Question about Yamaha P4500 Power Amplifier 2-Channel

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Yamaha p4500 protect lights do not go off at power up

When i power up the amp, the protect light comes on and does not go off. Ive left the unit on for some time and nothing changes. The amp is not connected to anything at the moment so there cannot be any short circuits or anything although when i originally removed the amp i realised someone in the venue had taken the speaker connectors out of the speak and twisted them together!!

Any idea how i reset the amp?

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  • devilofadj Dec 02, 2008

    the amp is no longer connected to anything - i have it at home now, just plug it in with nothing attached and the protect light comes on and stays on .
    The wires i untwisted straight away of course in the club! We have a different amp powering them now and its all fine


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You only normally get that when the Volume over peaks, and the amp will automatically cut out to prevent it fron blowing the whole P.A up.
If you know it was working fine before the wires were twisted together, then best try undoing what was done, and making sure that the Amp's Volume is turned down to minimum.

Posted on Dec 02, 2008

  • Gav Shaw Dec 02, 2008

    Actually I just managed to find the User Manual for it :-), it's in PDF format, so you'll need to download and install Adobe Acrobat Reader if you have not got it already.
    You can download the Manual from here >

    http://www.yamaha.co.jp/manual/english/r...

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Yamaha p4500 in protection mode


The manual says the heat sink is too hot or an unacceptable DC voltage was sensed going out.

http://www.retrevo.com/support/Yamaha-P4500-Amps-manual/id/962bh144/t/2/

Generally speaking, an amp attempts to protect itself from heat, shorts, overloads and operator exuberance by refusing to turn on or stay on; or it may turn on but produce no audio to the speakers.

Overloads can be from excessive periods of high output or marginally low impedance loading by the speakers; and shorts would be wiring issues or a speaker blowing up.

You should be able to feel if it's hot. WHY is it overheating? Make sure it has sufficient ventilation on all sides and that vent holes are not blocked by dust balls. Ensure the fan (if equipped) is running as designed (some only operate on demand). Clean dust and debris from it.

If the amp comes back on after cooling, you're lucky. They only have so many self-protection cycles in their lives so continuously resetting or cycling their power without addressing the cause can do more harm than good.

If it protects immediately on a cool power up you should disconnect the speaker connections and try it 'nekkid'. If it comes up then diagnose which lead(s) are shorted. If it does not come up the problem is internal and should be left to an experienced and competent hands-on tech.

Check for loose speaker connections at the speaker as another possible root cause for intermittent shutdown.

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Protection signal is permanently one. Non output sound.


Generally speaking, an amp attempts to protect itself from heat, shorts, overloads and operator exuberance by refusing to turn on or stay on.

Overloads can be from excessive periods of high output or marginally low impedance loading by the speakers; and shorts would be wiring issues or a speaker blowing up.

You should be able to feel if it's hot. WHY is it overheating? Make sure it has sufficient ventilation on all sides and that vent holes are not blocked by dust balls. Ensure the fan (if equipped) is running as designed (some only operate on demand). Clean dust and debris from it.

If the amp comes back on after cooling, you're lucky. They only have so many self-protection cycles in their lives so continuously resetting or cycling their power without addressing the cause can do more harm than good.

If it protects immediately on a cool power up you should disconnect the speaker connections and try it 'naked'. If it comes up then diagnose which lead(s) are shorted. If it does not come up the problem is internal and should be left to an experienced and competent hands-on tech.

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Shashij_2001@yahoo.com


TURN THE BALANCE CONTROL IN THE MIDLE

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Try reverse connecting the channels, in order to locate where is the problem; at the cables or at the amplifier.

In case of a problem or clarification, don't hesitate to post.

Thanks and regards
Please kindly rate this solution
Stelios

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Chances are your speakers were "fake rated" as are most consumer quality speakers.

Unless the speakers were rated for CONTINUOUS power at 500 watts each you could easily destroy them with that amp.

Check the DC bias out of the amp. If it is under a volt, your speakers were fake rated.

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WITHOUT proper cabinets, the speakers can be blown.

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Hi...
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