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Yamaha M-70 protection
Yamaha M-70 protection
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Old 2nd October 2005, 11:50 PM   #1
ostie01 is offline ostie01  Canada
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Join Date: Mar 2005
Location: quebec
Default Yamaha M-70 protection

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
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Old 3rd October 2005, 07:24 AM   #2
djk is offline djk
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Bad electrolytic caps in the relay circuit, replace them all.
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Old 28th December 2005, 02:58 PM   #3
spongebob-2005 is offline spongebob-2005  Germany
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Join Date: Oct 2005
Default same problem

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
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