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My 54620C logic analyzer refused to start up after 20+ years of storage, with a suspiciously bulging M48Z08 zero-power RAM. So I bit the bullet and removed the 48Z08, any data

I did the NewScope LCD upgrade on my 85662A, 8757A, 8510C, and a beta test version on an 8510B. They are excellent upgrades, especially as one’s eyes get a little older. I don’t recall my 85662A

Glad you solved it! Be interested to see what you think of the NewScope kit - I'm thinking of swapping out the slightly dim CRT display in my 8510C for a NewScope-7C

Ooops, picture [image: image.png] Regards Lou VK3ALB

Thanks Adrian, you got me back on track. I did try bending the clips inwards but it wasn't enough. Thinking on your advice, with a dental tool I was able to get some leverage below and the clip

Interesting, not seen that before but I very much doubt it could have been 'threaded' over the pins of a through-hole socket - so I would guess it just has not got a full length bar underneath? Most

Hi all, I'm installing a NewScope LCD in a HP85662 and part of the job requires a distribution PCB to be plugged into this socket. Does anyone know of a way to remove the red retainer clip without

Exiting update, I managed to fix the PSU. The problem was the LM339 comparator. Its output pins were connected to the LT1121 regulator reset pin and was what causing the problem. Replaced it and the

There were a lot of 3 legged tantalums which I hadn't seen before. The two outside leads were negative and center positive.? The ground plane on the processor board seemed unusually heat-sinky and I

Peter, I agree - tantalums are a pest.? Perhaps the problem isn't the tantalums but our fascination with equipment from the dodgy tantalum era.? We can replace tantalums, dried electrolytics, leaky

Acronym?? Like VPS,? VNA Power Supply? And how is the best way to refer to this series?? A bunch of different models with many similar assemblies. 871x?

I think it is useful for many to also write the acronym of the instrument concerned in the title of the Post. In this case HP 8711B.

They may not have them but they definitely will sell to individuals.? I bought a new VFD display for one of my 34401's a few months ago, as an individual.? I could have done it through one of the

Nope keysight has not it. (Anyway I read somewhere that in general keysight is not more prone on selling stuff to individual people, but only sells stuff if you are applied to some kind of repair

See if Keysight has them in stock.? May not be that expensive. Peter

I burn, as an idiot, the VFD of my 33120A (Plugging the main power connector backward, it seem the instrument still functioning anyway) . Anyone have some to sell, or anyone has the entire front panel

Hi Matt, The dim screen is actually a pretty easy fix.? What happens is that there is a mylar film that acts as a reflector around the lamp that ages and curls up around the lamp over time.? All you

I bought a 8753ES about a year ago and yeah Im about to deal with those issues.? I think I paid around $3500 for the 6ghz model. My screen is dim so I have a new led backlights to replace the tubes

There isn't anything directly in parallel with it. Each side is connected to a separate rail so that's a possibility for invalid reasons. In any case, with the new one in circuit, the DMM diode checks

Hi Peter, It seems to be a combination of a couple of bad brands of capacitors, and an engineering thing. The biggest issue is capacitor rating voltage vs applied voltage. It should be greater than