SDS100/SDS200: SDS100 exposed Solder points

[hruskacha]

What are these two dots for? I feel like it would be covered if it was any normal circuitry. Are these taps for something maybe?

 

[a417]

I haven't had my 100 apart to check, but those look like the solder blobs that some companies use to bond two panels together electrically. Have you put a meter across them yet, or each to ground?

 

[hruskacha]

I haven't had my 100 apart to check, but those look like the solder blobs that some companies use to bond two panels together electrically. Have you put a meter across them yet, or each to ground?

Ill try it. If i dont get a voltage thats similar to the battery, i bet a scope would be better.

 

[a417]

Ill try it. If i dont get a voltage thats similar to the battery, i bet a scope would be better.

I can't imagine a solder blob that big, that's exposed like that, would have anything worth scoping on it. Just a hunch. If it was marked with a TP or something maybe, but that looks atypical to every exposed test point i've seen.

 

[RandyKuff]

Without opening the scanner up and just looking in the battery compartment...
I can see tabs going up... My guess is maybe grounding for the display board to the other boards...

 

[Chris0516]

I can't imagine a solder blob that big, that's exposed like that, would have anything worth scoping on it. Just a hunch. If it was marked with a TP or something maybe, but that looks atypical to every exposed test point i've seen.

Exactly. Not just one, but two. Also evenly spaced. So they can't be solder joints.

 

[n1chu]

There are also multi-layered circuit boards, not individual boards that plug into each other, that’s “stacking”, but separate boards sandwiched together permanently, giving the appearance of one board. Certain connection points between boards may be made (or left vacant), depending upon design using these solder points.

I am not saying these multi-layered boards are used in the scanner, I have no idea. But they ain’t cheap, the design process is involved, making sure components don’t interfere with each other simply by close physical proximity to each other, not to mention the elaborate manufacturing involved. And I don’t know if they are being used in a deliberate manner for hysteresis or eddy current (an antenna of sorts where either of those globs of solder are actually acting as circuitry components. Another thought is the tabs are simply a way of dissipating internal circuitboard heat. So, from a cost standpoint, if I were to guess, I’d say multi-layered boards are not used and you can disregard all that I have written here… although I HAVE run these scenarios by an engineer who works with multi-layered circuit boards for satellites, who tells me all are viable considerations (with the exception of the hysterisis and eddy current suggestions which he finds a bit over the top… but it did cause him a moment of pause. He also volunteered a known phenomina when working with a satellite’s longevity… that of “whiskers”. A whisker is the interactivity between components that actually complete electrical paths and short them out!).

But your query is well taken, the need to identify the solder globs purpose BEFORE going forward with any thoughts of using them for whatever purpose. Sorry I couldn’t identify them for you.

 

[hunterca]

Those two pins are grounds. just used my multimeter and using the charging cable attached.