Question about NAD T753 Receiver

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My NAD T753 goes into protection mode as soon as I turn it on.

I think it has something to do with the power supply, how can I fix this myself?

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  • quichot Feb 06, 2009

    I have the same problem with my nad3100 receiver

  • Anonymous Feb 23, 2009

    I have the same problem with my NAD T753. It started yesterday just as I turned it on. I have never before experienced any problems with my 3 year old T753.
    It seam to have something to do with the input, if I have nothing connected to an input I can start up the amp, but as soon as I change the input or turn the volume it goes into protection mode and a loud sound comes from the loudspeakers, I am afraid that it may have destroyed some of the speakers.
    When I turn on the amp I have one second or so to change settings before it goes into protection mode.

  • Anonymous Mar 03, 2009

    I have the same problem. My T753 worked fine for about 2 years. Problem appears during Receiver is working. Then you hear a crack from speakers and Protection mode gets acitve. Then you must plug off all input- and output-connections and then after same days receiver works fine again.
    The recevier has already been sent to an NAD-Support but the also couln't solve the problem permanent.
    Already checked cables (tried also with other) and also tested receiver with 'only 2 Frontspeaker' ('Stereo-mode') --> problem still appears from time to time.


  • gwgrind Apr 02, 2009

    Approx 10 mins on then 2-3 mins off. It usually rebooted and all peripherals came back on. The blue pwr on light stayed illuminated but all faceplate info was missing. Approx evry 5 shut downs, the display stayed on but I was unable to pwr down with button or remote. Had to unplug. orig unit was plugged into wall outlet. I then plugged into a monster HST 1600 unit; no help. This all happened yesterday and into the night. This am, first thing I did was turn it on. The rcvr has been on for over 45 minswith no pwr down. Me thinks it is a temp issue. I live in Phoenix, and it is possible the house temp (75 deg) caused an overheat switch off. perhaps an external fan might be the way to go. At this point I'm just guessing.

  • Anonymous Apr 14, 2009

    my t753 also goes into protection mode,just started doing this after 4 years lite use ok in stereo but bails out as soon as any movie dynamics are needed

  • Anonymous May 01, 2009

    My NAD T753 freezes after 10 minutes, then it needs to be still for 10 minutes, I can play for another 10 and so on. It costed a little to much for giving me this ****...

  • bill507 May 10, 2009

    exact same problem, and i made sure it's cool, with an external fan, and it still happens.  really annoying because it's brand new.

  • lifRepairman May 13, 2009

    I have the T733 with the samething. The ground Screws are loose, just open the unit and tighten up all the ground screws. Problem solved

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ALso do the same thing, but also cuts out my left rear speaker. This will make a dull hiss sound during use.

If I disconnect this speaker it works for a while.

It all started with my sub shorting out it's fuse, I had it repaired four times already and is costing me more than the system. I changed all my speakers and is costing me another R 12 000-00, problm still the same.

P.S. I had my amp taken to the specialists too, but they couldn't find any fault. If i touch the side of the amp I can feel a tingling on my skin, like getting an electric shock.....

Can this also be a ground loop / earth problem?

De Villiers

Posted on Jun 01, 2010

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The unit grounding screws have come loose. All the ground screws should be tightened.

Posted on May 13, 2009

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That could indeed be the issue, but you must check your speakers, wiring, and also the oupt stages for problems. Maybe the prtection circuits are actually doing their job. lol

Hope that helps...

Geno

Apr 02, 2008 | Audio & Video Receivers

1 Answer

Hello I'm looking for a NAD T753 Service


Hi DERAIN Francois,


First of all, thank you for purchasing the service manual of NAD T753.

Please email me at mjsvillanueva23@yahoo.com I will send to you the copy. It is a PDF file format and can't be upload here.

Again, thank you so much!

Take care and have a great day!

Rating and feedback are highly appreciated.

mjsazon

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My nad t753 reciever went into protect mode. i switched it off and was able to get it back into standby mode. The receiver switches back on but no sound comes out of the monitors. I can even switch between...


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 'nekkid'. 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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Nad t753 av reciever, mains power off then back on think had power surge have i blown a fuse in system. amp turns on but then 2 sec later turns off . can i take the casing off to replace fuses?.... dan


Blown fuses don't self-heal. If power comes back there is no blown fuse.

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.

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Not sure what this cable is for but YOU should be able to follow it to the component at the other end and determine its fucntion.

Here's the manual. Page 12 shows the rear.

http://www.retrevo.com/s/NAD-T753-Receivers-review-manual/id/8043bh641/t/1-2/

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Geno

Mar 05, 2008 | NAD T753 Receiver

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