Question about Yamaha P2500S Amplifier
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
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.
Posted on Mar 19, 2008
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.
Posted on Mar 04, 2008
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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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