Question about Marantz SR7500
The headphone jack of our SR7500 just stopped working last night in middle of a movie. The unit use to click and switch the sound to the headphones whenever we inserted headphones into the jack. Now nothing happens when we insert headphones. Sound never changes over. I've tried putting in different headphones with no luck. Has something burned out in our unit? Is there a quick fix? I tried unplugging and plugging back in, but no luck either.
There is a contact inside the jack that is closed when the plug is inserted. Apparently this is no longer happening. This should be an easy repair for a qualified technician.
Posted on Feb 26, 2009
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Mar 19, 2011 | Marantz SR7500
Generally speaking, an amp protects 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 '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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