Question about NAD T743 Receiver
My NAD T743 is overheating on startup. This started after I left it unplugged for a day and a half. I have tried the reset procedure of "Video 6" and "source up" button. I have tried starting from the auxillary power button in the rear. But the unit goes to "over heat" as soon as it warms up. What to do?
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Posted on Jan 02, 2017
SOURCE: Power on T743
Just had my t753 in bits... sounds like its overheating to me. Check that the fans on the bottom still turn and aren't clogged up with dust. Make sure that it has plenty of ventilation.
hmm, also try unplugging everything and leaving it on and see if it still freezes? ie check you're cabling is ok, there are no shorts from bare speaker wires etc...
Could try resetting it too? (in each case hold the buttons for 5 seconds then release)
- Firmware version: hold video 6 and tone control
- Reset DSP: video6 + tone defeat
- Reset completely: video6 + right source button (this will wipe all settings - hold for 5 seconds, release and then unplug from the wall or turn off with the rear power switch)
Posted on Nov 30, 2008
SOURCE: turns itself off
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
SOURCE: NAD 7140
The clicking is the sound of a bad relay. A relay is an electrical switch that opens and closes under the control of another electrical circuit. There is no user solution for this. You'll have to take it to an electronics repair shop (~$150) or dump the whole unit.
Posted on Dec 19, 2008
SOURCE: My NAD T743 will not switch on
Hi, have you checked the power button in the back to see if it got pressed by accident? It's a round button located right under the speaker inputs in the back.
Posted on May 09, 2010
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Mar 06, 2011 | NAD T743 Receiver
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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