Patches and discussion for Ensoniq VFX family

If after resoldering the connections, You still get the error, try unscrewing the whole keyboard. On the underside there is a circuit board for the keyboard. It has some connections with some wirepins, which can oxidize. Unscrew that board, clean the pins and also push the EPROM (chip with paperlabel) into it's socket. Also remember to clean the ribbon cable connections from the keyboard to the motherbord.
If all this >does not< help, You are in for a repair at a shop.
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I re-soldered all of the connections on the hard wired ribbon cables going between the two side by side boards under the keyboard.  I tried cleaning the connector on the center board, then resorted to soldering it on.  I pulled, cleaned, and replaced all the socketed chips on the center board.

I had a new ribbon cable made that goes between the center board and the motherboard.  I cleaned both sets of pin headers, for that cable, as well as most of the cable and pin connectors around the entire instrument.  I removed all the keys and dusted/wiped the surface below the keys as well as all the metal pads under the keys.

I'm using Deoxit as the cleaner for electronic connections.

So far, it behaves exactly the same.  Unfortunately, there is no shop in my region that will service synthesizers, and the cost of shipping this out for repair is more than it would cost to replace it.  I can get the keyboard to calibrate by power cycling it several times, but I'm sure this will eventually fry something important.

Thanks again!