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Do you have an XY monitor? There is video out connectors on the rear of the unit which you can use to obtain video. You can also probe those with an oscilloscope to check for a video waveform if

Hi guys! Can anyone share the disk image for the 86100C? This mainframe runs on Windows XP. I have a disk image for the 86100A based on Windows 98 and I'm ready to share if anyone needs it. Alex.

yeah I already found some on eBay for the entire front panel assembly. I was hoping someone had just the VFD to spend a little less money. (Believe or not but I had already change the front panel

Keysight lists this part as obsolete and cannot be purchased. Keep a lookout on eBay and pick up a front display assembly or low cost parts unit (hard to do these days). [rant on] Keysight has

Acording to service manual, divide-by-N circuitry are ok. Found faulty component: U2 in A10, a phase detector (Motorola MC4044P). It has two inputs, divide by N signal which is present and changing

One was a 20 volt part on a 15 volt rail.? The other was a 10 volt part (!) on a 12 volt rail. I replaced both with 35 volt parts. Nice that the power supplies have current sensing and shut

My impression is that the ones that fail are those that have voltage applied to them which is close to or at the part's rated voltage. One instrument that I'm familiar with used a *lot* of parts

Is board 03326-66516 a replacement/upgrade from board 0336-66505? Thanks -- Joe White KW4YW

Update, the unit powers on. But now is showing other errors. I will create a new thread

Following steps on service decission tree: it seems to have proper signal forms and values. As you see in the photos of my scope, signals described in the service captures attached are present, but no

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