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Porta B (L100P) blows fuses

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    Porta B (L100P) blows fuses

    Hi everyone,

    I have a porta B (L100P depending on the country it was made) that just stopped working a week ago while i was recording it.

    I started making an increasing low frequency until it was at the volume of the notes i was playing. So i turned it off, let it cool off a little and then when i tried to start it again, i just vlew the fuses in my studio... two times.

    Does anyone know what i can do to troubleshoot this? I was recording it and it just stopped right in the middle and it seems to be absolutely impossible to find one in a studio over here in France... Not even a L100, even less with a line out (i have made the line out under the swell pedal mod).

    #2
    If the power supply section has never been serviced, I would start there replacing the electrolytic capacitors.
    Hammond BC (Factory 50 Hz) With TrekII Reverb, Perc and Preamp
    Leslie 147
    MK2 Farfisa Compact Duo/Binson Echorec 2 T7E
    MK1 Korg CX3/Neo Ventilator
    Yamaha KX88/Roland D550/Kurzweil K2000R/Korg M1R/Korg X3R

    Comment


      #3
      Bonsoir,

      Je résume : Le machin a produit une fréquence de plus en plus basse, puis le fusible à fumé.

      Cela ressemble au condensateur de démarrage du moteur qui a rendu l'âme. Comme celui qui est sur la photo jointe. C'est assez fréquent.
      Ca gonfle. Parfois il y a fumée blanche mais ça fait pas conclave car c'est très toxique.

      Il me semble que c'est un condensateur au PCB (pyralène) 1µ25 / 630V à ne pas remplacer par n'importe quoi.

      JP

      Comment


        #4
        Originally posted by Jyvoipabo View Post
        Bonsoir,

        Je résume : Le machin a produit une fréquence de plus en plus basse, puis le fusible à fumé.

        Cela ressemble au condensateur de démarrage du moteur qui a rendu l'âme. Comme celui qui est sur la photo jointe. C'est assez fréquent.
        Ca gonfle. Parfois il y a fumée blanche mais ça fait pas conclave car c'est très toxique.

        Il me semble que c'est un condensateur au PCB (pyralène) 1µ25 / 630V à ne pas remplacer par n'importe quoi.

        JP
        Merci beaucoup! Je vais tenter ça, est-ce que tu pourrais me dire déjà ou en trouver un, et surtout, à quel endroit il se situe dans la machine pour ne pas tout désosser pour rien
        Est-ce que j'ai moyen sans mettre l'orgue sous tension de tester si c'est bien lui qui est mort par exemple avec un ohm mètre?

        PS: je ne reçois pas de notification de réponse... du coup je n'avais pas vu ta réponse...

        Comment


          #5
          Originally posted by Drawbar Dave View Post
          If the power supply section has never been serviced, I would start there replacing the electrolytic capacitors.
          That might be a good idea, but i've heard that bad capacitors in there usually change the overall pitch of the organ, but i haven't see anything related to these that blows the fuses when you try to start it.
          #Jyvoipabo 's answer makes sense though, as i have seen multiple threads talking about this run capacitor giving similar problems.
          Now i just need to find a replacement one.

          Comment


            #6
            The capacitors 1.25μF 630V are very difficult to find.
            On the other hand we find everywhere 2.5μF 450V
            So called permanent motor starting capacitor.
            Just buy 2 and wire it in series with a paralell resistance of 220k / 2W on one of them for the discharge purpose.

            JP

            As in the attached pic, you can run a ground wire from the motor to the TW frame. This can reduce electrostatic noise.
            And not shown a plastic screen for safety.

            Comment


              #7
              Ok, thanks, it does seem easy enough! From your picture, i'm guessing the original cap is in the top compartiment. I'll check that tonight.

              Comment


                #8
                Originally posted by thysm00 View Post

                That might be a good idea, but i've heard that bad capacitors in there usually change the overall pitch of the organ, but i haven't see anything related to these that blows the fuses when you try to start it.
                .
                The power supply capacitors in the amplifier have nothing whatsoever to do with the pitch of the organ.
                Current organs: AV, BC, A-100
                Current Leslies: 22H, 142, 147, 760
                Organs in the past: L-100 (several), M-100 (x2), T-100, E-100, CV
                Other keyboards: Roland FP-4, Yamaha DX7, Yamaha TX81Z, Yamaha Motif ES Rack, Korg Krome, Novation Mininova

                Comment


                  #9
                  Celui la marcherais probablement comme il faut - https://www.mouser.ca/ProductDetail/Illinois-Capacitor-CDE/125MABA03KHS

                  Comment


                    #10
                    Originally posted by thysm00 View Post

                    That might be a good idea, but i've heard that bad capacitors in there usually change the overall pitch of the organ, but i haven't see anything related to these that blows the fuses when you try to start it.
                    #Jyvoipabo 's answer makes sense though, as i have seen multiple threads talking about this run capacitor giving similar problems.
                    Now i just need to find a replacement one.
                    Well, that did the trick!!!! I just removed the old one, put those two new 2.5uF capacitors in series with a 220k resistor in parallel on one of them as you advised and it just started spinning like before I can't believe how cheap (around 10€) and easy that was! Now i just need to find out what to do with these 9 remaining 220k resistors

                    Thanks a lot! I can get back to recording it!

                    Comment

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