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Hammond M3 Troubleshooting

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  • Hammond M3 Troubleshooting



    It was February,I recognized it from a block away,teetering on what would have been the curb,except for the 3 foot snowbank. It couldn't have been out there very long,based on the cabinets condition. When I got it home,I had it standing on end on a furniture dolly and a little water drained from under the keys and tabs. </p>

    Its been two months of drying so I began to tinker. I replaced the 5U4 rectifier as the Fender tube that was in there had a gas leak indicated by the "white" inside the glass. The amplifier now plays,and the speaker functions, but I can not get any signal from the keys. The generator is running smooth and quiet as observed with its cover removed.</p>

    Any ideas would be welcome.</p>

    Thank You.</p>

  • #2
    Re: Hammond M3 Troubleshooting



    Divide and conquer!</P>


    Try injecting signal before and after the expression pedal as a start.</P>

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    • #3
      Re: Hammond M3 Troubleshooting



      Let's try these steps. </P>


      1.Make sureat least one drawbar is pulled out.Hold down down a key, and jiggle the drawbar to see if there is an intermittent tone. Try this with other drawbars as well. </P>


      2. Hold down a key with drawbars pulled. Flip the "Vibrato Manual" switch while holding down a key. If you hear a vibrato tone when on, and then nothing when off, a tube is bad. </P>


      3. Check each wire leading from the tone generator to the keys and the amplifier. Make sure none is disconnected. </P>


      4. Check to make sure each tube does not run super-hot. If it burns, it's NOT working (at least in the organ's case). </P>

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      • #4
        Re: Hammond M3 Troubleshooting



        Here we are almost 2 years later and I'm getting back to it my pneumonia clears up a bit more. Since this is at least two computers later I no longer have the photos I culled around the net,so let me add that when I found this organ the person/s who put it out found quite entetrtaining to cut out the rope of black wires to the pedals and generator,and all the wires to the preamp,leaving little stubs at both ends. At least they didn't rip them out,nice guys.</P>


        What I need is a clear picture or clear/concise diagram to re-make the patches. I think I can do the black wires by process of elimination,or trial and error with a continuity beeper on my dmm,but the preamp wires are a different story.</P>

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        • #5
          Re: Hammond M3 Troubleshooting

          The amp is stamped with the colors of the wires just above where the wire attaches to the terminal. All you have to do is match the colors to the other end where they were cut. There are a couple of duplicates you'll have to sort out, like green and black. There are plenty of diagrams and schematics on the internet. It's my guess some passerby "copper collectors" cut the wires to sell to the local scrap dealer.
          Hammonds: A; AB; B3; D; E; 6-M3's; 2-A100; T582C.
          Leslies: 3-31H; 21H, 22H, 4-44W; 46W; 25; 47; 45; 125; 50C; 51; 55C; 2-120; 122; 122A; 145; 147; 245; 770; 825; 2-102; 2-103; 300.
          Wicks 2/5 pipe organ; Yamaha upright; Kurzweil Micro Piano & Micro B with M-Audio Oxygen 61; Yamaha DGX520; Wurlitzer 4100 (it came with a Leslie!). Peavey KB100 keyboard amp. Peavey Bass Guitar. Yes, I have A. D. (acquisition disorder) and don't want it cured.

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          • #6
            Re: Hammond M3 Troubleshooting



            Ahh yes the copper collectors... but I really didn't think they would get enough to make it worth their while,but I believe you may be right on that point.As for the duplicate colors,I seem to remember more than a couple,but as I get to it through the weekend we shall see.</P>


            Thank You Admiral.</P>

            Comment

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