SOURCE: yamaha surround sound amplifier wont stay turned
The amplifier MAY be sensing a DC imbalance and turns off to protect the speakers. This would be an electronic defect..
If you can temporarily disconnect the speakers and see if power will remain on... If it will, take amp in for servicing.
SOURCE: McIntosh MC7106 Amplifier not powering up
It can be a variety of reasons but I feel that your amplifier is shutting off after powering on. There is nothing that can be done from the outside but If you are familiar with basic electronics and can attempt to take a look I can try. Open the set after you have pulled off the power, then look into the set and tighten all the connectors and cords. Power on and see where the click comes and goes off. If the relay is not holding on then your protect circuit is shutting it off. Armed with a multimeter turn on the power and check if the main +B power is coming to the output stages.If there is momentary swithch on , then disconnect power and test the continuity in the output stages. If hsort open the leads to the output section and then power on. If the relay stays we have found the fault. you can go on to change the failed outputs. If however the outputs were tested ok, then your fault could be the relay or the protect circuit, Hold a rely for a moment to see if the amplifier powers on, if so check the relay drive transistor , the biasing to the stage. Try this out and I hope my advice helps. Good day
Check your input or output cables might be dirty I had the same problem
and 1 of my output wire was dirty so i sprayed tha electric cleaner and its all good now
Aloha
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The problem will NOT be the capacitors. I have repaired piles of these and have NEVER seen a bad cap in one. These are class D power amplifiers and can be difficult to diagnose and repair. You can unplug the main power supply connector from each channel one at a time and see if it comes on. BUT YOU MUST DISCHARGE THE POWER SUPPLY BEFORE MOVING ON TO THE OTHER CHANNEL!!!
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