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  • Mystery repairs

    Well, I do know how to say "no" when I have to, but sometimes I am just a sucker.

    A young lady calls me up with some keyboard problem. WHat brand is it I ask. She says that is the problem, they don;t know. She then said the magic words. "I took it to the guy at XXXX Music across town and he didn;t know what it was." Well I can;t stand it, if he doesn't know what to do, I certainly can;t let myself say I don't either.

    I used to work at XXXX Music, and the owner's son who runs the place is a fucking nazi prick. I don;t want anything to do with that place. ANy chance to show them up is a treat for me. The guy? I never met their service guy, I wish him no ill. From what I hear he generally knows what he is doing. Sorry he works for a nazi. SO considering that store, it is death politics, but as to the guy, let's call it friendly professional competitive spirit. In fairness he refers repairs my way when his shop can't or won't take a job. And I never hold customers hostage, as much as I hate promoting that store, if it is the best place for some customer's needs, I send them there.

    But my story wanders...

    The young lady finds my store and lugs this 88-key weighted thing into the shop. Heavy clumsy thing, but she wrangled it onto my table. Girl is sturdier than she looks. Did you bring your power adaptor? "No, I figured you;d have one." SIlly me, of course I have the proper power adaptor for a product no one can identify. Fortunately it wants 12v positive center. GOt it covered.

    Plug it in, no display or function, but the speakers do pop a little at power down. SO the system is getting some power.

    And what indeed is it? I see an "OSP" logo and SP-40. Nice weighted keybed action. Very basic piano with a few other voices. ANd MIDI. OK, never heard of OSP. But a quick google of OSP SP-40 and there it is. A bit of research and I find OSP is apparently some sort of membership catalog merchandiser. OK, I am guessing this is some Fatar or other Italian keyboard with a house brand on it.

    FIlled in the work order and sent the lady on her way.

    Just on a whim, I looked up the OSP site and contact them. A note requesting schematics for this unit. Wasn't expecting anything, but email is cheap. Lo and behold, the next day I have an email from them with not one but two schematic sets, and a note that they had two versions over the product run, though the unit is now obsolete model status. No kidding, OSP was there for me. DOn't know who you are OSP, but thanks.

    Open the board and it is nothing unusual. A small CPU board and a small power/amplifier board. And in the end cap, a couple small boards for the jacks and such. And ultimately the problem was merely lost connections in the cabling. REseat all connections and the unit works. Pulled the boards anyway to check for cracked solder and such, but all OK. Wound up not needing the schematics, but now I have them.


    If the other shop had opened this up and looked, he would have made the repair just as easily. But I don;t know what it is and I don;t have the schematic was enough to stop him. And I was assuming I'd never hear back from the seller, and I was wrong too.

    So, can you waste a lot of time on stuff you should never have taken in in the first place? You bet. On the other hand, never assume. I got a quick $60 that XXXX Music will never see.
    Education is what you're left with after you have forgotten what you have learned.

  • #2
    Nice story.
    It seems I'm always getting these oddball things to fix from old keyboards to turntables!
    Usually they're relatively simple fixes like yours, basic troubleshooting 101.
    Every once in a while I'll get thrown for a loop, that's when I come crawling in here looking for guidance.

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    • #3
      Originally posted by Enzo View Post
      I used to work at XXXX Music, and the owner's son who runs the place is a fucking nazi prick. I don;t want anything to do with that place. ANy chance to show them up is a treat for me.
      Gee, Enzo, I get the distinct impression that you dislike this guy and the store.

      Might this be an "old" music store?

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      • #4
        I know where you are coming from Enzo, you to drewl.
        I just opened my shop 5 months ago for side work, at a friends request, to fix a few things he had. Now I have had over 40 units in and out the door.
        Just that darn Peavey BH400 is my "loop" right now.
        Everything from bad, cracked out solder connections to massive caught fire and burned kind of fixer uppers!
        Only 1 unit turned away for costing more to fix than it was worth. a DXF HDJ2000. The main transformers primary and secondarys are opened up and you can by a whole new unit for $180. The transformer overheated really bad.

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        • #5
          Hi Enzo.. The forum topic is several years old, however I am in a pickle and you are the old person who may be able to assist me..

          I have one of those OSP SP-40 88 key Digital pianos. The sustain connector broke. I I tried fixing it and made it worse... If possible could you share the circuit map with me? Some wires came loose and I thought I knew where everything went, however, now the instrument sustains all the time.

          I searched the internet and made contact with a company that said they used to sell the instrument, but it was discontinued over 10 years ago, and they couldn't help me..

          Thank you in advance for any help you are able to afford.

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          • #6
            Sorry, that was a couple computers ago, and have no idea where those schematics went.
            Education is what you're left with after you have forgotten what you have learned.

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            • #7
              If you tried to repair the sustain jack and now it sustains all the time it seems you may have something shorted. Remove your fix and see if it still sustains all the time..

              Also if you want to continue please start a new thread.

              nosaj
              soldering stuff that's broken, breaking stuff that works, Yeah!

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              • #8
                Yes, ^^^^^^^ that. It's a simple jack hooked to a switch. It should be easy to check without a schematic and with a DVM. Either it's shorted all the time or it isn't. Either it's open all the time or it isn't. FWIW: There are different configurations of sustain pedal circuits. Some sustain when the switch is open. Some sustain when the switch is closed. So, there could be two different scenarios. Either there is an open in the circuit and the switch isn't switching all the way to the circuit board. Or, there is a short at the jack/board and the switch doesn't matter. The point is to measure resistance at the the board/jack contacts and see if there is a change when the footswitch is depressed.
                "I took a photo of my ohm meter... It didn't help." Enzo 8/20/22

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                • #9
                  Not really clear if the connector in question was on the pedal or on the keyboard. In any case, like The Dude said, there are 2 configurations and it's easy to get them reversed. Some pedals even have both available from a three pin switch. Maybe 3 wires at the 1/4 inch plug end so it can be wired up either way. Or maybe it's a replacement sustain pedal with the opposite type configuration.
                  Need more info.
                  Originally posted by Enzo
                  I have a sign in my shop that says, "Never think up reasons not to check something."


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