Question about JVC HX-D7 Shelf System
Hi, i have the same problem wiht my jvc where protection shuts of the system off with the speakers disconnected, there seemes to be no damage to the resistors or any other component around the amp ic, is there any way i could test it to make shure that the amp ic is bad?
You'll need a voltmeter. Check for the absence of DC voltage at the amp ic's outpit pins under no signal conditions. Note, you need to check the output pins of the ic, not at the speaker terminals, as a relay would lift the speakers off circuit in the event of a DC potential being present at outputs, to protect speakers.
Posted on Mar 26, 2008
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Posted on Jan 02, 2017
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Generally speaking, an amp protects itself from heat, shorts and overloads 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 '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 and competent hands-on tech.
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