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Rectifier Board out of Power Supply

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    Rectifier Board out of Power Supply

    This is a rectifier board out of a power supply from a vintage 1970s jukebox.

    It is made out of unobtainium, as in extinct.
    F2 and F3 are blown.CR2 is shorted, ITT is all is says on CR2
    Q2 is a known weak point, but tests good, Q3 tests bad, Q1 tests bad
    CR11 reads current flow both directions
    CR5, 6, 7, and 8 have obviously been hot, flow current both directions. thinking I will replace them

    Both large axial caps test good but are gertting replaced anyway.
    Anyone have any experience with these or have any suggections?

    Work on TVs mostly but this was dropped in my lap.

    Thanks

    LJ
    Attached Files
    Last edited by ljintexas; 09-04-2023, 01:45 PM.

    #2
    Re: Rectifier Board out of Power Supply

    probably be as well to rebuild it all .

    Comment


      #3
      Re: Rectifier Board out of Power Supply

      CR2 is a 1N4749, 24v zener, Here this should help, see page 4
      Attached Files

      Comment


        #4
        Re: Rectifier Board out of Power Supply

        Agreed...time for a rebuild.

        Thanks

        LJ

        Comment


          #5
          Re: Rectifier Board out of Power Supply

          there's nothing on that that isnt still being made - even the connector is a current molex one.
          if they ever became needed, you could make new ones very cheaply using a chinese pcb company for the fiberglass.

          Comment


            #6
            Re: Rectifier Board out of Power Supply

            BTW with those molex connectors, are the pins the same for those connectors as floppy/hard drive connectors? Wondering if I can get away with getting the molex connectors without pins (I need a female 2x3 0.25" centers) and use the contacts from computer power supplies ...comes with wire attached!

            Comment


              #7
              Re: Rectifier Board out of Power Supply

              i dont know about stuff like retention barbs, but they will mate together.
              i'v used stripped floppy cables on them by taking the contacts out of the shell and just putting heatshrink over them

              Comment


                #8
                Re: Rectifier Board out of Power Supply

                It doesn't make sense, what is blown unless a gorilla was in trying to repair the jukebox.
                They might have put in really big fuses for a while, or messed up connectors?

                CR11 gets overloaded only if Q2 shorts.
                Q1 triac is for switching on the turntable motor. It's rated 6-10A...
                If F3 blows so does F4.
                All electrolytic and tantalum capacitors need to be replaced due to their age and uh they didn't have vents back then so they blow up nicely.

                Rockola 54875-A Rectifier Board repair
                Last edited by redwire; 09-06-2023, 06:06 PM.

                Comment


                  #9
                  Re: Rectifier Board out of Power Supply

                  Originally posted by stj View Post
                  i dont know about stuff like retention barbs, but they will mate together.
                  i'v used stripped floppy cables on them by taking the contacts out of the shell and just putting heatshrink over them
                  Thanks for the reminder, yes, I forgot to use the heatshrink to reduce accidental shorts. Alas it would be nice if the barbs match up, dealing with 6 pins is annoying, need to connect 4 of 6 (i.e. 360 possible combinations though really it's just 6 combinations due to the fact I know the top and bottom should be the same) and I hope it won't fall out while it's drawing 10 amps per contact ...

                  Comment


                    #10
                    Re: Rectifier Board out of Power Supply

                    Originally posted by redwire View Post
                    It doesn't make sense, what is blown unless a gorilla was in trying to repair the jukebox.
                    these boards can be damaged by faults downstream.
                    and yes, jukeboxes pinball etc are often bodged by gorilla's on site to avoid having to drag it to a van and take it to the workshop.

                    sometimes you have spare boards to swap out but usually not.

                    incidentally, you need to watch out for faulty led's in the old jukeboxes - sometimes they are used to drop voltage rather than indicate stuff.
                    dead led can cause computers to lock up or voltages to go out of spec.

                    Comment


                      #11
                      Re: Rectifier Board out of Power Supply

                      oh btw, the molex hard drive connector pins do not barb up on the grid pin molex...they are different. Phooey.

                      Comment


                        #12
                        Re: Rectifier Board out of Power Supply

                        Originally posted by eccerr0r View Post
                        BTW with those molex connectors, are the pins the same for those connectors as floppy/hard drive connectors? Wondering if I can get away with getting the molex connectors without pins (I need a female 2x3 0.25" centers) and use the contacts from computer power supplies ...comes with wire attached!
                        I do not see any reason why this should not work the only thing that I would be concerned about is getting the plastic plug housing to hot and the pins not staying placed where you want to use it in but even if this happens you should be able hold them in when soldering it to the circuit board
                        9 PC LCD Monitor
                        6 LCD Flat Screen TV
                        30 Desk Top Switching Power Supply
                        10 Battery Charger Switching Power Supply for Power Tool
                        6 18v Lithium Battery Power Boards for Tool Battery Packs
                        1 XBox 360 Switching Power Supply and M Board
                        25 Servo Drives 220/460 3 Phase
                        6 De-soldering Station Switching Power Supply 1 Power Supply
                        1 Dell Mother Board
                        15 Computer Power Supply
                        1 HP Printer Supply & Control Board * lighting finished it *


                        These two repairs where found with a ESR meter...> Temp at 50*F then at 90*F the ESR reading more than 10%

                        1 Over Head Crane Current Sensing Board ( VFD Failure Five Years Later )
                        2 Hem Saw Computer Stack Board

                        All of these had CAPs POOF
                        All of the mosfet that are taken out by bad caps

                        Comment

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