Question about Yamaha HTR-5990 Receiver
The unit is most likely getting too hot. Check your speaker cables for frayed wires that may be touching each other. The amp will continue to work, but work much harder into a lower impedence load. Over time this will damage the amp. If the cables are OK, try running the amp with the speaker wires disconnected. If the unit still behaves the same way, there is a problem internally with the output section that should be corrected ASAP.
Posted on Mar 31, 2008
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Generally speaking, an amp protects itself from heat, shorts and overloads.
Overloads can be from excessive periods of high output 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 hands-on tech.
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