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Test Equipment Anonymous (TEA) group therapy thread
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bd139:
Ok some quick lunch time debuggery today. I have located the 465B failure and for once it's not a tantalum capacitor. Well that's not true, there is one shorted tant but that's not what is killing the 5V rail. It's much much worse!

I eventually chased it around and found out that it only borked the power supply if channel 1 was selected. So I traced that down to the channel switch. And yep, it's a tek ASIC has gone short. But it's not an ASIC! Part is labelled Tektronix 160-0204-00 which is actually a 63S141J fuse programmable 256x4 PROM. Manual confirms this.



Fortunately it's documented!



Now the IC is available for £23 which is a bit much so I am considering what other options I can use here to replace it. The actual original blank PROM is fairly unobtainable and I'd probably fuck it up programming it.

Will mull on it for a few days...
mansaxel:

--- Quote from: Vince on June 29, 2022, 11:30:23 am ---Again it's about the relevance of it back in the day, not today...

--- End quote ---
In something of a break with some of the TEA strains, I don't wish for everything to remain as it was. I've lost lots of time and data to floppies. They always were the bad option. I don't miss them.


--- Quote from: Vince on June 29, 2022, 11:30:23 am ---And what about that scope ? Still waiting for piccies of the boards, have you looked closely to spot signs of corrosion ?

--- End quote ---

Heh, no chance to fix that until I get back from vacation. It'll have to wait.
TERRA Operative:
I find taking .BMP screenshots on my TDS784D scope super simple with the floppy. Stick the disk in, press a button, wait a moment and then stick the floppy into my USB floppy drive and copy the file to my desktop to be poked in Photoshop. And sometimes it even does it without errors!
Easier than setting up cables as the scope doesn't live on the bench, as it's too big for my current setup, and sometimes I use it sitting vertically on the floor in which case I physically can't plug stuff in the back.

For my AWG510, I needed the floppy drive to run Pocket Linux to enable me to upgrade the SSD and HDD to CF cards, but it has Ethernet for comms and sits in my rack, so that will be easier once I get it set up.

Plus, I'm a masochist for old, user unfriendly, unreliably flakey and obsolete tech, so pffttppfffppt.  :P  ;D
Ice-Tea:

--- Quote from: mnementh on June 29, 2022, 11:37:29 am ---
--- Quote from: Ice-Tea on June 29, 2022, 08:52:13 am ---    Free. Just pay for shipping.
--- End quote ---



So... is this a BUSTED scenario, or YAGI gone wrong? Or are you trying to mitigate JENGA reaching critical mass by applying a little BAIT THEORY to the TEA thread...?  :-DD

mnem


--- End quote ---

I... I don't even undertand half of what you just said but it's pretty simply. I don't have the gear to test these, they don't seem to be worth all that much, I can't be arsed to put them on eBay so I figured one of you lot might want to have them for free  ;D
m k:

--- Quote from: Vince on June 29, 2022, 11:30:23 am ---
--- Quote from: mansaxel on June 29, 2022, 11:22:20 am ---
--- Quote from: Vince on June 29, 2022, 11:09:25 am ---

I don't see, back then, how you could offer the same practically in any other way. Surely all TE manufacturers thought like me that ",5" floppies were the obvious choice, and surely all the customers that paid extra to tick the " FDD " option though that too.

--- End quote ---

If I want something impractical, I would sign up to work for a heritage railway. Today, one hangs a serial-to-TCP dongle, driven by the DTR voltage perhaps, on the scope and are done with it. My TDS520 has serial and parallel option, as well as GPIB. That will be useful. Once I get it to run again.

--- End quote ---

Again it's about the relevance of it back in the day, not today...
As for practicality well the TDS 520 scope itself could therefore be deemed just as impractical as the floppy, and therefore be replaced as well... I mean who wants to carry around a boat anchor and have it take so much space on the bench, when you can have today a compact and light portable scope ?

And what about that scope ? Still waiting for piccies of the boards, have you looked closely to spot signs of corrosion ?

--- End quote ---

It's impractical here when you use word floppies and mean crackers.
But anyway, floppies, big and small, were de facto media back then.
Everything after that and before networking were actually more or less fragmented and mainly for backups.
Then when USB-stick came it was too small.
So nowadays an overall situation is pretty good, you can even emulate old hardware quite easily.

BTW,
earlier midnight wasn't me, it was a teaser from daughter, who was also visiting there.
But north from Måns I still am, no matter what.

BTW2,
seems that glue gun(8996681780404) is still available.
Maybe it was a resend from me.
Anyway, can't believe how close to electrocuting our selves we actually are.
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