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Just uploaded some '"quick and dirty" teardowns, mosty HP gear

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intabits:

I've just uploaded a few "quick and dirty" teardown videos of equipment from a recent hamfest haul.
It's mostly HP gear, including a 3455A voltmeter, and a couple of more obscure items.

These videos are simple: Brief description, Open it up, Poke about, Look for simple problems, and See what happens when power is applied.
Hopefully, some will find them interesting...

HP3455A voltmeter.
Seller said it made a bang and lots of smoke when turned on earlier that day



HP3495A Scanner.
Routes connections via reed relays under HPIB control.



HP37201A HP-IB extender.
Carries HPIB communication over RS232 for long range connections.



Tait T348 15V/15A power supplies.
Made in NZ in 1988.


intabits:
OOPS/DOH: Forgot to add links to the videos - Now added after the images in the first post

(My first thought when I awoke just now was that I'd forgotten to include the links. The value of sleep!)

rob.manderson:
You just had to show off that Astor Mickey didn't you!   :-DD

bitseeker:
Thanks for the teardowns. I look forward to seeing how that 3455A comes along.

Regarding the 37201A, it sounded like the mains filter cap(s) have blown. RIFA caps and Schaffner line filters are notorious for becoming incendiary and should be replaced. In the case of the RIFA caps, they're usually encased in plastic and any sign of cracks means a catastrophic failure is just waiting to happen. There are threads on the forum about them.

intabits:

--- Quote from: rob.manderson on August 09, 2018, 12:19:33 am ---You just had to show off that Astor Mickey didn't you!   :-DD

--- End quote ---
Astor Mickey's are status symbols now? Lol, I better get some more!
No, it was pure coincidence. Mickey now lives at that end of the table. He was just an innocent bystander...



--- Quote from: bitseeker on August 09, 2018, 05:01:41 am ---Thanks for the teardowns. I look forward to seeing how that 3455A comes along.

--- End quote ---
Thanks. It should be fun. Just a quick study of the manual for cal failure #11 points to (among other things) possible dud fets.
And these (5088-7028)  seem to be used in no other HP gear, and not mentioned in any  xrefs. A worry if they turn out to be the problem.


--- Quote ---Regarding the 37201A, it sounded like the mains filter cap(s) have blown. RIFA caps and Schaffner line filters are notorious for becoming incendiary and should be replaced. In the case of the RIFA caps, they're usually encased in plastic and any sign of cracks means a catastrophic failure is just waiting to happen. There are threads on the forum about them.

--- End quote ---
That fits the evidence. I know what you mean, I had a (I believe it was a RIFA) mains cap explode in a Tek2465 recently.

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