Question about Yamaha P2500S Amplifier

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Appears to be no output signal from P2500S

I connected an MP3 player to the 1/4" inputs with a stereo splitter cable. I then connected 2 6 metre 1/4" plugs to both the output sockets, turned the amp on and started playing an MP3. Now, when i turn the knobs on the front (the -dB ones) to the right, the "signal" LEDs flicker in time with the music. So far so good. I then connected an oscilloscope to the other leads from the output 1/4" jacks, and got no signal on the scope! Why? Is my amp broken or am i retarded? I'm planning on setting up a large stereo system for parties etc, and i want this thing working to drink some full range speakers. :( HALP NAO!!!xx

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  • xephiir Feb 02, 2008

    "to drink some full range" drive** some full range speakers
    Some crazy word assocation goin on when i was typing that there

  • xephiir Feb 02, 2008

    Ah, legend! I know what i was doing wrong. I was wiring the scope up to a 1/4" female solder terminal thingy i got from maplin, connected in turn to the output. Seems that its faulty, when i wired the scope directly to the jack i got a reading. Gorgeous. Im thinking ill turn the amp down and connect it to some passive speakers ive got in my attic, thing is theyre only at most 100W, so ill have to be a bit careful not to blow em. As i understand it though, speakers more usually blow when theyre more powerful than the amp.
    Cheers for the help anyway dude!

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Make sure you use the sleeve as ground reference on the 1/4" connector then check that aginst the ring and or tip and then you should see something on the oscilloscope. Let me know if that works. Have you tried hooking up some speakers? We can live chat if that help you any. Let me know Guru Jay

Posted on Feb 02, 2008

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