Hi,Pelleman, I have a GOS-643 that has a problem in the vertical section(off screen).If I remove the delay line and feed a variable voltage to it,I can get a good trace(H ok).Do you still have a schematic and trace diagrams for this machine.I set aside for a couple of years,as I have another scope,so wasn't in a hurry to repair it.I tried marsa.se but the site has disappeared.Any help would be appreciated.