Question about Audio & Video Receivers
Techwood DDR94A gives "protect" message
I found the manual to the Techwood DDR94A at diplodocs.com
Posted on Jun 15, 2010
A problem has been detected in the final stage of the output amplifier. Remove the speaker wires and try again. If the problem persists, it is inside the amp. The most common cause of this is the output transistors. Expect a parts cost of between $15-$25 plus the local labor rate for the repair.
Posted on Apr 08, 2008
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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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