Question about NAD T743 Receiver

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Turns itself off

My T743 has started to turn itself off randomly from time to time. Any ideas what could cause this? The red power button is on but it is impossible to turn it back on without unplugging it.

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  • GoneNAD Oct 05, 2008

    I have exactly the same problem. Can anyone help?

  • ianp30 May 04, 2009

    I opened up the receiver, found D756 and verified that I have diode 1N4004, but my receiver still randomly powers off. The difference between when I power off and when it powers itself off is when it powers itself off the volume is almost turned way down. This problem is getting worse. Do you have any more advice?

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Mine got fixed, had to replace the front panel PCB card that includes the control processor: 350€...

Posted on May 03, 2010

  • Robert McComb Oct 12, 2011

    Agree with this solution - mine had the same symptoms and the equally costly fix.

  • Robert McComb Oct 12, 2011

    Agree with this solution - mine had the same symptoms and the equally costly fix.

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NAD Technical Bulletin T743-H2005-06 describes the problem "Unit may shut down, shortly after turn on".  Reason: There is a diode on the standby board that maybe operating intermittently.  Solution: Locate and identify D756 on the standby board.  Change only if the diode is a 1N4148.  Change from a 1N4148 to a 1N4004 or equivalent.  
It is located near a transformer and some fuses.

Posted on Oct 29, 2008

  • Richard Gilpin Jul 29, 2012

    I found the diode at D756. I could not tell what its number was. I pulled it out and replaced it with a 1N4004. The NAD would not then start up. I replaced the diode with another brand-new IN4004. Still nothing. The orange ready light on the front stays on, but the unit never turns on when I push the power button. But I think I have done something because the unit does not now report "overheat." I am not an electrician, but I am confident that I installed the 1N4004 properly. Any more suggestions? TIA

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