Technics current drive problem on a vx800

Discussion in 'General Electronics Chat' started by mickmick, Jun 7, 2012.

  1. mickmick

    Thread Starter New Member

    Jun 7, 2012
    4
    0
    Hi!

    Got a friend that got a su-vx800 that not want to start in current drive stage, only the first amp comes on.

    It happends after playing pretty hard with it for a whole weekend :D


    Some tips,PLS:confused:

    I live pretty far from him and cannot search for the problem(mostly because for spareparts delivery time doe i only will visiting him for a day!) when i visiting him, therefore i "want some meat on my legs"(directly a swedish translation)before i can take a look att the amp!

    Manual:
    http://www.opweb.de/model.php?id=881


    Thanks in advanced
    Mike
     
    Last edited: Jun 7, 2012
  2. #12

    Expert

    Nov 30, 2010
    16,257
    6,762
    If you posted a schematic here, we could try to be helpful. Without a drawing, it is all guessing.

    I uploaded the drawing so ppl don't have to go to your link.
     
    Last edited: Jun 7, 2012
  3. mickmick

    Thread Starter New Member

    Jun 7, 2012
    4
    0
    Done, excuse me!

    Mike
     
  4. mickmick

    Thread Starter New Member

    Jun 7, 2012
    4
    0
    I know it will be pretty hard 2 find the faulty component without measuring. Im most curious if someone else had the same problem!

    Mike
     
  5. R!f@@

    AAC Fanatic!

    Apr 2, 2009
    8,749
    759
    Tell me a bit more.

    {ed}
    That model has transistors at the output stage. First U need to check for shorted power transistor for shorts.
    U can check for short without removing. U will need a good DMM.
    The meter needs to be in diode check range. Before testing, make sure the power is off and the filter caps are completely discharged !

    U need to make sure that none of the power transistors mounted on the heat sink does not have a short between CE.
     
    Last edited: Jun 7, 2012
  6. mickmick

    Thread Starter New Member

    Jun 7, 2012
    4
    0
    Okey, TNX!
    Where is the "connection" between output stage and the current drive stage?

    Is it the overload curciut?

    Mike
     
    Last edited: Jun 8, 2012
  7. R!f@@

    AAC Fanatic!

    Apr 2, 2009
    8,749
    759
    No...these are the Current amplifier and is the final stage of the Power amp.

    There will be I thing eight Power transistors mounted on to the heat sink. Big ones. If u miss these, u need glasses mate.
     
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