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Pioneer m-770 will not turn on

I have a pioneer m-770 amplifier and as i was playing music it turned off now wont turn on, i opened it and check to see what was the problem and one of the fuses was blown. i replaced it wth 250v fuse from radio schack but when i turned it on the fuse blew and then then i tried swicthing to a 125 v that belonged to the amp but the transistor blew also, i know for sure i need to replace that transistor but what about the fuse and why wont it turn on?

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  • mantk1078 May 25, 2009

    Yes i have the same problem in my pioneer M770 will not turn on because the fuse is blown, I replace the fuse with a different Amp.

    but was blew. Maybe something else is bad because i still have the problem.



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You probably have a short in the circuit some where. you need to replace the transistor and look at all the solder joints to make sure there not damaged or cracked. i have the same amplifier and i replaced the fuse several times and it blew every time up until the last time when the 4 of the power output transistors blew. what ever you do do not try and power it on till you do all the things i told you or you will have sparks and fire. my mistake cost me my amplifier. but might help you get yours repaired

Posted on Dec 24, 2007


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