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I’ve been troubleshooting the oscilloscope further, focusing mainly on the Vertical Amplifier board. I’ve attached pictures of the boards and the schematic diagram from the service manual, with

Ozan, Apologies for calling you Onan in a previous post! I also installed a new 2N2219. But installing the 2N3565 was the part that brought it to life! I will upgrade to a 2N2219A when it comes

Hi Barry, Good news. We did try shorting C-E of Q8051 and it didn't change the output, it should have eliminated any effect of Q8051 as the only root cause, i.e. there must have been something in

If you do a Google search on "TDS8000" ... and click on 'images'... you will see that... about 90%... of those pictures show the TDS8000 frame sans the 'heads" Now why is that? I reckon... the heads

Gianni, That post was on 12 December, and you posted that you were expecting the DSA on the 15th. I'm not sure if I'm more disturbed that you found time to lay out 100 pages with text, photographs,

Triggered by the original post by be_moulton, I got a DSA and wrote some notes. You can find theme here: http://www.k100.biz/ebooks/DSA602Alowres.pdf ,if you,like. Any comment welcome, you are

I finally got to the bottom of this! A great learning for me. The bottom line is that the Q8051 transistor needs a lot of gain to drive 2n2219A. The original transistor was a PN3565, 151-0341. The

Thanks!

Hi Richard, The lead free solder does indeed have a higher silver level and a considerably higher melting temperature than the usual silver-bearing leaded variety. In addition to the preferred usage

Hi all, After my TDS8000 eBay bargain turned out to be a nicely working unit, I’m now looking for the expensive part, a Tektronix 80E04 sampling head. I know those modules are for sale on sites

I have used lead free solder with success on the ceramic strips. The solder used was Kester 24-7068-1402 Sn96.5 Ag3.0 Cu0.5. My current understanding is the issue is not the lead it is the LACK of

If we're talking about the same thing, it's an overlay of multiple waveforms.? What it shows is how long the transition takes and how uncertain it is (in time), and where the stable part of the

Hi, I am playing around with the DSA 602A and I am rather confused by histograms. I could create them, but I cannot imagine a way to make them useful (the manual does not say what they are

Apologies if this has been answered but I couldn't find in a search: I'm about to restore my first piece of Tek kit. understand the potential issue with the silver deposit ceramic strips and have

For the archives: the transistors finally arrived, and replacing Q1769 fixed the 7904 autofocus issue, allowing me to complete all the steps in the Z-axis service procedure. Ironically, the readout

I tried it with a 7704A that was pretty filthy, after reading the article here on scope washing and noticing the photo on the last page is of a 7K scope being washed at the Factory Service

Hello all, Many thanks for the tips Was not so, bad nor encrusted, just a soft brush and gently blowing, then isopropyl alcohol. About ESD the scope was grounded, damp and rainy weather. The

Forgot to mention - in real anti-static work environments it's common to have grounding leads or other conductors to keep any air or vacuum nozzles from charging. You can do that too easily enough, if

Check the dust with your fingers before going through a lot of effort. On most old gear I've seen, there is a "loose" dust coating that wipes or blows off easily, but underneath there's a gritty hard

Hi, I recently picked up the hobby of ( trying to ) repairing old test equipment and got a TDS540. I have been trying to get it to boot up but it is stuck with a flashrom checksum error. It seems