Sigma AV 6000 supergun no sync

[SamuelHan]

Hello people,

Hope you are all well during this difficult time, but as we, in France, are confined in our homes it’s time or some retro sensations !

But i’m facing a problem, i have no sync when i hook a sigma av6000 supergun to my OSSC, the led is green but i’m always on the grey screen. The supergun works well when it’s directly hooked on the scart plug of my TV (sony w705 series) and other consoles works on the OSSC. It’s also working with a Retroelectronik supergun.

What i’m using :
OSSC v1.6 firmware 0.85a
Supergun AV 6000 + retrogamingcables.uk scart cable
Final Fight CPS1 at 4.85 volt
Konami’s Astérix at 4.92 volt

Hope someone can help,

Have a nice day and stay safe !

[nmalinoski]

Is your supergun outputting 5V TTL sync? And, if so, does your cable attenuate that to consumer-grade 1V, 75Ohm?

[SamuelHan]

Hi,
Thanks for your quick answer, it’s seems that’s the case, as the supergun use a meanwell mwp-602 as psu and the retrogamingcables scart cable is “OSSC compatible” according to the product description.

[Harrumph]

The PSU has nothing to do with what voltage is on the sync line.
If you got the specific one from RGC then it should be to spec and just plug-and-play
https://www.retrogamingcables.co.uk/jamma-super-gun-arcade-cmvs/sigma-supergun-rgb-scart-cables/Sigma-av7000-rgb-scart-cable

You can try checking voltage with multimeter (gives average so not perfect but gets you an idea of the level) or even better if you have access to oscilloscope.

Easiest is probably to contact Robert at RGC, he can help you.

If you get ”no sync”, and it’s caused by too low sync level for some reason, you can also try adjusting sync threshold on OSSC.

[SamuelHan]

Yes, this the scart cable I use, ok I will try the sync threshold setting and let you know, thanks for your advice.

[SamuelHan]

So I’ve tried to mess with sync opt setting but there’s no change at all, what bothers me is that i find a lot of videos showing sigma superguns hooked to an ossc that works, plus the fact that even the “infamous” retroelectronik supergun works also, I know that my TV is not really “ossc friendly” but even with the neo geo i’ve got a message telling me that it doesn’t support this signal.

[SamuelHan]

Hello all,

A little update, a super cool guy from youtube made a test with the same setup as mine (except the tv but i’ve tried with a lg tv but that doesn’t work) and it’s working without any specific settings, so i’m really confused to be honest, here is the link to the video : https://www.youtube.com/watch?v=C2y8o_zyzGM&feature=youtu.be

Thanks in advance for your concerns and stay safe !

[BuckoA51]

Have you tried doing a settings reset just in case you changed something you forgot about?

[SamuelHan]

Hi Bucko, i wasn’t sure so i’ve just tried it and still no image, but i have sound.

[SamuelHan]

And to be sure i’ve just connect my old retroelectronik supergun and it works.

Edit : I’ve just reconnect the sigma and i have no sound again, maybe a problem with the scart cable ?

[SamuelHan]

Hi,

So i contacted Robert from RGC and he has no clues at all (but he only ask me if i have profiles on my OSSC), could it be due to the low voltage sent to the PCBs, because the retroelectronik works and he always send about 5,01 volts to the PCBs ?

[SamuelHan]

Hello all, hope you are doing well,

Just a quick update, i’ve bought a new harness and another rgb scart cable and there’s still no sync with the OSSC, it’s really frustrating to be honest, hope the future OSSC Pro will be more plug and play and more “noob” friendly.

Stay safe !

[Author]

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