DIGITREX CTF3271 PSU bsfp3220004ad

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  • selldoor
    Slow Learner
    • Dec 2010
    • 7870

    #21
    Re: DIGITREX CTF3271 PSU bsfp3220004ad

    Lots of voltage regulators to test?
    Here is the data sheet for the IC1 - Dont know how to test other than for voltage in.
    Can find anything on an EZ949 - can you check the number E2949 BZ949 B2949 ?
    Attached Files
    Please upload pictures using attachment function when ask for help on the repair
    http://www.badcaps.net/forum/showthread.php?t=39740

    Comment

    • is_it_a_bird
      Senior Member
      • Feb 2013
      • 59
      • United Kingdom

      #22
      Re: DIGITREX CTF3271 PSU bsfp3220004ad

      Ok thanks, those diodes all seem to check out ok on the reverse

      I am getting 14v on vcc of ic1 but nothing from anywhere else, shouldnt I be getting something from pin GD, gate driver, or will that be just a start up voltage to wake up the fets

      Comment

      • martyparish
        Badcaps Veteran
        • Dec 2012
        • 313
        • United States

        #23
        Re: DIGITREX CTF3271 PSU bsfp3220004ad

        Have you considered changing the caps? Those look like crapXcon...

        Comment

        • is_it_a_bird
          Senior Member
          • Feb 2013
          • 59
          • United Kingdom

          #24
          Re: DIGITREX CTF3271 PSU bsfp3220004ad

          Grrrr IPOS150's come back all is forgiven,

          Originally posted by martyparish
          Have you considered changing the caps? Those look like crapXcon...
          Spoke to a friend earlier who checked a database with a different model with the same board and it recommended replacing the 5 caps mentioned in an earlier post, did this along with all the other secondary caps and there is no change still exactly the same

          Comment

          • martyparish
            Badcaps Veteran
            • Dec 2012
            • 313
            • United States

            #25
            Re: DIGITREX CTF3271 PSU bsfp3220004ad

            ah my apologies, I missed that post I guess

            Comment

            • is_it_a_bird
              Senior Member
              • Feb 2013
              • 59
              • United Kingdom

              #26
              Re: DIGITREX CTF3271 PSU bsfp3220004ad

              Anyone give me anymore pointers on this as I have been sat here for another 2hours and still cant get the 12 or 24v to kick in

              Could I also ask why am I getting 4.5v on the 5v rails but the 5vsb is sat at 5.03 volts and is 4.5 little low?

              Really want to get this one sorted as I always seem to see this board with the same fault and no cure on the tinternet for it.

              Thanks again in advance

              Comment

              • selldoor
                Slow Learner
                • Dec 2010
                • 7870

                #27
                Re: DIGITREX CTF3271 PSU bsfp3220004ad

                Did you test the voltage regulators on the main board?

                Did you try pulling the ps pin to ground to see if its a pin low switch
                there have been a few posts recently with that oddity. I will try and look for one later. Having a disaster with my cookies here - cant get into ebay on
                my laptop and I use it all the time.
                Please upload pictures using attachment function when ask for help on the repair
                http://www.badcaps.net/forum/showthread.php?t=39740

                Comment

                • is_it_a_bird
                  Senior Member
                  • Feb 2013
                  • 59
                  • United Kingdom

                  #28
                  Re: DIGITREX CTF3271 PSU bsfp3220004ad

                  Originally posted by selldoor
                  Did you test the voltage regulators on the main board?
                  VR-EH16A or equivalant sot23-1117-33 which states a 1.2 v drop and that is exactly what they are all doing

                  Originally posted by selldoor
                  Did you try pulling the ps pin to ground to see if its a pin low switch
                  there have been a few posts recently with that oddity.
                  Can you just expand on this a little, do I just put ps to ground...sorry for sounding stupid

                  Comment

                  • is_it_a_bird
                    Senior Member
                    • Feb 2013
                    • 59
                    • United Kingdom

                    #29
                    Re: DIGITREX CTF3271 PSU bsfp3220004ad

                    Can anyone give me pointers on how to boot the PS as a stand alone to see if the 12 & 24v kick in or the main is at fault.

                    Thanks

                    Comment

                    • is_it_a_bird
                      Senior Member
                      • Feb 2013
                      • 59
                      • United Kingdom

                      #30
                      Re: DIGITREX CTF3271 PSU bsfp3220004ad

                      Managed to sort a supply by putting a 2.2k resistor between ps and 5v, still nothing, not a dicky bird

                      Where do I need to start looking now????

                      Comment

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