White Water
Williams, 1993You're currently viewing posts by Pinsider bobukcat.
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Quoted from offdutyninja1:nokoro Yes, didn't find any problems AND swapping connectors on the MPU board 'fixed' that column - though I as able to close all those switches when testing the MPU.
I'm a little confused by your responses, when testing the MPU with all the switch connectors removed where you able to use the diode test to close every switch correctly? If the answer is yes, the problem isn't the board and has to be somewhere on the playfield.
Quoted from offdutyninja1:bobukcat the reality is confusing as well. Let me try again.
1. Switch matrix was connected to J207 and j209.
2. Row 8 was fully out, and column two was partially out.
3. Performed the diode test between J207 and J209. All switches closed except for Row 8 (pin 9 on J209).
4. Performed the diode test between J207 and J208. Everything worked fine.
5. Plugged back into J207 and J208 - all problems solved.
So obviously the row problem was on the MPU.
And most likely something is loose between switch 24 and 25, and moving the play field led to that error (and subsequently fixed it).
So I guess my remaining question is about the likely cause of the pin 9 failing.
Was it most likely the previous battery damage?
Or could swapping switches have caused it?
Do you just have a cracked solder joint in J209 pin 8?
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Asheville, NC