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I just fixed my power supply! That 47uF cap was down to 12 uF. Whoever figured this one out is a genius. Many thanks.

I think that FF picture might be forthcoming; before Michael's FS post was even posted I was discussing with him how his initial batch of pictures?could be shown to better advantage (better

Any pictures of the entire front face .??

Mates, I have available an HP8920A.? Unit appears to be in great shape, but of course, is not new.? Has options 001, 004, 013, 020, 102, 103.? Or at least, that's whats listed on the tag.? There

I do same loop back as a check on power on. The recovery is pretty quick. Maybe the steering line voltage needs to be bumped one way or another. It fixes itself too quickly to determine exactly way

I have never seen that and usually use the SA tracking GEN in full sweep looped back through a cable to verify the RF I/O alignament. Level should be close to the Trk Gen Level and relatively flat

Thanks Adam.? I am determined to get this done myself and learn the instrument.? I have a lot of bench time over a lot of years. ?This is not my first Rodeo as they say. And having the complete

Hi John. Thanks for the reply. First of all, I replaced the A23 as the input Divider on the old one was damaged.? Burnt SMT resistors, and I don't know what else.? it has always not been right since

It seems like a few problems there, Ron. Maybe there's someone on here who would take yours on as a repair and return. Best of luck.

OK HUGE red flag to me is swapping the A23 Input Assembly. Unless you moved the calibration EERPOM over from the processor board? that's just about always going to fail on the receiver test if you

Good day to all.? ?I am a newcomer to the site and need some help on these last 3 problems. I have ready many threads and? I have done searches but came up empty. I will preface this with a

FYI the manual says to let the analyzer warm up for 15 minutes before running any tests. I find that my synthesizer is out of lock at around 350 MHz and 700 MHz if I run a wide sweep in the spectrum

the difference in the reference is due to the CLIP being for the standard version and you having the low noiseversion. usually what I do is open the VCO steering line and insert my own tuning voltage

Well this has proved frustrating, mostly due to the CLIP being (all) wrong! Take a look here: This says it's the Sig Gen Synth (not the Rx Synth) but that it IS in fact A17 (the Rx Synth) and I cannot

I found a node at J46-17. Measures 43V so that looks OK.

Is there an easy spot to check the PS rails? (w/o extender cards) This thing is really buttoned up.

On 8924's that I've repaired with OOL LED (out of lock) on any module it has been the power supply 40V (I think) rail - normally pulled low by faulty electrolytic cap. Uses same modules as 8920/8921..

John - Yup. You are right. I have an 8921 Sig Gen Synth card and the High Stability Reference card installed. I think that's a good sign. The tag on the back lists options 001, 004, 031 and 102. Mark

those are the low noise synthesizers and you should have a matching GEN synthesizer with an 08921 prefix as well. Those need a specific reference module as well ...usually that low noise option comes

Rick & Amtronix are great to deal with. They helped me with my 8924C Jim