Taito F3 picture problem

[aoiddr]

I posted this over on arcade otaku the other day, but thought someone here might happen to have an idea of something to try...


I bought a Taito F3 motherboard (with Bubble Symphony and Bubble Memories), and when I hook the board up to my Sega Astro City (15k), I get sound, but the picture is distorted. The picture is not rolling or anything, though. It's stationary like this:

I tested the F3 board in my supergun (which uses a CGA (15k) to VGA board for the display) and the picture is correct on that, so I know the board works. I also confirmed that the F3 board was receiving the same voltage in my supergun rig and Astro City cab.

I tried jumping pins 1 (ground) and 14 (video ground) on my jamma harness to see if that would get the board to display right in my cab, but no luck.

Thoughts? Suggestions?

 

[Kid Panda]

What kind of chassis is in the Astro? If it was switched out with a WG, it will never sync properly, which is what is going on.

 

[aoiddr]

It has a Nanao MS8-29FSG in it.

 

[Kid Panda]

It has a Nanao MS8-29FSG in it.

Hmm, then that is odd. Have you fiddled with the Horizontal sync knob?

 

[aoiddr]

Hmm, then that is odd. Have you fiddled with the Horizontal sync knob?

Augh. No, I didn't. I tried that just now and turning the Horizontal Hold knob did fix the issue...
but wow, this F3 board requires the knob to be turned a full 180 degrees in the opposite direction just to have the screen centered compared to what works on every other board I have (namely my Konami's GX games, my System 256, and my MVS). @_@

Thanks for the suggestion!

 

[Kid Panda]

Awesome, glad it worked for ya!