Question about Audio & Video Receivers
Protect mode happens when the amp detects a problem internally and shuts down to prevent further damage. The most common cause of this is shorted output transistors. Without takeing measuremetns inside the unit, I can not state the specific problem, but a repair for this is relatively simple. Expect a cost of $15-$40 for parts plus the local labor rate.
Posted on Mar 28, 2008
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F61 usually means the amp has detected a short or a severe microprocessor error.
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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