Question about Yamaha P4500 Power Amplifier 2-Channel

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P4500 yamaha amp

Amp gave out a large hum type sound in the speakers sound went out came back both speakers could not produce highs and amp was not driving out power like normal

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First check your input cable-disconnect it and check if the problem finished---you will have a problem in input(cable or device)-start with another cable then your input device.
if the problem still check your out put cables(speakers cables)for short circuit or touch the bare wire with amplifier body.-try to clean volume controls with spray contact cleaner---confirm good connection in amplifier rear and in speakers rear.

Posted on Aug 25, 2008

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Power supply output for Yamaha p4500 secondary output for the power supply so that i could check the voltage


Hi Joel, although we've sourced detailed schematic for this P4500 amplifier, there are no many voltage details on it for manufactures sake. Anyway, mine findings are. Secondary winding on main transformer should supply no less than 2 x 75 volts which makes after rectifying and filtration no less than 2 x 90 volts on capacitors with amplifier without input signal. Also transformer has to be very "hard" , otherwise amp will start clipping before reaching stated wattage on output.

Oct 17, 2011 | Yamaha P4500 Power Amplifier 2-Channel

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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.

Oct 07, 2011 | Yamaha P4500 Power Amplifier 2-Channel

1 Answer

Hi We have an Allen & Heath Mixing Desk connected to two Yamaha P4500 audio amplifiers (via graphic EQ and compressor/limiter) which power the 4 main and 4 side speakers in our church. We now want to...


'Splitting' leads is never the best way to distribute a signal. The best solution is to use the parallel inputs of the Yamahas to chain them together: mixer to amp1, amp1 to amp2, amp 2 to the Cloud. You should only need to use one input on the Cloud to drive all the channels, using the input switches at the rear.

Let me know if you need any clarification on this.

Sep 21, 2011 | Yamaha P4500 Power Amplifier 2-Channel

1 Answer

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.

Jul 03, 2011 | Yamaha P4500 Power Amplifier 2-Channel

1 Answer

Yamaha p4500 keeps blowing both ET5AH250V fuses help?


Suspect an overload in the power section, or more likely the main amp. A semi-conductor device is now acting like it was a piece of wire. Easy to spot with an ohm meter, it will just like you have touch the test probes together! My guess it will be one or more of the things on the big heatsink that's gone.

Jan 24, 2011 | Yamaha P4500 Power Amplifier 2-Channel

1 Answer

I have a Yamaha M-70 amp. The left channel cuts out. A rap on the case gives an instant signal to the speaker. I've tried swapping the inputs and also the speakes without any luck. Any ideas? Thanks.


There is a bad soldering joint somewhere. Take the top off and follow the speaker connections from where the left speaker connects. Keep an eye out. If you can get the bottom off, look at the PC board solder joints. If in doubt resolder them.

Nov 07, 2010 | Yamaha P4500 Power Amplifier 2-Channel

2 Answers

Shashij_2001@yahoo.com


TURN THE BALANCE CONTROL IN THE MIDLE

Jul 06, 2010 | Yamaha P4500 Power Amplifier 2-Channel

1 Answer

One channel does not receive signal as shown by the led.oudtput stage is perfect the amp is a Yamaha P4500 poer amp


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

Mar 06, 2010 | Yamaha P4500 Power Amplifier 2-Channel

1 Answer

My Yamaha P4500 burned my speakers rated 500 watts.The clip lite did not lit, so I pressumed it is operating normally


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.

This fake rating is to sell speakers and depends upon average music programing that does not have continuous high level.

Get professional speakers in MATCHED cabinets that have CONTINUOUS pwer ratings above what the amp can produce. ALSO suggest you put fuses in your speaker leads to protect the speakers.
WITHOUT proper cabinets, the speakers can be blown.

You should probably get a sound level meter to check that you are not damaging your ears. No fun in later life requiring expensive hearing aids! There are professional quality meters for about $140 on eBay.

Nov 02, 2009 | Yamaha P4500 Power Amplifier 2-Channel

1 Answer

Yamaha p4500 protect lights do not go off at power up


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.

Dec 02, 2008 | Yamaha P4500 Power Amplifier 2-Channel

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