Yamaha M-70 protection

[ostie01]

Hi, everybody.Just asking if someone have experienced that kind of problem with protection on a Yamaha power amplifier. When I turn on the amp ,the protection stays on for some time and then shut off, but this happen only maybe 10 to 15 minutes after I turn on the amp, not the 5 to 7 seconds it's normally take.All output transistors are good. Only 5 to 10 millivolts at the output.If you have any idea, just let me know. Thanks

 

[djk]

Bad electrolytic caps in the relay circuit, replace them all.

 

[spongebob-2005]

same problem

Hi,
I had the same problem with an Yamaha-amplifier.
I replaced a small broken electrolytic cap which had lost capacity in the protection circuit. Now it works.

- Boris