It's taken five years, but I finally get to join the Knights of the Lightning Wheel! I can't wait to tear into this.

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Does anyone have this plastic they'd be willing to part with? Mine appears to be missing. It's the 'future' version of the tiny castle plastic that sits under the drawbridge ramp.

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Slowly bringing my BK2k back to life and I'm working on sound now. I can get music to play in the diagnostics mode just fine and most of the sounds play (4 and 5 are missing). My question is about the sound test you can run by pressing SW-1 on the board. What's the expected result from that? When I press the button on my board the 'angel chorus' 'Ahhhhhh' sound plays and repeats over and over again. The manual states that I should hear two sounds and in my research on pinside it sounds like I should be hearing a high and low tone.

Hello again, @pinballmaniac40! You helped me in my other thread so maybe I should move this question to it's own thread. Let me know if I should do that.

Anyhow, in my "It won't boot" thread I believe you pointed out some corrosion issues on my CPU board so that could very well be my issue. Here's what I've done so far in regards to sound:

- I verified the U21, U22 ROMs on the CPU board and the U4 and U19 ROMs on the audio board. U4 and U21 didn't check out so I reburned those. That actually ended up fixing my boot up tone not occurring and some other sound issues.

- Recapped the audio board with all new electrolytics.

- Had to buy new audio cables (ribbon, and the 4-pin that connects the CPU to the Audio board) as mine were missing. I verified that the ribbon cable isn't offset when installed.

- Music test in diagnostics, all music selections work ( prior to recapping and new rom, this was silent ) and sound great.

- Sound test in diagnostics, all sound selections work except for 4 and 5 so that's another problem. Increasing volume to max for 4 and 5 I still don't hear anything in those slots.

- As I mentioned, pressing SW-1 on the CPU after getting the one 'bong' on startup, it just plays the 'angel chorus' sound over and over until I turn off the machine. It's quite pleasant, but I don't know if it's the "correct" action.

My plan was to download the audio test rom from pinwiki and start tracing out the address lines in the audio section in order to figure out the missing 4 and 5 sounds, but I wanted to just quickly check in the forum exactly the sounds I should expect when hitting the SW-1 switch. As far as the missing sounds go, I suspect it's possible my U9 is acting weird or as I've seen in other pinsider threads the CVSD could be an issue or something I'm unaware of. I also haven't replaced the c15 and c18 electrolytic caps on the CPU board yet; that's also on my list.

I've attached the pictures of my board from that previous thread so some things are outdated on it, including the removal of the battery holder and adding NVRAM from pinitech. Let me know if I should take some updated photos.

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Well I replaced the caps at C8 and C15 with no change. Reseated the ROM at U21 and got the missing sounds! Next time I have the board out I’ll replace that socket to really nip that problem in the bud.

As far as the sw1 button goes, I’m still not sure what’s happening. All the sound seems fine but pressing that button just plays the ‘angel chorus’ sound still. I’ll poke around some more. Now I have to figure out my drawbridge problem!

Thank you so much for checking your switch response! I’m glad to know that’s working.

Ha. Yes they were swapped. That’s an old picture and I should have updated it, but they are now in the right place. I did end up having to re-burn U21 because it was not verifying in my programmer.

Speaking of the sound issue, it’s back! But it’s weird. If I turn on the game after having sat for a while the sounds 04 and 05 in the diagnostics are missing. After the game warms up for about 10-15 minutes the sounds return and all is well. I replaced the socket at U22 I’m wondering if I need to do U21 as well? I’m guessing somewhere a piece of metal or solder is expanding with heat and making correct contact but I’m not sure where.

Did you check the wiring on the lower right flipper coil? Possibly a power wire or control wire came off. I wouldn't suspect a fuse as then both flippers would be dead.

Ha, wild! I've never seen that happen either. Glad you got it sorted.