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Help for HP8703A

Question asked by Link on Feb 13, 2007
Latest reply on Mar 2, 2007 by dgun
The power supply of my HP8703A (electrical part) has failed .The +15V moved to +12V and other voltages are correct.However,if the power supply shutdown is inhibited,the VNA has an almost normal behaviour from 8GHz to 20GHz .Between 140MHz to 8GHz,the trace is very noisy and does not go down from S11 function to S21 function (open circuit on ports 1 and 2.).Would anyone help me to locate the failure or got any idea about it with this description?
Thanks for help.  

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