Question about Kurzweil SP4-7 76 Note Digital Stage Piano, Semi Weighted Keys, 128 Programs, 64 Split Polyphony, Split Layer, Setup Mode, 24 Bit DSP Technology, Black

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I have a Kurzweil Mark-Pro TWOi. It takes several minutes to turn on, and keeps resetting and clicking while booting up. My guess is a bad capacitor somewhere. I looked at the power board, and it looks and tests out fine.

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I don't know what you "tested" the power supply board with, but I would use an oscilloscope to look at the outputs to see if any of the regulators are drooping. Clicking is a broad term... if it is a relay, it PROBABLY is for speaker protection and senses balance of the power amps.
With a two minute delay, this is PROBABLY a thermal issue... Use freeze mist/circuit cooler to find suspicious parts.

Posted on Jan 02, 2011

  • Anonymous Jan 02, 2011

    I didn't post a very good description of the problem. The clicking sound is made out the speakers when the piano resets. It made the same sound when the piano turned on normally (but would only do it once instead of a dozen times). I'm fairly sure the problem is not related to the relay. There is a power amplifier on the amplifier circuit board that gets very hot while the piano is turning on, but after it is on and ready to go, cools down significantly.

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