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Change diodes in a NAD C326BEE audio amplifier

Discussion in 'Programming/Internet' started by Kami, Sep 16, 2020.

  1. Kami

    Kami Guest

    After reading this question, I have additional questions:

    I have a NAD CEE326BEE amplifier which is +10 year old. Since 1 week, when I try to switch it on, there is a click and nothing else happens.

    According to what I've found in different sources, this might be related to the protection circuit which is switching it off at startup.

    I've inspected the board visually and I have found 3 diodes which were not soldered properly, it looks like they are producing heat which has damaged theirs soldering points:

    [​IMG]

    According to the electronic shema these are the following:

    [​IMG]

    The diodes described in the NAD C326BEE Service Manual are the following:

    • Diode 1N4007 DO-41 1A/1000V (RoHS) D136
    • DIODE ZENER 5.1V 3W 5% DO-41 1N5918B (RoHS) D134 / D135

    I'm not able to find replacement components which the exact same specifications.

    Questions:

    • What would be a good replacements (I've read that higher wattage Zeners could be a good fit?)
    • What could be improved to prevent future overheating?

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