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The Power Supply Board


 

That looks like a simple 2-sided board. Should be easy enough to verify.

As for replacing a 2.2mH inductor with 2.2uH inductor, no, don't do that.

--Tom

--
Prof. Thomas H. Lee
Faculty Co-Director, SystemX Alliance
Director, Stanford-Samsung Research Initiative

Allen Ctr., Rm. 205
420 Via Palou Mall
Stanford University
Stanford, CA 94305-4070

On 12/18/2023 3:29 PM, sknaugler@... wrote:
Question: Is it even worth trying to fix this board? I am worried about damage than may not be visible. I don't want to put a lot of work into a board that just isn't worth fixing.


 

Sorry, I assumed that MH in the caps only world of the 212 Tek service manual was micro Henry, not milli Henry.


 

In the olden days, M often stood for milli for inductors, but meg for resistors, and micro for capacitors (so that MMF would mean a picofarad --? a "mickey-mike"). Not confusing at all! ;) So, you had to figure out what the prefix really meant, perhaps with a little bit of knowing the context. I look for other components in the parts list, for example, so if I see a 10uH listed somewhere else, then I'm going to feel confident in guessing that these folks are using M for milli. And if no joy there, I look at the schematic and see what makes sense. Hopefully, getting it narrowed down to within several orders of magnitude does not require extensive analysis.

They don't make it easy!

--Cheers
Tom

--
Prof. Thomas H. Lee
Allen Ctr., Rm. 205
420 Via Palou Mall
Stanford University
Stanford, CA 94305-4070

On 12/18/2023 3:49 PM, sknaugler@... wrote:
Sorry, I assumed that MH in the caps only world of the 212 Tek service manual was micro Henry, not milli Henry.