Did you use the ROMs from the original CPU in the Kohout or different ROMs?

viperrwk

Assuming you've tried both driver boards on the new CPU and have tested the switch matrix with the harness disconnected, and changed the IDC connectors for the switch matrix, eliminating anything wrong in the backbox, I'd look for a problem in the switch wiring on the playfield. Many times people rewire something the wrong way and all h***breaks loose - all with one improper connection.

Also, assume the ROMs are all correct - blue flipper and all. If you can, reburn a set and see what happens. This does seem a sticky problem.

viperrwk

You said when you loaded two balls it didn't recognize them but it did if you loaded three. What if you switched the switches around? Does it behave the same way? I wouldn't trust that just because a switch works in test it would work the same in game.

viperrwk

Cool! You should post this over on RGP as well.

viperrwk

Nice job fixing a very obscure problem!
Way to go Sherlock

Thanks for posting this.

i don't have this machine, but people new to pinball might think that the manuals are absolutely correct.

This is just not the case (for many older games); and it's good that this be pointed out.

Robert

Sorry I didn't see this post earlier.....That's a fairly known problem with the BK manual...It's been discussed on RGP numerous times. EG:

http://rgparchive-removed.com/rgpforum/showthread.php?t=364051

Searches aren't always going to turn up answers like this because the last thing you're going to assume is that the manual is wrong. Even people like Korn in his thread over there and Rob Anthony in this thread - http://rgparchive-removed.com/rgpforum/showthread.php?t=393858&highlight=black+knight+trough+switch&page=2 - didn't mention this at all. (BTW I respect both those guys immensely and this is not a slight to them in any way - they both know more than I could ever hope to but no one can know or remember everything.)

The reality is that there should be a place to document known manual errata on IPDB so people like catboxer don't go crazy. Would make all of our lives easier.

viperrwk

Agreed....Since helping people out on Pinside the past year, i've identified 3 gross errors in various Bally/WMS manuals that had us scratching our heads. Actually, EVERY manual for 80's era Bally's PSU's are wrong on the High Voltage Diode/Bridge orientation. Based on the manual and the actual configuration on the board, two of the diodes are swapped.

Yes, and it's not just Bally, Williams in their hayday, it seems like they just copied parts of the previous manual (unchanged from previous game) and stuck it into the next manual. So if there was an error there it's in the next one too.

So the errors are everywhere.

Robert

Ive got the same issue, the balls stay locked in the top lock at times and do not get ejected, however all switch tests come up as working. What exactly was the fix? to swap the switch wires from 17, 18 and 19?

thanks in advance

I re-read the above posts and it looks like you just need to switch the non-common wires for 17 and 19, leave 18 alone. So, switch that one wire on both switches. <------>

Then in switch test, from left to right, confirm in switch test it registers as 19-18-17.