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HP-8753B additional vertical lines at the screen (CPU-UNIT?)

Question asked by DD9UG on Jan 1, 2009
I have a HP-8753B with a problem in the CPU-Unit (word generator), I think. The display unit works, I removed the CPU-Unit - got the test pattern, ok.
But at the screen are a lot of additional vertical lines and the grid is unequal. The vertical lines change there position with the displayed letters at screen. Have made photos about this. Do you have any idea or help to get this unit run?

Thanks for your help and a successful new year!