Hello, been on the site for awhile, but new to posting...

Just recently after I had everything working I went to play the next day and I noticed the outhole switch wasn't reading when the ball drained. A little bit more investigation showed that all switches on row 5 weren't working. These switches were all previously working. When the outhole wasn't reading I lifted up the playfield slightly and it read for a bit and kicked the ball over. Right now it seems I can't get it to work at all anymore.

I checked the voltage at the pin coming off the board (J208-5)and I have voltage at the pin. I can check the voltage at the switches and they seem to show voltage there too. I'm pretty stumped as to why they aren't reading but it seems I have voltage.

Any suggestions would be much appreciated.

Thanks,

Mike

So I've got the wire color (white-green). I can trace the wire all the way from the J208-5 connection to the final switch ... I don't see any broken wires or loose connections. I did also check continuity from the J208-5 connection point on the connector to the left lane rollover and got a beep. Then checked from there to the outhole connection and also got a beep. I would figure if I had a broken wire, I wouldn't show continuity between the connector and the switches.

I went back to test switches and still none of the switches register. Any more thoughts on things to check? I'm still quite stumped.

I did a continuity check between the bowl switch and the diode lead on the board behind the dmd with the switch connected and I got a beep. So it seems that it is definitely connected. And I am comfortable taking measurements, just not sure what else to check.

If its a problem with the board, I wouldn't have expected for it to be intermittent when I moved the playfield before. But I have also removed the board two times now to check it out and I don't see anything too obvious, but am also not entirely sure what to look at if I'm showing voltage at the pin and and continuity to the switches.

- I appreciate the input thus far though.

I wanna say thanks for the feedback, I appreciate the help and any thoughts that anyone gave.
Yesterday I did some extra tests to verify it was the board. I jumped the column switch directly to each row switch and everything worked properly except row 5 switches. So I took the CPU board back out to do some further investigation.

Using my MM I did continuity checks starting at the diode and moving backwards based on the schematic. Diode 7 and cap 7 were good with R 60 and 59. Resistors both read correctly as well. R59 showed good to leg 11 on U19. Using the other rows I was able to determine which legs on U19 were which numbers. Then checking leg 13 to R31 gave me nothing! Bingo. This resistor also had a little acid damage from the batteries. Which I cleaned up twice. So while I had it out, I reflowed the solder on the point, still no continuity. Reflowed the solder on U19 - 13, still no continuity. Tried to add solder to the resistor, still nothing.

So just to test, I soldered a jumper between the resistor leg and U19-13. Continuity - yes (no surprise though). Re-installed the board, and everything has been working perfectly. All switches are registering perfectly. I've put a few games on it and everything is still good.

Conclusion, it has to be acid damage breaking the connection in the board at the resistor. I'm being a little lazy and just trying to enjoy a few games with it working 100% before I go back in to pull the board back out. It looks like I will have to pull the resistor off the board and clean out all the solder to make sure it's good.

I just wanted to leave my conclusion in case anyone else has a similar issue.

Thanks again