[Test-Equipment] HP 8673M 2-18GHz generator problem

[John Miles]

Cool.  What's the date code on the cap?  Did it look like a botched repair
job, or was somebody asleep at HP that day?

-- john KE5FX

>
> John,
>
> Thanks for your reply. I did fix the unit and it is amazing how simple
> it was.
>
> Someone mounted the minus 40volt power supply filter capacitor
> incorrectly
> on the power supply board. The -40volt power source was not being
> filtered at
> all. Fixed that and the unit tool off and worked correctly,
> locking right up.
> I then went through and adjusted all of the YIG preoutput freq
> settings according
> to the manual, and the YIG driver for proper freq range. If
> anyone plans on doing
> theirs, you will need to resolve to 6 digits of accuracy on those
> voltage settings.
> Fortunately I have an HP 3456A 6 digit DMM to do this with. I
> checked the output
> spectrum on my HP 8569B and looks like we are meeting specs for
> phase noise
> and harmonics.
>
> Jerry Mulchin - N7EME
> JWM Engineering Group
> http://jwmeng.com
>
> http://mailman.qth.net/mailman/listinfo/test-equipment
>