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Difference in HP8590a and HP8590 CRT?

Question asked by K1MGY on Nov 3, 2015
Latest reply on Nov 4, 2015 by K1MGY
My old HP8590a needed a new display.  So I purchased a new in box unit marked as an OmniVision type.  Same size, same connectors.  However, it appears that the horizontal sync is not proper for the HP8590a.  According to what I can find about these monitors, they handle a wide horizontal sweep frequency range.  Adjustment of the horizontal sync control from end to end does not bring the display into alignment.  Best I can get is a stable display but having what appears to be 5 images.  I'll attach a screen shot here.  Any ideas on this problem?