Fixing stuck inputs on MV-1C

I figure this would help people fix their MV-1C boards whose only problem is that a button(s) is permanently stuck on the ON position. The old way of fixing this is to just replace the entire YSA2 chip but that isn't exactly my idea of a good time.

With this method, all you need is a 74HCT245 or 74HCT244 to repair the input. Just lift the corresponding pin on the YSA2 that has the busted input and connect the pad to the input on the bus transceiver. The entirety of the chip doesn't need to be connected but at minimum, you'll need to get 5 wires if you only have one busted input (VCC, GND, /G, 1 input, 1 output).

Thanks a bundle for sharing! Little Caesar's forever!

For some reason i'm unable to see the attachment so not sure what you've done exactly. Have you bypassed the YSA2 chip? I have a board which has the opposite problem, the button signal reaches the YSA2 but it doesn't register on the chip itself.

Nice thanks for shareing.

Ah can see the drawing now.

So are you actually bypassing the YSA2 here and connecting the output of RC network directly to the 68k (via 74HCT245)?