i have a barco 708mm manufactured in 1999,it is strange the green tube is stable but the blue and red tube picture keep shifting right,what's wrong with this machine

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Most likely it's the focus/H shift board. Email me if you need one. I've got spares.

Don't Forget that all 4 toe in nuts/ bolts must be tight or the tubes will move as the PJ heats up.
Seen it happen a lot.
Roland

Thank you B4 ,the 4 toe in nuts is tight.the blue and red tube shift the same direction while the green one is rather stable.if it is as what curtpalme said then all 3 pictures would shift the same way.is is realy something wrong with it's the focus/H shift board??

I exchanged RGB socket last night the blue and red tubes still shift the same way

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