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This is my point exactly about feature creep on these threads, haha Guys, it really shouldn't be that hard. As a little proof of concept yesterday (the post hadn't been approved yet and I was itchy to

I just acquired a PS503a module, very clean. Upon first powerup there are two items. First. the CM7220 incandescent lamp in the positive side appears to be burnt out, resistance checks show about 62

After I successfully completed CAL 01-04, I still get a failure on boot-up. This is what it said on the scope: ALL 00 PASS XX<F77F> So it passes everything but fails. Huh? I found in the service

On Sat, Apr 30, 2022 at 11:21 PM, si_emi_01 wrote: > > Do you have a lot of Overshoot or Undershoot on the waveforms you are > supplying it? On the other scope, what is the Rise and Fall Time? If it

The cross reference table listed on 4 pages before the Schematic 9 are for this purpose. It is pretty easy to locate components on the board and on the schematic this way. I found the scanning quality

How does current that initially charges C1025 flow? Is it like the following? T1020 PIN4 -- R1020 -- C1025 -- CR1035 -- R1046 -- T1020 PIN6 This is not the only path, but seems the least resistant

If your ordinary iron is hot enough to melt it, you can remove just about 100% of the existing solder with desoldering wick. --Toby

Thank you so much Mark. I have replaced a few capacitors that I can tell or measure to be bad. I have not gone systematically, because of the limited supply. I have order a bunch of more generic ones

I almost like the idea of replacing them with modern connectors. The current "patient" is a 7514 and I don't know if it's the case with the Main Interface board in that scope, but in my 7704A, I ran

Hi Stephen, [I didn't (re)read the whole previous repair story.] Are you sure now that the sweep generator itself is not the problem? If A and B sweeps show the same problem then the problem is likely

Yes, I had not seen this page either, and nobody mentioned it a few weeks back when I was asking similar questions, so it must be fairly obscure. I'm especially interested in the possibility of

As a thought... Would the covers be 3D printable with a resin type of printer? Resin types (allegedly) have much better print resolution, but I don't know if the prints would have sufficient strength.

Since you have all of the "bits" needed with an LCD Display, it would be nice to be able to have an on-board USB Interface and application software with storage and overlays to display it on a desktop

Yup. My first Oscilloscope was a Tektronix 551 back in 1979. It had 98 Tubes. It had 2 parts. The Oscilloscope and a separate Power Supply. I located the Power Supply under my bench on a step stool.

I think letting the 575 576 577 drift off into oblivion with repairs only, not mods is more like it. What I'm describing is a standalone transistor and tube tester that takes 15 X 10 cm of benchtop

John, In putting in this effort in to a 576, retrofitting it for an LCD display rather than a CRT. A requirement for this project in my mind will be to delete the need for the HV transformer. This

Your earlier idea of using an LCD screen instead of borrowing a scope screen leaves off the electrostatic CRT display and limitations of 60 Hz AC sweeping. Two ADCs are needed, one for V one for I.

I second this I still need to get one of these spun up as well. But Dennis's document is fantastic. Zen

Martin, Depends highly on the digital scope. And the vertical step resolution. I think in the rigol world last time I tried it the best resolution I got on the input is 10's of mV steps. So you would

Bonjour cher Monsieur We have 576 and 577 for decades. ours were from local auction and Ham radio Fleas. Typically shipping them is risky as the CRT and panel controls are easily damaged, sine they