Question about Audio Players & Recorders
Posted by Anonymous on
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Posted on Jan 02, 2017
SOURCE: Technics amp hd81 shows fault
IS it the amp fan failing? It could be something simpler and cheap.
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 '*****'. 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.
WE don't fix things, nor do we provide parts. We provide advice and answers and usually simple direction for where to look for answers, which are usually available somewhere on the Internet.
You can find the Service Manual (not necessarily for free) by web searching "Technics HD81 Service Manual". It will identify the fan part number. Then web search for THAT.
Only YOU know where you are so we can't point you to a repair tech. labor charges will vary. Once again, web search.
Posted on Aug 07, 2011
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