Hi-ya! (See what I did there?) I just picked up a Black Belt last night, a local Craigslist find, so I'm excited to join the club. It powers & boots but won't coin up, though the owner claimed he had it working via the keypad thing a while back. I haven't had a chance to do any troubleshooting yet, and probably won't for a few weeks (a few other projects to finish up), but hopefully you few fellow owners are still out there -- I'll be karate chopping your inboxes for help if I need it!

Thanks for this tip! I'll get back to you in a few weeks (once the higher priority stuff is out of the way) to let you know if it worked.

Okay, I had a few minutes to get this machine hooked up just now, and I was trying to set it up for free play and also try that Ram reset that you suggested, but both of these actions rewrite the use of the 5 button -- and it seems that none of the buttons in the middle two columns on the keyboard are responding. Here is a picture, am I missing a wire on the connector at R5 or something?

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Thanks. Tried this and got second column working, but still not the third. Will try a few more times.

For what it's worth, I did manage to go into bookkeeping and tell it there were 3 credits on it -- which DID allow me to start and play a game, yay! Someone said this game has ugh and oomph sounds? All I hear are ding-beeps.

Checked the wires on J3 and it looked like some were a little loose, so I pushed them back in a little. Now the third column registers -- except it thinks it's column 2!

That sounded like a short to me ... Sure enough, little solder flake jumping two pins under the connector. Got it out, all keyboard columns work now. Free Play set!

^ Great, thanks, I'll have a look at my next opportunity. Now that it's set up and I verified it's working, I'll be putting this game aside until I have time for clean up & maintenance.

Here's pics to show you what I've got. These are "before", as I haven't cleaned anything yet.

Bookkeeping says it have over 8 million games. Is that realistic?

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Woot, finally got my Black Belt put back together and working! Still has a few more minor gremlins (e.g., 7 & 9 lights in the bonus, plus one at the top of the playfield, that seem to have board-side pin problems) but these don't affect gameplay. I'll work through them, but in the meantime, hooray, I can finally play it! Seriously, I got it in November 2018 and tore it down December 2018 ... slowly worked through playfield cleanup, adding LEDs, assorted mechanical repairs, but then only got around to reassembly and functional troubleshooting these last few weeks. I'd gotten sidetracked with some simpler EM projects and life in general. So it took a year and a half, but here it is!