EEVblog #1203 - REPAIR: Tektronix 2465B Oscilloscope

Dave repairs a classic Tektronix 400MHz 2465B oscilloscope that's been sitting on the mailbag shelf for years.
Arguably the greatest analog oscilloscope ever made.
BONUS magic smoke escape!
Although it was repaired to a functional level, this is kinda Part 1, as not all functions were exercised and tested, and not all parts were refurbished.

#Tektronix #2465B #Repair

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[DaveCurran]

Why do capacitors have the negative marked and boards have the positive marked? Seems like this sort of problem could be reduced if they agreed on one or the other.

[ElectronicTonic]

Hi Dave. That would be me who sent you those scopes. You and Sagan unboxed in a mailbag, Episode #695, roughly 4.5 years ago. So glad you got one to work. Turned out to be just the right amount of failure for a good troubleshooting video - not too easy, and not BER.

[dfx]

"Easily the best analog scope ever made"


eBay prices have now tripled.

[NICK-uynl]

Always measure the ripple on the rails, don't rely on indicated voltage, very valuable lesson Dave.

[oliviergilcreest]

Love these repair videos. Do more Dave. Doesn't even need the exploding cap to be good!!
Do more Dave! Do more Dave! Do more Dave!

[bobkoller]

The 2465B is missing the blue CRT filter. Slide it up to remove it from the bezel. This one also has the leaky SMD electro's on the control board, with the attendant damage in the area from the electrolyte.

[mathewmcgill]

When measuring using the trace, you're supposed to measure from the middle of the trace, not the top of the fuzzy edge. I'm an old metrology tech who has repaired and calibrated at least a hundred of those scopes. For instance, when you place the trace on the center graticle (to reference it to ground), you're placing that graticle in the middle of the trace. If there is noise on a signal, it may thicken the trace. Not to mention, the trace thickness can change depending on the brightness and focus.

[mtkoslowski]

I have the 2467B and want to say that this video demonstrating your troubleshooting has been very helpful for me in the event that my ‘scope gives trouble. Thanks! 👍

[michaelguzzi]

Just got my hands on a "parts only" 2465, exactly like the older model here. This helped me at least confirm all major bits are here (and some shouldn't be black lol), thank you very much!

[TheHarmonicOscillator]

Great video! I picked up a 2467B at an auction about six years ago, and I love it. It’s my goto scope, so I was bummed when Dave said the 2465B was considered the best. “Doh! Missed it by this much!” But, then he made his comment at the end. Now I can avoid years of counseling and hold my head high again.

[derofromdown-under]

As for the browning of the PCB, those components should have been placed at least 5mm off the board from the factory to prevent exactly what was shown. The power transistor should have been mounted onto a small heatsink... Great presentation once again Dave, well done... 10/10

[wolvenar]

Dave, you can Dremel into the power points of that Dallas chip and solder in wires to put an external battery in it. It's a lot easier than unsoldering that dang thing. Also gives the ability to put the battery somewhere safer for the far future when it leaks

[mduvigneaud]

The video of your chat with Dr. Marshall was really super awesome! Very much *YES!* I loved it!

[nikmilosevic]

Love the 2465B, and Tek scopes in general, recapped mine a year ago. You must restore it, you know you want to... :)

[coyote_den]

"It went through the power-on self-test!"

**BANG!**

Eh, good enough. Ship it.

[EHProjects]

I always love a good old school repair vid!

[diggleboy]

That capacitor went all PUNK ROCKER on that PCB!!! Love your channel Dave! This is what makes electronics so much fun! Failure is learning! Fearless is earning!

[nnamrehck]

I used to work for HP. Love seeing the Keysight scope fixing the Tek scope!

[tra]

I’ve got a 2465B in blue, in pristine condition and i love every single MHz of the 400 inside.

[ElmerFuddGun]

OMG take the LCD shipping protection film off the *121GW meter!* I think *you* can get a replacement if you happen to scratch it any way! ;-P - 10:53