Question about JVC MX-KA3 CD Shelf System
I'm trying to help a friend of mine who has a JVC MX-KA3 stereo problem.
Upon plugging the system in, it enters standby mode just fine. The display cycles through various messages.
However, once any button is pressed and you try to get the unit to perform any function, it automatically shuts back down. It will display the "Good Bye" message and shut down.
I'm no expert, but I'm pretty handy with a soldering iron, etc so I am hoping someone here might be able to point me in the right direction to troubleshoot.
I have no Idea, I have My JVC system sitting in a closet. I got it in 2004, and It was working fine, and all of a sudden it stopped and went into protect mode. I have no idea what to do about it.
But this is what I did.
I unplugged it and I let it sit for 24 hours to see if it would Reset the microprocessor, that did nuttin'. So I took it apart ^_^ That was fun! and I checked all the wires for loose connections, and I made sure te cables were in there tight. My unit is a pretty old though, I have a surround sound system, but usually a good blast of canned air may clean the circuit board and the components.
Posted on Mar 23, 2008
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Posted on Jan 02, 2017
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Jun 22, 2014 | JVC MX-KA3 CD Shelf System
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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