Question about Yamaha P2500S Amplifier

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Protection of yamaha pc 2002

I have Yamaha power amp PC 2002 and one side stays under protection 10m more minits than the other side.After that amp works very well.Any idea or schematic for this model and also for model 2100 which gives me another problem.All regards

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Time delay... i dont know...seems unusual. the protection system of all yamaha PA and A/V is driven at teh same time not discrete so i dont understand why 1will be active earlier and the other delayed. in any case, a delay in relay activation is unstable center violtage or you are having an abnormal output stage, it is prducing more than 0.1 volts DC. this is primarily caused by unbalanced biased input initial stage of the main amp, voltage stability is not accurate. Or grounding getting poor.

redrivera

Posted on Mar 19, 2008

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Protect delay is in the relay and not adjustable as to delay time.
I would not worry unless no sound then may have to replace relay.

GOOD LUCK
BIG RED

Posted on Mar 04, 2008

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Yamaha RX V-795


Start with the process of elimination...disconnect speaker wires and (obviously) speakers. Does the amp still enter the protection mode? If not then check wires and speakers for issues. If the results are unchanged, look for protection circuit problems or "overlooked" power supply issues. Good luck...

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First check all speaker wiring to make certain there's no shorts.
Protection system come on if there's an overload. These are caused by shorts. If the speakers and wires are good then the only other cause is the main amp, possibly a transistor, has shorted.

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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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1 Answer

I have a Yamaha dsp ax1 when I turn the volume up the amplifier cuts out


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 '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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1 Answer

Yamaha DSP-AX1 ,. When turning on it only stays on about 4-5 sec. then shut off. Bob


Is this new equipment or a new problem on working equipment?


Register and download the manual for free at retrevo.com

http://www.retrevo.com/support/Yamaha-DSP-AX1-Amps-manual/id/319bh827/t/2/

See Troubleshooting Page 79

Impedance Selector in between settings

Generally speaking, an amp protects 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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1 Answer

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Hi
when you change the part on the power supply did you check that the voltage is the same as it should be.
maybe there is no voltage to the protection unit in this case the Amp will not power on
if you want to fix the Amp let me know
ecrdn@yahoo.com

Jack

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The amp will require service. One or more power transistors have failed and the protect circuit keeps the power supply from blowing your speakers

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