Question about Harman Kardon HK 3490
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Posted on Jan 02, 2017
SOURCE: HK AVR-247 protect mode
This is an indication of an internal problem. Typically this is shorted output transistors. Expect a parts cost in the $25-$40 range for this repair.
Posted on Apr 06, 2010
SOURCE: I've just bought HK AVR
This is clearly a manufacture defect right off the assembly line. From your description you have a serious intermittent problem with the AVR unit when it comes to selection and other choices and it will only get worse, I strongly suggest you return the item in favor of another.
Posted on Feb 09, 2011
SOURCE: My Harmon Kardon 3490 goes
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.
Posted on Aug 09, 2011
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