Question about NAD 712

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NAD 7140 The unit powers up but even with the volume turned to the max position you here the music very faintly. All three fuses are ok. I hooked the speakers to both A & B ports but get the same results. Also does not matter if it is in the CD or Tuner position any ideas. Please Help.

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  • Wesley Hixson Oct 10, 2013

    I am having exactly the same problem with my NAD 7150. There used to be an audible "click" when the amp circuits came online, but now there is nothing.

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Amplifier is about shot, need to replace IC pack or transistors (whichever it has). Could, remotely, be the speaker lines are installed incorrectly?out of phase. + to +, - to - from amp to speakers. Some amps will protect themselves when this condition occurs till fixed.

Posted on Aug 02, 2007

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1 Answer

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Take care. First put the volume down complete. Then unplug the head phone and than try to raise the volume. Could be the headphone connector does not switch through correct. Could be the connections between the pre and power amp are not in place or not proper pushed in?
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You don't state which model the turntable is. Without this we are working blind. If the turntable has a built in amp then that will have failed. A blown fuse would shut down everything. If it has no built in amp and you have it connected to a separate amp, then you have either connected it to the wrong socket - it needs a phono socket - or if the amp doesn't have one you need a magnetic cartridge preamp.

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Assuming you're trying to power the monitors from this unit as well as the mains.....Confirm that the amp switch is in the middle position which splits the internal amps....one for main and one for monitors. Output A would power the monitors.... B would power the mains.

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Hi there I have a C340 that has similar problem, you must have bought this from ebay, lol.

Nad made a mistake on the C range, the pre - power link can be shorted out. if the pre is shorted out it takes out the pre amplifier stage, I have managed to get the right channel working, I will keep you informed what is the cause of the left channel. I have replaced the pre-amp IC and a couple of Jfets and transistors. Once I have repaired the Amp I could repaire yours if you like???

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Hi okapi6

Use a 3.5mm stereo jack to RCA connector lead.
370a7a3.jpg Connect this to the AUX input on the back of the 7140, and away you go. Get the lead as an accessory from just about any electronics hobby store.

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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.

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1 Answer

Would like to know year of manufacture for Nad 7140 stereo receiver


Hi - You can download the manual by clicking the link underlined in blue below:

Nad 7140

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Please take a moment to rate this solution & let us know if the information given was useful to you - Good Luck!

Informatica

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There are a couple of tests you can perform. I'd first recommend checking the shield ground. You'll need an ohm meter. The details can be found on the following page.

RCA shield ground test

You can also test the output with the multimeter. Set the multimeter to AC volts. If it's not an auto-ranging meter, set it to a voltage range of ~2v AC. Disconnect the RCA cables from the head unit. Touch one meter probe to the outer ring of the head unit's RCA jack. Touch the other probe to the metal contact in the center of the RCA jack. With the head unit near full volume and a clean signal source, you should read at least one volt on musical peaks. If you have a bass disc or a test tone disc (~60hz sine wave), use those.

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First,
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If the fuse holds, shut down and connect the speakers, leaving the volume controls down. Power up and see if your fuse holds. If you have hum, an output transistor is most likely shorted. If you have no noise, SLOWLY turn up the volume controls and listen for the hum. If all is quiet, turn down the volume controls and connect your input cables and turn the volume back up. Noise? check your cables!
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1 Answer

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