Skip to main content
August 9, 2019
Answered

Stereo amplifier fault

This is NOT a Sonos question; but I don't haunt other fora, and there may be some enthusiasts here that have an answer, hence I am seeing if I can get some advice here.
I have a NAD amp of 2012 make, that has an amber light when on standby. When the on button is pressed, it takes a few seconds for the amber to turn green, and for the amp to play. All this, in silence.
The fault I am seeing now is this: the light turns to green, and after a few seconds reverts to amber, with a very loud pop from the speakers. Obviously, the amp does not play then.
Also, sometimes, this does not happen; the amp performs the way it always has.
Questions therefore:
  1. What could be happening?
  2. What is the fix?
  3. Until the fix is in place, any risk in playing the amp, given that the speakers will pop for every failed attempt?
Thanks for any insights.
    This topic has been closed for further comments. You can use the search bar to find a similar topic, or create a new one by clicking Create Topic at the top of the page.
    Airgetlam
    AirgetlamAnswer
    August 9, 2019
    Not sure where you are, but it looks like they have a dealership with offices in Mumbai:

    Kripa Electronics
    G-52 Roopmangal Building, 16th Road and Main AvenueVithaldas Nagar, Santacruz West
    Mumbai, 400052
    +91 22 26051781
    keihifi.com
    Bruce

    14 replies

    chicks
    August 11, 2019
    Double post
    KumarAuthor
    August 11, 2019
    Head on over to HiFiEngine, sign up for a free account,
    Can you do this for me? It does not let me register, saying it is not available for my region. Since it is free anyway, I can't see any legal or moral obstacle:-).
    My amp is listed there with its service manual linked - C325BEE.
    If you are able to do this, I will send you my email address via PM, to email the manual file to.
    Thanks!
    chicks
    August 11, 2019
    B. IDLING CURRENT
    1. Level power on for a minimum of 5 minutes
    2. Connect a DC voltmeter toTP1 and TP2 ,adjust VR22 for 4mV reading on voltmeter. 3. Connect a DC voltmeter toTP3 and TP4 ,adjust VR12 for 4mV reading on voltmeter.
    C.ISC CIRCUIT ORIGINAL ADJUSTING
    Adjust the pot VR3 to make the DC voltage of the point of TP10 to the same as TP11



    KumarAuthor
    August 11, 2019
    I see that there are other places to download the service manual from, and I now have it with me; mulling over next steps for a bit now.