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RCA VR 618HF vcr SMPS

Discussion in 'Electronic Repair' started by Mac, Oct 13, 2004.

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  1. Mac

    Mac Guest

    I am trying to bring an RCA VR 618HF vcr back to life. When I plug it in,
    it shows absolutely no sign of life.
    The power supply fuse is not blown. There are no signs of smoke,
    overvoltage, and no circuit foil or components are burned.
    I tore it apart and removed the circuit board so I could access the bottom
    side of the smps. Checked ESR on
    all electrolytic caps, only one (C813) checked high. Replaced it, powered
    it up, same symptoms. Ohmmetered
    the switching transistor and it measures a short (out of circuit). It is a
    BUL26XI. I can't find an exact match
    in the NTE cross reference, but checking BUL26 crosses to an NTE 2333 - (has
    anyone used the NTE 2333
    to replace one of these?) I was reading through some of Sam Goldwasser's
    vcr troubleshooting and smps troubleshooting info, and decided I had better
    check some of the resistors in the
    circuit. Did that and there are two (I believe fusible) resistors that are
    open. Can anyone (who has a schematic)
    tell me the values for R817 and R818? They measure completely open and they
    have five bands on them so I am
    not sure how to read the value (which end to you start at?)

    Thanks for any help.

    Mac
     
  2. Jamie

    Jamie Guest

    the NTE2333 is a High voltage NPN
    450V Staturated and 1Kv break down.
    at 6A cont 15 surge.
    i would say that maybe case style would
    be the factor here.
    P.S.
    you may want to also check the
    driver transistors for this
    Switching Transitor.
     
  3. Rono

    Rono Guest

    The common failure is the 22uf np (non-polarized)
    50 volt capacitor in the power supply! Rono.
     
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