Question about Yamaha HTR-5550 Receiver
The protection circuit kicks in after one hour approximatly even if it has been used at very low output power. It is certantly not too much current drawn by the speakers. What electronic components could be at fault. I know a bit the electronics and I could repair the faulty component if I could know what it is. I have no circuit diagram to refer to. Faulty capacitor?
I would be checking about the regulator and power output stages for dry solder joints. With the progressive heating of the unit from operation, failing solder joints may be causing a condition to occur that operates the protection circuit. Careful inspection under good light is required. You may find soldering around outputs, drivers and other devices mounted on heat sinks or other devices that run hot to have circular fractures in the solder about the lead to be commonly responsible for the problems you are facing., if you have a soldering suitable iron, and the time and patience, go for it. I have included a link to a soldering guide here.
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Posted on Mar 16, 2008
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Posted on Jan 02, 2017
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Jun 03, 2011 | Yamaha HTR-5830 Receiver
Register and download the manual for free at retrevo.com
Page 25 discusses the minimum speaker impedance setting for expected lower-than-8-ohm loads. Running A AND B may present a load that is dangerously low. BTW: 6 is not a whole lot lower than 8.
Look at your speakers' impedance specs. Running them in parallel would present a much lower load than either pair alone.
Generally speaking, an amp protects itself from heat, shorts, overloads and operator exuberance by refusing to turn on or stay on.
You very well may have blown and amp or a speaker.
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. Eure 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
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