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supergun rolling picture / sync problems

Posted: April 5th, 2019, 12:20 pm
by mx5dob
Hi all. Im attempting to play 2 vertical jamma pcbs on my supergun:

https://www.smallcab.net/smallcab-super ... anguage=en

But the screen constantly rolls and wont keep still. There doesn't seem to be any way to adjust the vertical/horizontal hold on the supergun and i'm using a standard CRT tv so I can adjust any pots on that.
Can anyone suggest a 'plug and play' solution? (i'm not technically minded enough to mod the supergun)

Something like this that would attach between the supergun and jamma pcb:

https://translate.google.co.uk/translat ... &sandbox=1

or even a scart cable with adjustable pots...

Thanks,
Paul

Re: supergun rolling picture / sync problems

Posted: April 6th, 2019, 3:37 am
by JoeAwesome
What games? Raiden?

Re: supergun rolling picture / sync problems

Posted: April 6th, 2019, 1:18 pm
by mx5dob
Hi. It's last duel by capcom.and thunder Dragon by nmk

Re: supergun rolling picture / sync problems

Posted: April 8th, 2019, 8:01 pm
by JoeAwesome
It's probably not the refresh rates.

Are the PCBs getting 5v, or thereabouts? Does the CRT have any issues with other vertical games, or even horizontal games when the CRT is rotated? I wonder if the CRT has issues with the rotation.

Re: supergun rolling picture / sync problems

Posted: April 10th, 2019, 3:06 pm
by mx5dob
They are getting 5v and my other vertical pcbs work fine (raiden fighters, esp ra.de and sonic wings)

any other ideas?

Re: supergun rolling picture / sync problems

Posted: April 11th, 2019, 12:19 pm
by SuperPang
It might be worth looking for a Sony PVM or similar locally as I believe they have V-Hold pots.

Re: supergun rolling picture / sync problems

Posted: April 11th, 2019, 12:21 pm
by mx5dob
cool. Getting a PVM is on the cards anyway :)