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used Hammond XK-1c: Keys work, just not at same time.

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Bought a used XK-1c today. Tested keys while there and they're all working when playing chromatic scale. But got it home and several of the keys don't work while simultaneously playing the 2nd F from the top.


It behaves the same when XK-1c controls B-3X and Keyscape. But when I midi into XK-1c (w/ Arturia Keylab mkii) everything works fine. So I figure it's a mechanical issue. 


Any ideas about what could be wrong? It was a little dusty, think it's dirty contacts? 


Video demonstration attached. 

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Seller got a Mojo Crumar and XK-1c sat unused a good while. It's an uneducated guess, but maybe this keyboard needs a recapping. I'll try to contact Hammond tech support tomorrow. 


Really digging this keyboard otherwise! 

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Keys probably have a diode matrix that encodes them to be scanned. Keys interfering with other keys could possibly be a bad diode, or something conductive laying across 2 traces.


Give everything under the keys a good cleaning. Might try cleaning everything but the contact strips first - easier to get to.

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"I keep wanting to like it's sound, but every demo seems to demonstrate that it has the earth-shaking punch and peerless sonics of the Roland Gaia. " - Tusker


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