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NAD 2400 turn on delay

Discussion in 'DIY' started by bill114, Feb 10, 2018.

  1. bill114

    bill114 AK Subscriber Subscriber

    Messages:
    284
    Location:
    Seminole, FL
    the amp works well but when powering up, the delay before the relay kicks on is only about 1 second as opposed to other my other amp (a NAD 2600A) which takes about 3 seconds. My question is, what determines this timing? Is it supplied by IC 803? Here's a screen shot of the protection circuit.

    Screen Shot 2018-02-10 at 10.51.36 AM.png
     

     

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  2. mbz

    mbz Super Member

    Messages:
    2,269
    Location:
    Melbourne, Victoria
    IC803, uPC1237H, extract of datasheet below.
    Likely that C819 has drifted out of spec 22uf/10V
    and should be replaced. Lengthen the delay by
    increasing the uf. Also check R813 but it will be ok.
    NAD2400.JPG
     
    redk9258 likes this.
  3. bill114

    bill114 AK Subscriber Subscriber

    Messages:
    284
    Location:
    Seminole, FL
    thanks!
     

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