Ok cool sorry I should read my posts a bit more closely before pressing the submit button
Story so Far..
Basically I've got a Dead Wpc CPU/Mpu board out of a machine I'd recently purchased.
I substituted a known working Wpc CPU/Mpu board into that machine and the Pin works perfectly.
So in effect this proves that the fault is on the machines original Mpu board.
So I'm trying to find the problem on the original Mpu board
I've changed the buffering ICs at U1-2-3 without change.
I've sourced an ASIC chip that I've just installed and powered the board on The bench.
It seems to be toggling all the data on the J201 and J202 headers so going to try back in the machine shortly...
