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Repairing power supply circuit in American Audio VMS4

Discussion in 'Troubleshooting and Repair' started by mrmaster, Oct 27, 2013.

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  1. mrmaster


    Oct 27, 2013
    Hey folks,

    my first post here - I hope I'm in the right place: So I am repairing a DJ Controller that I found online and I would need some help in determining which parts I should exchange and which replacement parts i should get. AS far as I can tell (from the pictures) I would want to replace the large capacitor, the burned through capacitor, the Diode (M4) and the small IC chip that says PCN on top. Now, I know - or at least I'm pretty sure - what components these are, but I would need some help in determining which exactly I should get. Obviously for the large capacitor I'm just gonna get one of the same type again, but with the small one I really can't tell what value I'd need. Also, I am unsure about that IC with the PCN label. What exactly should I be looking for there?


    Thank you very much, appreciate it!

  2. davenn

    davenn Moderator

    Sep 5, 2009
    Hi mrmaster

    welcome to the forums

    there's an error message coming up blanking out your pics saying file unavailable

  3. mrmaster


    Oct 27, 2013
    oh I'm sorry, here they are - this time I uploaded them directly...

    Attached Files:

  4. OLIVE2222


    Oct 2, 2011
    Hi mrmaster,

    The M4 are standard 1N4004 diodes in SMD package, easy to get
    THE PCN is certainly a voltage regulator but PCN marking also stand for Product Change Notification, a notice attached to many semiconductor's, who making the part identification via google harder. This kind of regulator have many cross reference, so if you measure what voltage is coming out on a working product or get the service manual it will be nice. Looks fixable at first, you also have to add a decoupling cap above the PCB burning hole, can be a thru hole version.


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