Okay, first off, I'm a newbie. I tried searching the forum but got an error in the search. So if there is a post about this, please forgive me for the post.
I recently was given an old Zaxxon cabinet. It had a monitor and some transformers and a jamma harness installed. the monitor wires were just hanging in the back of the cabinet. I bought an atari Tetris jamma board, so I could build a tetris game for my wife(her favorite game). I checked all of the jamma wires and double checked them. i connected the monitor to the jamma harness. Turned on the game and the game loaded, but the screen was shifted to the left by 1/3 to 1/4 of the picture. I tried to adjust the H freq and could get the picture to shift right just a little but then it would scramble up. The screen would also scroll upward a little.
I tried to get that to stop by adjusting the v hold but it would scroll up and stop for a few seconds then scroll again.
so everything i have found points to the h sync and v sync. i found a manual for the tetris board and also for the G07.
Im just unsure of how these sync wires hook up. there is only one sync wire on the jamma harness, but the board has an optional 11 pin video out spot for a harness. do both the positive and neg syncs need to be connected?