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Korg c25 has power to it. Power light comes on but keys produce no sound. Any ideas?

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Posted on Jan 02, 2017

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SOURCE: when I play the sound come out distorted, like it

The manual is at:http://www.korguksupport.co.uk/upload/X50_OpGuide_E1.pdf if you don't have one. Try saving everything you want to save first if you know how to do that. Then initialize the keyboard. Follow the instructions on page 111 carefully. It sounds like you created an undesirable effect and accidently assigned the Pitch Bend Lock function to the effect. This parameter is explained on page 41 under Pitch Wheel Mod Wheel. Hope this helps.

Posted on Aug 20, 2009

  • 5603 Answers

SOURCE: Korg Wavestation EX LCD Screen Info disappears!

This is characteristic of a poor contact someplace within the unit NEAR the connections for the display. It may also be a bad plated-thru-hole in the circuit board. This problem could also be on the display circuit board itself. They often have a complete microprocessor right on the display itself.

The vibration from the keys causes the connection to break, and the re-cycling of the power sends enough of a pulse to break down the oxide at the poor connection.

These can sometimes be found with freeze spray circuit cooler and often by applying gentle pressure at suspect points on the boards and looking for changes.

It for certain is a get out and get under repair involving taking out a lot of case screws and VERY careful handling of the cables within the unit.

Posted on Feb 26, 2010

  • 5603 Answers

SOURCE: KORG SP-250. Keyboard powers

There is probably a cable loose that connects the keyboard itself to the processor... OR the key contacts have been contaminated by spilled liquid. The keys are scanned as a matrix. The contacts will be a conductive rubber pressed against circuit board traces. Clean contact "pills" and the circuit traces with ONLY 99% isoprophyl alcohol.
This is NOT for the unskilled to attempt a DIY other than carefully opening and looking for a cable that has come loose.

Posted on Mar 22, 2011

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