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You can count missing contacts by counting the locations on the rotor where the little plastic posts are broken off. Dave Wise

Renuad, Those are all great places to start. I have one of these units and I used the technique described on these articles. The epoxy/glue option works very well. I did this on all of the wipe

Hello Mark, Indeed there's a lot on the net about those. Here are some: https://qsl.net/w0mpm/HP8640B.html https://www.qsl.net/ve7ca/TstH86.htm#HK22 https://jvgavila.com/wb1.htm Good luck! Renaud

There are some good articles on the Internet regarding this problem. Also there is a web site for a company that offers serving of these units, for a price. You ship the entire unit to them and once

Fixed, thanks Jon.

Ian, There's a group for the the HP 892XX series it's /g/HP8924-Family-Spectrum-Analyzers/topics ,? Amtronix supports them & provides help their website is

Thats better, hopefully someone will recognise the issue. Picture is still a bit fuzzy, though I can easily see the two lines at the top of the screen, the second showing the error. The other

Hi to the group new to this group I have an HP 8640b the frequency range switch has dropped some of its contacts and looking with the times 30 loop on the plastic discs it looks like I'm missing a

I saw three and ordered two to have a spare.? Since I have three of this meter and now know about how they can fail I can just replace them as needed.

Hi Francesco, just in case this information is still useful to you or anyone else... These assemblies (mixer plus bracket and two resistors) are from a Marconi X17653 Low-Band Receiver unit, part of

Hi Peter, If I am not mistaken there are 2 Omron relays on the board. If one failed maybe the other one will fail soon so if you make an order and have the unit open it is better to replace

I have tracked this down to K104 and confirmed by bench test the relay has a bad side and won't make continuity to the DC high range attenuator.? With the relay removed I can jumper pins 9 to 13 and

The 5300-series counters also have the advantage of portability if the battery pack “plug-on” is added. Jeremy N6WFO [email protected]> wrote:

Hi David, Thanks so much for the reply! My “spare” 5245L counter started working so until I get the repair on the current non HP gear fixed so I won’t be tearing into the busted instrument until

Hi Jared, Thanks for your inputs. The 3457A doesn't use an NVRAM chip (as other HP instruments do), it uses a low-power CMOS static RAM with a permanent supply provided by a lithium battery. The

Re:-? ".a error does show" What is the exact error message? A photo of the screen would be good. (Cropped and processed to keep the file size sensible.? Saved in a format everyone can see.? .jpg

Apparently there are security countermeasures in place to prevent the cal data being written back in via GPIB (Understandable for this sort of equipment, can't have bad actors poking around ruining

Hi Peter, thanks for the advice. I have completed the other repairs? and powered the unit up. amazingly frequency and amplitude appear to be pretty much spot on. Not bad for a unit that hadn't been

smps included *12volt rail* 12V 3A 36W *5 volt rail* 5V 6A 30W *43 volt rail* 24V 1A 25W ? Quantity 2 *+ and - 14volt rails* 15V 2A 30W ? Quantity 2