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I have kenwood rxd 355. and i have a problem with "protect" text whowing. what to do?

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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 '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.

Check for loose speaker connections at the speaker as a root cause for
intermittent shutdown.

Posted on May 28, 2011

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