EEVblog #690 - TDS220 Oscilloscope Autopsy

Dave dissects and then powers up the Tektronix TDS220 oscilloscope used in the Mud Run. Did it survive?

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[LordFazza]

The braid copper mesh is to join the ground plane to the case shielding.

[greekstraycats]

Video was a great help to open mine.
I use my good old TDS220 for about 20 years and it is still my most used tool and just enough for almost all work I have to do.
Just have to  re-solder the ground-connections to the probe-sockets

[MrBobcat]

Congratulations on completing the mud run and not dying of dehydration with that bunny suit.  Just a guess but I think the weird spongy material at 5:30 was used to ground the board to the nickel shield coating on the back cover.  Unless I'm missing another grounding method. 

[xDRTeK]

I don't know about u guys, but I feel mighty proud. We just made it happen by following Dave from his early home videos to his new lab. Now over and in mud in the name of charity. This goes to tell ya, engineering is not just a way of life. It is a world sport.

[기재훈-xl]

hello, i also have this, power supply in, D17 is burn out, so can you tell me the spec?
is it zenor or short diode

[illustriouschin]

theres a clear waterline on there it must have been sitting in a couple inches of water for a while before you bought it

[AerinLenrith]

Just wanted to point out, Tektronix is still based in Beaverton, Oregon, USA. I know because I just visited their recycle shop and nabbed myself a 7704A in repairable condition for only 20USD. Thanks for the awesome videos, you crazy bloke.

[thewolfin]

Wow. Respectable that it still passes self diagnostics! All it needs is a little TLC wash and a new display.

These were in my college's lab for years, and probably still are. Thanks for the teardown Dave!

[bososz]

The copper braid looks to me like it would make contact with the nickel shielding on the plastic case? Shielding?

[LEKProductions]

I had a loose BNC on the front of one of my analogue scopes. Complete teardown just to tighten a nut.

[juweinert]

10:07 You power it up and what have you got? Power Cycle 256 – what a coincidence, nice!

[rivalo]

"Calibration void if seal broken." Fuck mud, it's the seal!

[brettschacher]

Interesting you brought that Fluke meter in at the end. I used to have a nice Fluke meter that someone else apparently figured it needed a new home with them because it vanished. Some years later I got a replacement for like $20 as it was in a box of other stuff at an estate sale and no one knew it was in the box. My boss was commenting on how it was his already because he was biding on stuff and thought he had gotten that box but he looked briefly at the top of it and decided he didn't want it after all. If he had seen that Fluke he wouldn't have walked away from it.

[spiros]

Hello there,   I have seen Dave using a "plastic style" pen in his videos. Anyone know what is called or where I can find one?

[tpolarbeart]

Hey Dave my 220 scope is missing a few knobs can't find them anywhere you should send them to me :)

[suadcokljat]

5:29 The copper braid thing is to connect ground to nickel plating of back cover. Cheers! S

[Nitrisbot]

Man these higher frames per second video's are great. 

[ian-c.]

You could probably still auction that for charity Dave !

[TradieTrev]

First time ever I had hoped you just turned it on. 

[BenChilds]

I couldn't help but keep looking at the big yellow sticker on the 450 volt cap. Wouldn't the pressure relief being covered possibly lead to cap detonation vs venting if it were to fail?