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Quite true. At that time of d

Possibly the first thing to think of is if it's in that mode at all? You might consider looking at the outputs of the switches (or where they show up) to see if they are proper. Switches can fail

Hi everyone, My plan is only to fix this unit back to working condition, and hopefully have fun in the process. So there's no plan to re-make the CPU board, that's just to much work, especially for a

Here's my other post on hpagilent from before: "I've been doing some searching on the part number of the output modules 5086-7956. Got some hits including apparently used in some version of the 8590

Correction. I finally got my 7B92A to show both traces (delaying and delayed). I had the wrong combination of CRT intensity, B Horiz Intensity and 7B92A intensity/contrast settings. However what I am

I'll try to post some pictures in the hpagilent group later. There are quite a few pieces in this complicated system, but I've gotten it somewhat figured out, structurally. The 70843B is normally

Hi, have you ever managed to fix the missing portions in the alt/intensified modes? My 7B92A never shows the alternate (delayed) sweep. It just shows the intensified portion of the delaying sweep. Any

I'd suggest a different approach. The backup battery will leak again, sooner or later. In addition, even with 150 mah, if it's in storage, it will go below the point where the cal constants are valid.

One point to be aware of is how it is charged. If a cell is charged too fast or for too long, it will be damaged. An "intelligent" charger will determine when a cell is fully charged, and stop

Can you post some photo of the board somewhere on the internet? It is always interesting see what is inside mysterious instruments Il giorno sab 21 lug 2018 alle ore 20:20 Jim Ford

Hi everyone, I need to replace the backup battery of a DM5010. It has leaked but I cleaned up the mess. The service manual specifies a Nickel Cadnium 2.4V 150mAH at 14mA. So far, I was able to find

Hi, Ed. I'm forwarding your message to another Ed I know who may know something about this beast. I envy you for finding it! Jim

Thanks, Dave! I will try the largest value cap I have in parallel with C821 this evening. The rest of the day is dedicated to my other addiction (I meant strikethrough) hobby, playing musical

I posted this in the hpagilent group a while back, but no one seems to have info. That group seems pretty quiet lately, and I don't see indications that it's moved to groups.io yet. Since it's mostly

If either of the rectifiers were shorted, you would see the waveform go negative across C821. The minimum value of 2v indicates they are OK. This is OK. This

Thanks, Harvey. So I checked out the 8 V supply feeding the 5 V supply - it looks really bad! Similar waveform to the 5 V rail but dips from a high of maybe 14 V down to about 2 V. That's at the

Hi George, Glad it worked for you too! I guess you may have figured this out as well but when it comes to re-engaging the slots in the SMA connector with the stripline I found the springy stripline

Yes, both of my 7A29s are like that. On one of them a couple of cams had rotated so the attenuator settings no longer made sense. I added a fillet of epoxy at each side of each cam (I used Loctite

Adrian, I was able to restore one and now two of my 7A29 units following your procedure! It is definitely a ground contact issue between the resistors and aluminum block. One more to go. It is indeed

Not sure it will work, but I'm attaching a scan of the 465 manual pages describing the option. It's basic SMPS EMI filtering plus a mesh screen on the face of the CRT. I'm guessing the mesh screen was