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Crumar DP-30 schematics

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  • #1

    Crumar DP-30 schematics

    Currently found only one supplier who wants $25 for a digital download.

    If anyone has the Crumar DP-30 schematics or know where i can get them cheaper please let me know. -William
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  • #2
    You are not far from me.

    I MIGHT have a couple Crumar prints, I'll look, but no promises.

    What issues are you servicing?
    Education is what you're left with after you have forgotten what you have learned.

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    • #3
      Currently the filter sensitivity control is not doing anything to the sound. The Knob is fine, it sends a negative voltage to a PNP transistor that is attached to a CA3080 transconductance IC that i believe has something to do with a filter depending on how hard you hit the keys. One circuit board was a mess as all the 10uf caps leaked all over, so far i have replaced all of the electrolytics (minus the main power board) which brought this thing back to life. There are a few dead keys which i suspect are not the frequency divider chips, i will take care of that when i look at the key*-board.

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      • #4
        I emailed the company and asked for a lower price of $15, they agreed on it and stated the service manual is not of the greatest scan. So i will see when they send me the download link. *paypal

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        • #5
          Horrible scans indeed...

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