I have an F14 that I am shopping out/repairing for a friend. The game has developed a switch matrix issue.
The game was working perfectly for days, I shut it off this evening to make dinner, come back an hour later power it on and this issue has surfaced.
Using the switch edge test, I have determined rows 1 thru 5 all register the switch in row 6.
Rows 6 7 8 all register correctly. See pic.
I disconnected the switch matrix connectors and used the jumper/diode test on the board and get the same results.
These early system 11 games are not my strong point. Ideas or suggestions what is failing?
I am comfortable with board work.