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I'll be interested in an MVS one.

Good job there! So even after probing the Z80, the RAM was still suspected to be at fault? It goes to show... I need to repair a board which plays sound fine on boot but plays random SFX and music. I don't have the skills to probe the board so will change the Z80 for a Z80a.

I've got an A board behaving like this. I believe it's to do with the Q sound, perhaps it's not making a proper connection between A and B.

I think it is a compatibility issue. The A board I was having issues with, works totally fine a legit SF2CE.

So I've changed the resistors at R46 and R47, the sound still cuts out.

Dark soft multi works with new a board. Mercs works first go. 89626a-4 10mhz board.

Ok, so my genuine SF2CE stack has turned up. I’ve taken readings of R46 and R47 and it gives similar readings. Plugged known working B and C board into my CPS1.5 board - no sound issues. SF2CE works a charm. As far as I’m concerned, my A board got repaired with the capacitors. I will test the...

So it turns out after the recap, I get beefier sound, but the BGM still cuts out for me. On mercs, it’s always within 10 seconds. On other games it’s random. I’ve read on another forum that it could be the YM3012, z80 chip or the OKI or the sound crystal. So… someone mentioned on another...

I forgot to mention that all the q sound games worked without issue for me too.

It sounds the same behaviour, it was driving me mad! I even ordered an expensive genuine a board to test SF2CE but looks like it will be surplus when it arrives. If your board is an Ali board, which I reckon it is, recap the board and go from there. Test on your blast city. The crust most...

Hey, so I've recapped the board, and have it running stable at 4.9v. WOW, I'm hearing SFX I never did before. Thanks everyone who replied.

I Oh wow, this was what I was looking for. How much was the CPO?

I've got a really fussy cab. Dialed in 5.02v / 13.4v - no BGM Final Fight Lowered to 4.7v / 12.38v - I get BGM Final Fight. I've got caps coming Tuesday. Will know for sure then.

Can anyone tell me what the tolerance for voltage drop on Jamma cable should be? I'm reading 5v / 12.4 at the PSU, and 4.6v and 12.2v at the Jamma edge. Bad cable?

Yep I saw the kit, thanks! I’ve managed to get the behaviour a bit more consistent. The board kept resetting so measured the 12v line, and it read 11.8v, even though the digital meter on the 5v read bang on. Fortunately it’s a suzo psu so upped the voltage to 12.3v / 5.3v which seemed to solve...

That’s really helpful to know, I’ll take the cap values and recap.

It’s no good, still audio drop out. I cleaned and reflowed some areas. I get some luck flashing Final fight first, and then the game. I do believe I’ve got a dash board which is the recommended one, right? Is the audio amp original? I’m thinking maybe recap around the audio section?

It was all the gunk in the board, IPA and flux cleaner did the trick. The traces were good. Maybe someone else will find this useful.

Yeah they are bad, aren’t they? Will source a new board but for now… I’ll do some problem solving. Just cleaned up the corrosions, it looks to be just that. But will test the connections in a bit.

Just also want to ask; a board needs to be be populated to work, but if playing 1.5 eg C&D would the multi use the onboard q sound exclusively?