Question about NAD T752 Receiver

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NAD T752 Hi, When powering up, about 4 second after, the amp turn in protection mode. Nothing is connected to the anp and it is clean from any metal dust. I found one transistor to be very hot. It's one of the ones cooled by a high and slim silver color heat radiator (they are 4 or five of these grouped togheter) Thanks, I can give more details or photo if possible or needed Francois

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  • 151 Answers

It could be entering protect mode because it has no speakers wired to it, have you tried connecting to all 6 speaker - out connections. Often, if an amp can't detect a load on all 6 channels it won't work. Also, have you checked the thermal fuses? a blown fuse could cause this problem.

Posted on Apr 07, 2011

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Posted on Jan 02, 2017

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If your NAD amplifier is in protect mode with no speakers connected, it will be necessary to open it up and check for internal component failure.

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Powers on in standby mode but shuts off when anything is pressed remote or manually? t-752 reciever


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.

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Hi there .. i have a nad t752 amplifier , i have just got it back from the nad repair shop , they have just reinstalled it , but now the front right speaker is much softer than the left front speaker ,,...


I hate to say this but the repair was not complete. If the sound levels are different with the balance in the middle, then either they missed a problem in one of the pre-amp stages, or they used an incorrect substitution for transistors in one or more stages. This unit should be brought back to complete the repair.

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I have had the front, left and right channels go out over time. I have fixed all of them, and each time it has turned out to be a cold solder joint. While I love NAD and will continue to purchase there equipment, this generation is plagued with poor workmanship.

To fix the channel going out, I removed the top cover. Back cover and 2nd card from the left (looking at the receiver from the back side). This card handles all of the audio processing. I have found cold solder joints all over this board which has caused channels to suddenly go quite. I have never found a bad component. Also, I have cleaned the interconnect to be backplane (board that the audio processing board connects to) in the case of the center channel going quite.

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i would suspect a missing supply or speaker protect relay shorted? or staying closed too long. I'm not familiar with this model but a common failure is bad connections. Inspect all heat sinked parts and small value resisters used as fuses. Look for cracked solder joints on all parts, tighten pcb grounding screws. Memory is most likely powered by a high value cap or stack cap that maybe bad. Or the diode used to charge during usage maybe leaky , other part in ckt leaky, or the memory device itself is drawing excessive current off the memory cap. I have seen small 0.1uf disk caps turn into 1k resistors.

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It sounds like You have a Bad output Some where and its going in to protect mode disconnect spkrs and make sure volume is Down all the way and power up,Ck your wireing for Freyed wires and shorts at the inputs and outputs good Luck ttech

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