Quad QSA-30A will not go ready

I have a (new to me) Quad QSA-30A that I just got about a week ago. At first, I could get it to go ready most of the time, now it will never go ready. I have traced the ready button into the DPRAM board and the logic is OK all the way into one of the microcontrollers on the board. But, the conputer doesn't see that button being pressed on the I/O display page. Reset, stop and start do indicate button pressed there. Are there any other interlocks that would prevent ready from being recognized by the computer?

I really can't get any further work done on this machine without being able to go to ready condition.

Note that other than the feeder setup, this machine is very similar to Samsung CP30 and CP33.

Thanks,

Jon

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