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Before I ask how to move the topic to the other section... Thank you for sending me in the right direction! You supplied the info for the 3 vdc that should be at the connector. There was a hairline crack on the etched circuit board between the 1/4" damper jack tip, and the resistor in series with ...

Thank you...I will trace back to find the 3v supply. Without the circuit schem I'm looking at a coil and 22k resistor on the board that appears to go to a buss...calling it quits on it for the day...will trace it back tomorrow to find and get back to you. Again, thanks.

FYI...with the trs plugged into the jack...shows that all 3 contacts are open between each other. In other words, there is no continuity between tip/ring, tip/sleeve, ring/sleeve. The previous jack was intermittent internally, not on the circuit board, and a new oem jack replaced that one.

The pedal is a Korg model 530000000317. I believe it is the oem that is sold with keyboard. This is a molded mono (tip/sleeve) plug. Per your queries: tip and sleeve (no ring, mono plug) Resistance tip and sleeve: Pedal up: open mid: 1.5 to 2.0 ohms down: 0.1 ohm Using a unterminated stereo plug ...

Hi. First time on forum. Happy holidays. I have a technical question on a Korg SP-250. Damper does not work. I have changed the oem jack which was loose on the circuit board. I have checked for continuity on Korg pedal/cable/plug. I have checked using a known good pedal as well. I am skilled at ...