zaxxon monitor sync

cysnake

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Working on a zaxxon. The original board works and sync perfect with the monitor but has no sound. So i replaced it with a complete working boardset from another game (replacement board did sync to the monitor in the game it came from) but will not sync to the monitor in the new game. Is there an adjustment on the pcb itself, or is there an ic that needs replaced?
 
So - you tried adjusting the holds but can't get it to lock? Has this chassis been rebuilt/reflowed lately?
 
Yeah, it wont lock on. I put the old board back in, and it locks right on. I can get it to stop scrolling for a minute, but then it loses sync again. So im thinkin it has to be a board issue, but it did work in another game
 
Thanks! Im heading over to work on it again next week and will check it out. Hopefully thats the problem!:)
 
Thanks cdjump! That was indeed the issue! I wouldve never found that tiny little switch on my own, i had to really hunt for it on the board!
 
That's a super handy post above - for anyone else also trying to find our why their Zaxxon board isn't syncing with a normal monitor (or SCART TV in my case), on Zaxxon the switch is also on the top Sound Board but is called 'Sync Pol.' - in the middle near the RHS edge when looking with the connector at the bottom
 
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