Question about NAD T743 Receiver

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Intermittent Volume Control

Suddenly, my volume control knob has become intermittent.  When I rotate the knob, the volume may change or may not change or may move in the opposite direction from my intention.  The volume control on the remote control works well.  I bought the schematic and assume that I need to change the M201 Rotary Encoder NAD part # 35-6001219-00-08.  They list it as a "ENCODER ROTARY L=20mm VER W/O CLICK". I was hoping that the schematic would give me a commercial part number so I could purchase the encoder before pulling apart the receiver.  Any idea what commercial part I can purchase to replace this component?  Is my assumption that the rotary encoder needs replacing a reasonable one?  Thank you very much.

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  • gwozdz Oct 29, 2008

    The posted solution was for generic "rotary knobs" and most were high power potentiometers. I need a very specific rotary encoder part number that matches the NAD part # 35-6001219-00-08. When I look in my Mouser Electronics catalog, they have 3 pages of rotary encoders but I don't know which one is the correct one if any are.

  • gwozdz Oct 29, 2008

    The second solution offered also did not provide me with any specific information. I still don't know what to order.

  • gwozdz Oct 29, 2008

    I have not resoldered the connections because it is such a chore taking the system apart. The receiver is sitting on the bottom of the stack of components and must have 20 cables running into it. I was hoping to have a new rotary encoder in hand when I take it apart so that I only have to do it once and my system will only be down for one day instead of two weeks looking for the correct part at that time. If I cannot find the correct component then I will consider your solution since it does make sense. Thank you.

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6 Answers

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What you need is a rotary encoder L=20mm W/O ECB16

I did not find the part for sale.

Try first contacting NAD and see if they distribute the part.

If not have it remanufactured with same specs (click here).

Posted on Nov 02, 2008

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  • Master
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The rotary encoder listed in the schematic is the only one you can use to replace the original. There are no generic types for your unit. It is the cause of your problem. When they go bad, they do the exact things you have described. I used to work at an authorized NAD service center and have never found any generic types of rotary encoders. You need that exact one so that it fits properly on the board. You can try cleaning it with a contact cleaner. It has been known to help in many occasions. Spray the contact cleaner into the encoder with the power off. Try to get it inside the encoder, they are sealed pretty good, but spraying it at all angles should get some cleaner inside of the encoder. Then just turn the encoder back and forth for a couple of minutes and see if it solves your problem.

Posted on Oct 29, 2008

  • Dave DeGain
    Dave DeGain Oct 29, 2008

    According to NAD, the only way to get the part you need would be to order it from an authorized NAD service center. You can go to this webpage for NAD http://nadelectronics.com/parts-service or just call this number to find the closest NAD service center near you 1.800.263.4641



    NAD parts are not sold to anybody but authorized service centers.

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The best people to call in this regard would be the manufacturers themselves. They may have the required spare pare or will specify what generic model can be used instead.

Posted on Oct 29, 2008

  • Swilin Sampson
    Swilin Sampson Oct 29, 2008

    Here is another suggestion. If you can actually remove the present rotary encoder and take it to an electronics shop, they should be able to find the correct replacement based on size and specifications. That way you do not need to keep it disassembled for a week or two..you could get it fixed the same day :)

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Just for argument's sake, have you tried resoldering the connections on the current rotary encoder?

Posted on Oct 29, 2008

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Yes ofcourse u need to replace it witha new one.. there r many rotary encoders available.. for more details bout it chek out.. http://posital.de/us/products/POSITAL/AbsoluteEncoders/AbsoluteEncoders_base.html?gclid=CLyWzrfey5YCFRX5egodzFGrzQ

Posted on Oct 29, 2008

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