Question about NAD T743 Receiver

2 Answers

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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A heat sink is just a finned heat-conducting device for radiating heat to the air which should be flowing freely through the unit's ventilation holes. It can't break in normal use. But it CAN get clogged with dust reducing its effectiveness.

Register and download the manual for free at retrevo.com

http://www.retrevo.com/support/NAD-T743-Receivers-manual/id/8043bh636/t/2/

Page 6

"Choose a location that is well ventilated (with at least several inches to both sides and behind), and that will provide a clear line of sight, within 25 feet/8 meters, between the receiver's front panel and your primary listening/viewing position-this will ensure reliable infrared remote control communications. The T 743 generates a modest amount of heat, but nothing that should trouble adjacent components. It is perfectly possible to stack the T 743 atop other components, but the reverse usually should be avoided. Nonetheless, it is generally preferable that the T 743 stand alone. It is especially important that sufficient ventilation be provided; if you are contemplating locating the T 743 within a cabinet or other furniture, consult your NAD audio/video specialist for advice on providing adequate airflow."

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Hi,
While working it stops and flashes red approximately 2 seconds interval

Causes
Protection circuit is activated depending on the temperature of the surroundings

Remedy
Switch off the power supply and power on after the temperature have reduced.


While working it stops and flashes red approximately 0.5 seconds interval

Causes
1.Using speakers having less impedance than the specified.
2.If speaker core wire touch each other Protection circuit is activated


Even applying power red flashes 0.5 seconds interval

Cause
Amplifier circuit has failed

Remedy
Switch off the power and contact denon service centre


Thank You

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