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Whelp. I fixed it! It was indeed the sound oscillator/crystal. I used a known working one from a donor board. Check out how rusted/corroded it was underneath: I also got those extender cables in and work great: Now I'm going to move on and start a thread on another CPS 1 PCB that has...

Ah, the sound clock crystal. Gotcha. Don't think I have that on hand. I need to order a few. Edit: Wondering if this is a suitable replacement or not: https://www.digikey.com/en/products/detail/ecs-inc/ECS-100AX-035/827253 Edit 2: Going to link this here too with a similar issue where...

Curious where that's located on the PCB?

I doubt it's the sound roms, although I could re-burn to test. Reason being: When I swap to a 100% known working A board with this game, zero issues. If I swap this faulty A board onto another CPS1 (converted SFII to Ghouls and Ghosts) I can re-produce these intermittent sound issues. This...

Also forgot to mention that I had a spare Yamaha DAC (YM3012) so I socketed and swapped another one in. Nothing changed. I then proceeded to the Z80 reset as I mentioned in the post above. Del

I need to give that a shot, but I'm pretty sure it's a digital issue. I tapped into the Z80 Sound CPU at the reset pin 26 and ground at 29. I soldered a wire on each pin. When I lost sound, I was able to jump the two wires together to send a reset to the Sound CPU and the sound came back. If...

Stays dead. Sometimes I hear pop instead of sound or a screech. But mostly silence. Power cycling restores it. Del

More progress. Replaced the Sound CPU Ram with a known working one. Thought I had it solved after running the game for an hour in attract mode and then playing for another 15 minutes. Left it in attract mode afterwards, and the issue is back. :-/ Tried replacing the HA13001 sound amp. Nope...

If you hit a brick wall, I do have a working Mercs PCB in my possession. Del

Whelp, replaced my sound CPU and no change. Going to try the sound CPU ram next, as I have a donor PCB I can grab it from. No harm done. I'm pretty adept at socketing iC chips. My symptoms from the start: Intermittent sound. SF II game will start up just fine and will randomly lose sound. At...

Great resource here! Was going to post something similar to the issue I am having but going to do more homework first! Del

Not quite sure what you are asking, but I'm guessing it's due to a ground loop which could cause interference in the sound or monitor signal. https://www.bapihvac.com/application_note/understanding-ground-loops-application-note/ Del

I didn't know you back then yet, DJ. LOL.

Wondering if you will be venturing into parts as well? We've had some vendors here go South when it comes to reliability. I myself am looking for the non-vs version of the Blast City innards and marquee. Mine came with the vs. configuration and I can't use normal marquee graphics. Del

Good to hear. Yeah, Peter (APAR store owner) is a good dude. Did he exchange it for you?

I get the weekly Supermarket specials in the mail. That's what he used in the video too. They are free to grab at your local grocery store too! Del

Lubricating bearings has been discussed in depth over at KLOV. Basically, you don't want to use thicker oils like 3 in 1 which will gunk it up. Go for something better like Liquid Bearings. But you must dissolve the old oil and gunk with Acetone (nail polish remover) first. Then apply the...

My PSA of the day: The Arcade Buffett has an 11-year-old video on how to properly package a chassis. This is the proper way to package a chassis. Period. And the newspaper is typically free. View: https://www.youtube.com/watch?v=w1PR8bTVwSA Live it. Learn it. Love it. This is the way...

Sent you a PM over on KLOV for the locks. :-) - Del