GBS-8220 from Gonbes ( cga to rgb convertor ) pink problem

[extreme]

We do have 2 sega rally deluxe machine ( 50 inch screens ) wich are bad. I connect a GBS8220 converter board directeley from the sega machine to a RGB input of tree different monitors.
After 2,3 minuts , the screen glows very slow to pink color background
( Not the graphics ) . I tried a 15 inch CRT , a 22 inch CRT and a LG
42inch LCD TV with RGB input. Disconnect the converter or pressing the auto button , reset the pink
screen back to black background. then 2,3 minuts later , it starts all over. Any Idea what is wrong ?
Thx

[extreme]

Well , I anser my own question . Its been solved . set clamp st = 3 and set clamp sp 4 . reboot and it works . simple , isn't ?

[woodlouse]

Hi, I am new here but bought a gbs8220 and cant get stable image.
Where are the clamp settings on this card?
My card wont open the "geometry menu" do you think my card is faulty?
Many thanks
Woody