Hi from Spain:
Today I had a problem with my loved HP 8415A.
Here are the details:
All is beign OK and suddenly the coils had phase -90 like a capacitor, and since a time later the light of searching in the front (Phase lock loop) always is active and fluctuating,
When this ocurred I was adjusting a coil for an antenna tuner, without any tension , I only had the coil. I will be very grateful if some expert would can give me some guide before starts my repair work.
Thanks in advance.
Joaquin.