Macross PCB No Audio & CMOS Error ***Error Solved***

Arcade Collecting > Restorations & repair

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yotsuya:
Oh, one other thing, and it’s minor, but check on it- make sure your power supply puts out -5v. Some power supplies don’t but some JAMMA boards need them for audio. I scored a Macross II board for cheap on eBay listed as audio not working this way.

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Mike A:
That is a good point.

I had a Super High Impact board that was missing a bunch of sounds, but not all of them.

My candy cab was not wired for -5V.

Hooked the -5V line up and I had full sound.

bobbyb13:
The symmetrical blank bars are one of the weirdest graphic failures I've seen.

What could cause something like that anyway?

Falken Hawke:
Thanks for all the help!

I'll be able to check -5 when I get home tonight. The audio amp I traced back to find no input signals from the Yamaha YM2203C so not sure it's the amp. Never confirmed where -5 went so if that's the issue, I'd be happy.

Still haven't looked at the display issue except for isolating it to the A01 ROM portion of the board. Onve I have audio again, I'll look further. Kimda want audio 1st since it is playable as it is.

Thanks again everyone!

Falken Hawke:
WOOT!!

So, not fixed but found HUGE help. Time Soldiers uses a YM2203C as well! Already confirmed stuck outputs so now will need to verify inputs and I/O paths to try and narrow down the issue.

Unfortunatey (or fortunately) I have a good -5V to the board. As I've determined the YM2203C isn't sending output to the amp, I'll start tracing from there.

So I guess, Time Soldiers help maybe? 🤣

---EDIT---

...or not... Looking at chip upside down🙄

Either way, known good comparison 😃

...and looking more like bad amp...

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