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HP 1746a Problem

Question asked by georgegeorge on Feb 20, 2009
Latest reply on Feb 20, 2009 by dgun
Certainly an older scope but still performs a valuable role in the lab - Question is  - scope takes roughly 20 minutes from a cold start to begin displaying a waveform - screen is completly blank.  After initial powerup the the beam finder will produce an image ( generally a dot)  but it doesn't seem to be sweeping eventhough an input signal is applied.  After roughly 10 minutes ( still no image on the screen) the beam finder will show the image appearing to be swept.  Then after 20 minutes the waveform appears normally and works fine. 
Any ideas would be greatly appreciated