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Test Equipment Anonymous (TEA) group therapy thread

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bd139:
Yeah but it ain't cheap!

Think I found the root cause: one of the filter caps is shall we say, incinerated inside the can.

bd139:
Ok regulators are shot, caps are shot, half the diodes are shot in the power supply.

So I bypassed the power supply, which is neatly possible due to two links on the board, and chucked a bench power supply on it.

And you know what? It only still works perfectly. I am extremely surprised!

It pulls a monster current of 40mA per rail and the supply appears not to require tracking so I'll just knock up a LM317/337 type supply, stick and IEC socket and fuse holder on and rip the old ICs and caps out. Phew!

BravoV:

--- Quote from: GerryBags on May 25, 2018, 11:39:13 am ---
--- Quote from: BravoV on May 25, 2018, 11:35:13 am ---Yep, the documentation provides the power details on it's pins, it use lemo connector.

Yep, it will be used at spectrum analyzer, besides my scope only maxed out at 400MHz, a boat anchor Tek 2465B.  :P

--- End quote ---

It would work nicely with the 2465B's 50 Ohm input, though, if you ever need it to.

--- End quote ---

Thanks, yes, I'm aware of that, but for now mainly I will be using it to find & probe spurious oscillation directly at the board level using this probe + spectrum analyzer.

Specmaster:

--- Quote from: bd139 on May 25, 2018, 12:01:57 pm ---Ok regulators are shot, caps are shot, half the diodes are shot in the power supply.

So I bypassed the power supply, which is neatly possible due to two links on the board, and chucked a bench power supply on it.

And you know what? It only still works perfectly. I am extremely surprised!

It pulls a monster current of 40mA per rail and the supply appears not to require tracking so I'll just knock up a LM317/337 type supply, stick and IEC socket and fuse holder on and rip the old ICs and caps out. Phew!

--- End quote ---
Shows how good the original design was if it survived that amount of overvoltage, even if they were a little bit quirky in areas, I like my couple of Heathkit item's and there is still loads on offer.

From mobile device so predictive text might have struck again [emoji83]

Specmaster:

--- Quote from: bd139 on May 25, 2018, 09:34:22 am ---They're quite easy to smoke. All you have to do is stick it across two phases on a three phase system, as our sparky did with a bus bar and a 240V drop a while back. Fecking eejit.

--- End quote ---
I'm guessing that he was getting on a bit and was forgetting the new three phase colours use black for a phase and blue for a neutral. We used to have them reversed, so a coloured cable used to mean a live cable and black was always nuetral. I always thought it was a dangerous move to change our colouring system.

From mobile device so predictive text might have struck again [emoji83]

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