Sega Blast City Versus Kit Troubles

[Anselmo]

Hopefully someone with some experience with Sega's official versus cable can chime in. @GeeDee's post motivated me to bust out my versus kit I had tucked away, and at first it worked fine when plugging it in. Then on the second "power up" a few moments later, I started to have Sync Issues on the slave cab. I though maybe my ms2931 was failing at auto syncing. It wasn't, it auto syncs fine.

I did a some moving around to test the two different cabs (tested both cabs, several pcb's and different resolutions) and I have isolated the issue. The versus harness has a connector that connects to the CN7 on the Blast city IO board. That connector has what appears to be RGB/Sync/Ground signals coming out of the Blast City IO that connect to the CN2 on the official Sega Vs Link video buffer PCB. The moment the 6 Pin connector touches the CN2 on the PCB I get the image problems, it looks squiggly like if it's running the wrong resolution If I remove that connector from the video buffer board, the picture is restore. This happens wether or not the Buffer board has power.

Knowing this, would you feel I have two bad blast IO boards, or that maybe my Sega Versus kit buffer board is bad?

 

[Anselmo]

Alright, so I've isolated this down to the buffer board. I have tried a 3rd blast and the issue is still there, once the buffer board connects to the cab it is introducing some type of interference that causes the monitor to lose sync. This happens on both 15khz and 31khz. What's strange to me, and if you can chime in on this for anyone versed enough to do so, ....if the buffer board is bad, can it be sending out a signal or something in reverse? The signal is supposed to come out of the Blast IO board into the buffer board, but I suspect the buffer board is outputting a signal or some type of interference out. It does it even if it is not powered on. What can we conclude
from that?

 

[striderzero96]

Bumping this thread since I had the same issue with sync loss while using the versus kit. However, I have isolated the issue down to the Blast City I/O Board not having the VS. Kit wiring fully connected in the I/O. Particularly, the bottom corner of the connector for CN7. If anyone has the side lock not in place, then the connector tends to get loose and causes sync issues.

After firmly making sure its in, everything worked as normal.