power up the amp. If it comes on, then you've probably got either a cabling or speaker issue. Double check by trying the amp volume (no source, no speakers) and ramp it up slowly to 100%. If the amp still stays on then look at your speakers.

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