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Thread: Any Kurzweil Keyboard gurus?

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    Any Kurzweil Keyboard gurus?

    I have a sp4-7 that fails to power on correctly. When I opened it up I found a bad lm317 regulator and 470uf cap. Replaced those then checked my voltages. 10v returned along with 5.1v but -10v is around -.7 and the 15v rail is being pulled down to 12v. Replaced the opamps thinking those were pulling down the -10v rail. No dice. Not sure where to go from here. Suggestions?
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    0 Not allowed! Not allowed!
    Last edited by tdlunsfo; 01-12-2019 at 11:58 PM.

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