Last week I worked on two different Sega Genesis Model 1 hardware revisions. While the shells of these consoles are very similar, the boards vary significantly. There was a lack of documentation for the VA7 variation, so I will be uploading my pictures. I know they are not the best pictures, but I think it will be good to get this information out there.
Both consoles look like this, though I noticed the spacing is a little bit different between the ports on the back.
VA6
(I apologize for the color selection of the cables, it would have made this guide a lot easier if I had three different colors, but I had to make do.)
If I remember correctly, the JP2 contact should connect to the ground (middle) part of the rocker switch for both variations. The JP2 bridge must be cut, this is what the switch will replace.
VA7
I cut the JP2 line on the back on the VA7 board:
Both variations required the cartridge slot to be trimmed for Japanese cartridges. I also carved a spot on the back of the consoles for the rocker switch
The Dremel was tough for me to hold at first, so there is a little scrape. The switch fit nicely though, so it works.
I went back and redid the solder points because I did not like them. I wish I would have taken pictures afterward. Hopefully, someone can post better photos of the VA7 but I run across it again, I hope to get some better ones.
Thank you for following!
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