It's been a long time since I worked on my White Water and I'm bringing it back from 10 years of just sitting there.
I am trying to diagnose a switch matrix issue. Columns 1,5,6,7,8 all work fine, but columns 2,3,4 are all dead.
I am diagnosing this with the machine on and running a single jumper from j206 to j208 so it's not a playfield side issue.
I have replaced U20 and U14 with sockets and new chips, but not a single change in behaviour.
What are the next steps in diagnosis?
Much appreciated, it would be great to play WW again.