Response from Jonathan: Misty,

Sounds like you might have some sort of sync and/or hold issue with your Street Fighter 2 arcade cabinet. We recommend starting off this repair by trying to adjust the horizontal and vertical hold potentiometers (or pots) on your monitor chassis. You might also try adjusting the B+ voltage as well to make sure it is within range.

If you do those things and you still are having this issue, you might double check the wires running from your arcade board to your monitor chassis to make sure they are making a good connection. You need to check your monitor sync wire in particular as that is probably the one that’s giving you trouble. Another thing to keep in mind is that the input pins on the monitor chassis might be a little loose due to cracked/cold solder joints that have developed over time. You might try touching up the solder on these joints to make sure they are connected properly to the monitor chassis.

Of course, you could have an issue with the monitor chassis itself. Sync and hold issues on G07 monitors are usually attributed to transistors X301-X306. You might check to make sure that these transistors are working properly. IC501 can also cause some hold and sync issues as well. Make sure that this is also working properly. Additionally, you might check out the G07 notes on Bob Roberts site as it has some great tips on solving G07 sync issues with newer style PCBs.

Hope that helps. Thank you for your question and good luck with your repair.