Technics SA-TX50, overload problem

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  • suiramix
    Senior Member
    • Mar 2011
    • 131
    • Canada
    #1

    Technics SA-TX50, overload problem

    Technics SA-TX50 receiver is in decent condition , without any visible components damaged and fuses are ok... with no speakers attached, power on (with one relay click) and display the source input for few seconds and immediately show "overload" error message !!! The volume knob is at min. level.
    As per service manual (pag.27) the fan motor can be bad ...removed and cleaned the contacts, measured the resistance (24.1 ohm), put it back...same error message!
    Question: anyone had similar issue with this Technics model ??? can be the main power IC bad (or just cold solder joints)...
    Thanks in advance!
    Tags: None
    • madan1
      Badcaps Veteran
      • Nov 2016
      • 665
      • Bulgaria
      #2
      Re: Technics SA-TX50, overload problem

      see if the speaker terminals are shorted.
      Check the board connections.
      Then go to page 37 from the service manual and check if all the V regulators are working fine.
      Find the RSNxxxx datasheets and check if they are ok.
      Last edited by madan1; 02-26-2017, 11:35 PM.

        Comment

        • suiramix
          Senior Member
          • Mar 2011
          • 131
          • Canada
          #3
          Re: Technics SA-TX50, overload problem

          Thanks for reply madan1...I will check the voltage regulators...anyway, I cannot find how to perform a reset/initialize of the microprocessor (usually a combination of 3 buttons)...just unplug the unit for 30 min does not help !!!

            Comment

            • suiramix
              Senior Member
              • Mar 2011
              • 131
              • Canada
              #4
              Re: Technics SA-TX50, overload problem

              Just a quick update...searching for any faulty components, I did remove the front panel assembly and discovered the connector (C809) has a pin misaligned ...bend back to original position and ...voila ...back to life !!!
              Attached Files

                Comment

                • budm
                  Badcaps Legend
                  • Feb 2010
                  • 40746
                  • USA
                  #5
                  Re: Technics SA-TX50, overload problem

                  Good find.
                  I would also resolder all those pins of the connector too, they will develop cracked rings around the pins and cause intermittent problems.
                  Never stop learning
                  Basic LCD TV and Monitor troubleshooting guides.
                  http://www.badcaps.net/forum/showthr...956#post305956

                  Voltage Regulator (LDO) testing:
                  http://www.badcaps.net/forum/showthr...999#post300999

                  Inverter testing using old CFL:
                  http://www.badcaps.net/forum/showthr...er+testing+cfl

                  Tear down pictures : Hit the ">" Show Albums and stories" on the left side
                  http://s807.photobucket.com/user/budm/library/

                  TV Factory reset codes listing:
                  http://www.badcaps.net/forum/showthread.php?t=24809

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