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70900A YTO lock problem

Question asked by terman on Oct 1, 2010
Latest reply on Nov 11, 2010 by JohnMiles
MY 70900 A will go to the prescribed frequency , but "jumps" 40 - 160 MHz intermittently.
the phase noise quality is good when  locked. The 300 MHz reference oscillator is also very good  and is not intermittent
Any thoughts on what I might  start examining ?
The service manual that is available is without schematics , so any schematic help would be appreciated.