Electronics Repair (sci.electronics.repair) Discussion of repairing electronic equipment. Topics include requests for assistance, where to obtain servicing information and parts, techniques for diagnosis and repair, and annecdotes about success, failures and problems.

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Default Transformer shot! (was scope SMPS/ capacitor venting)

On Wed, 9 Mar 2016 23:37:00 -0000 (UTC), Cursitor Doom
wrote:

On Wed, 09 Mar 2016 18:31:44 -0500, legg wrote:

Unless you've actually cracked one open, you will not be able to tell
what the element construction is.


No need. I have a VNA. Better than x-ray vision.


and everyone has a pair of pliers, or a hammer.

What did the network analyzer say about this particular resistor?
What's the impedance and phase angle between 10MHz and 100MHz?

You didn't use it previously on the caps and transformers.....?

RL
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Default Transformer shot! (was scope SMPS/ capacitor venting)

On Thu, 10 Mar 2016 12:00:41 -0500, legg wrote:

and everyone has a pair of pliers, or a hammer.


Yes, but in the process of investigating the part, you destroy it.

What did the network analyzer say about this particular resistor?
What's the impedance and phase angle between 10MHz and 100MHz?


Why on earth would I need to know that?? The frequency of operation here
as you well know is only 20kHz.

You didn't use it previously on the caps and transformers.....?


Sorry, was there a cap I needed to know the SRF of? As for the
transformer, what would the VNA have told me that the other metrology
didn't? It was testing under the high working voltage levels I'd have
liked at the time to check for breakdown; no VNA I know of will do that.
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Default Transformer shot! (was scope SMPS/ capacitor venting)

On Thu, 10 Mar 2016 12:00:41 -0500, legg wrote:

and everyone has a pair of pliers, or a hammer.

What did the network analyzer say about this particular resistor?
What's the impedance and phase angle between 10MHz and 100MHz?

You didn't use it previously on the caps and transformers.....?

RL


I should quit while you're still only slightly behind because you are
beginning to sound like a troll. You know what they say: "when you're in
a hole, stop digging."

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Default Transformer shot! (was scope SMPS/ capacitor venting)

On Thu, 10 Mar 2016 18:39:36 -0000 (UTC), Julian Barnes
wrote:

On Thu, 10 Mar 2016 12:00:41 -0500, legg wrote:

and everyone has a pair of pliers, or a hammer.

What did the network analyzer say about this particular resistor?
What's the impedance and phase angle between 10MHz and 100MHz?

You didn't use it previously on the caps and transformers.....?

RL


I should quit while you're still only slightly behind because you are
beginning to sound like a troll. You know what they say: "when you're in
a hole, stop digging."


Seeing as how everything's perfect now, I can only agree with you.

I just hope the little tykes at the orphings home enjoy their new toy
and appreciate all the hard work and brain power went into its
restoration.

Halleluyah!

RL
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