Hey all,

I am working on a different pin after being out of the game for a few years. Looking for some pointers on a Sega Harley-Davidson.

The game boots up, but the raising/lowering bike just runs constantly (assuming the limit switches aren’t working). None of the ball trough switches work so the game is constantly saying “4 balls missing.”

Once in a while I can finally get it to start a game, but when it starts, it will auto-launch a ball around the upper loop and promptly shoot sparks from the CPU board in the backbox out toward the player if the backglass is removed. I was able to replicate this issue twice (and I don’t really want to try it again). It appears to be originating around the connector “Switch Columns” which checks out since other switches are having issues. I have already replaced the CPU board so I am not sure where the issue could be. I do not see anything glaringly obvious like a staple caught behind the CPU board or anything like that. How can I test for this issue with a multimeter?

Thanks,
Derek

All,

I sent the boards out for testing & repair. Several transistors, a bridge rectifier, and a few capacitors were tested and replaced where needed. The sparking is gone, but the switch matrix issues persist.

The bike test was a good idea. The limit switches don’t work though... even if I actuate them manually.

In fact, in reviewing the switch matrix, I find that columns 2, 4, 5, (and maybe 6?) are not operational. The switch transistors were proactively replaced, so I know it is not them.

Any recommendations of what else to look for or some direction of where to poke around with the multimeter?

Thanks in advance!

Bump... Any thoughts anyone?