Dear all,
I have an issue on a HP 8563E Spectrum Analyzer. The 100MHz VCO on the A15 rf Board doesn't oscillate (measurement made at output of the VCO with strap on TEST position). I am sure the VCO is faulty, the PLL loop must work.
Power rails (+/- 15V) are fine.
I have checked the active components (without de-soldering) and none of them seem faulty.
Adjustment of C750 capacitor doesn't bring anything.
I would be happy to know if somebody has already experienced (and solved) such failure or if a component of the VCO is prone to fail ...
I have almost all the VCO active components in spare parts (except the 100MHz xtal) , but before de-soldering on the rf Board, I would be very happy to have your advice.
Thanks for reading and for your help.
Cheers,
DominiqueB
I have an issue on a HP 8563E Spectrum Analyzer. The 100MHz VCO on the A15 rf Board doesn't oscillate (measurement made at output of the VCO with strap on TEST position). I am sure the VCO is faulty, the PLL loop must work.
Power rails (+/- 15V) are fine.
I have checked the active components (without de-soldering) and none of them seem faulty.
Adjustment of C750 capacitor doesn't bring anything.
I would be happy to know if somebody has already experienced (and solved) such failure or if a component of the VCO is prone to fail ...
I have almost all the VCO active components in spare parts (except the 100MHz xtal) , but before de-soldering on the rf Board, I would be very happy to have your advice.
Thanks for reading and for your help.
Cheers,
DominiqueB
So problem solved.
Hope this information can help somebody else having similar problem.
Cheers,
DominiqueB