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    #1

    Tripping Sansui

    Sansui Model SV 2918.
    Works fine for a while.
    Then goes on tripping and auto tuning, impossible to stop with remote or locals.
    Customer doesn't want to spend a lot.
    I replaced caps in power supply, to no avail.
    I suspect the M/processor.
    Must I give up?
    Tags: None
    #2
    Re: Tripping Sansui

    Originally posted by burntfingers View Post
    Sansui Model SV 2918.
    Works fine for a while.
    Then goes on tripping and auto tuning, impossible to stop with remote or locals.
    Customer doesn't want to spend a lot.
    I replaced caps in power supply, to no avail.
    I suspect the M/processor.
    Must I give up?
    Service manual.

    I'd check the voltage regulators on the main board.

    PlainBill
    For a number of reasons, both health and personal, I will no longer be active on this board. Any PMs asking for assistance will be ignored.

    Never be afraid to try something new. Remember, amateurs built the ark. Professionals built the Titanic.

    Comment

      #3
      Re: Tripping Sansui

      Thanks for the diagram. Appreciated.
      Set goes erratic; works fine for sometime, but suddenly starts tripping and then stops but keeps repeating auto tuning through the three bands, impossible to stop until switched off.
      I checked for dry joints carefully. None found.
      No caps looking bad or too hot.
      Power supply is a simple one.
      The customer told me the set had this problem some six months ago, and has been working fine for all that time until now.
      I don't want to spend much time with such nasty intermittent faults.
      It could be a stock fault on this model, do you think?

      Comment

        #4
        Re: Tripping Sansui

        Originally posted by burntfingers View Post
        Thanks for the diagram. Appreciated.
        Set goes erratic; works fine for sometime, but suddenly starts tripping and then stops but keeps repeating auto tuning through the three bands, impossible to stop until switched off.
        I checked for dry joints carefully. None found.
        No caps looking bad or too hot.
        Power supply is a simple one.
        The customer told me the set had this problem some six months ago, and has been working fine for all that time until now.
        I don't want to spend much time with such nasty intermittent faults.
        It could be a stock fault on this model, do you think?
        This REALLY sounds like a bad solder joint somewhere; a common problem with lead-free solder.

        PlainBill
        For a number of reasons, both health and personal, I will no longer be active on this board. Any PMs asking for assistance will be ignored.

        Never be afraid to try something new. Remember, amateurs built the ark. Professionals built the Titanic.

        Comment

          #5
          Re: Tripping Sansui

          Maybe.
          I will check it once again, but shaking the PCB causes no interference or any alteration - I've tried that trick already a couple of times.
          I was going to waste a full can of quick freeze on some areas, but I decided not.
          Since the customer is not keen on repairing it - no money - I will not spend much more time on it.
          But I get very frustrated no to be able to find the culprit!

          Comment

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