On I think all Barco CRT pj up to date have four switches that you control the scan with. Tree for horizontal scan and one for vertical scan, all of them located on the motherboard. I don't know exactly where on the 708, but I know that they are there. Proabably under vertical resp horizontal scanningboard.
As i'm told the 3 switches are located on the motherboard, at the back, right under the metal cover plate that states 'Xray! DANGER!!!'. Remove that plate, remove the board next to it with the cooling thingy attached to it, and there you've got your 3 switches. The 4th one is located in the middle of the board in between 2 other cards, you should be able to find it without removing anything. It has a description next to it something like 'very interesting switch located here -->'
That should do the trick. Be sure to turn power OFF before you start fiddling the switches... (duh!)
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