Arcade Collecting > Pinball

The Machine Bride of Pinbot repair thread

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saint:
I don't recall the display being out last time it was working (I know, duh), and the machine has been physically moved twice (a few feet each time, but still moved), so I'm hoping for a lost/broken connector.

newkillergenius:
Well Saint, I know it's been a while since you've posted in this thread, but what was the outcome of the repairs on your BOP?

sslakkerr:
Just wanted to say Thanks to you guys. Your info to saint got me on the right track to sort out some switch problems on BOP.

I lost a column of switches and I tracked it to the ULN2083 chip (that switch matrix in the manual is a great thing). I replaced the chip and the problem is fixed. If anyone does have to replace this chip, which apparently is known to fail, be warned that the solder rings on the board are extremely thin and will very easily poof into nothing. I had to run one jumper wire because of this.

I will be replacing two 39k resistors on the display board to hopefully resolve a weak lower display problem. I read that these tend to fail and cause problems with alphanumeric displays and it is a good first fix attempt. I'll post what comes of it.

Thanks again!

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