Electronics > Mechanical & Automation Engineering

High density connector troubleshooting

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mtwieg:
I'm working on a produce with a backplane and a daughtercard which connect with a very high density connector similar to this one. We apparently have some alignment issues, as we often get bent/broken pins if we are not very careful when mating the daughter card. But we cannot determine what the alignment error is.

I'm wondering if someone knows a trick for determining what parts of the connectors make contact first when mating. In the past I've seen mechanical engineers check for contact/interference with special paper which leaves visible markings where contact occurs, sort of how dentists use articulating paper to check where teeth contact each other. But I don't know what this stuff was called, and I'm not sure it would be suitable for this purpose (I don't want to ruin the connector, I'm hoping whatever this stuff is can be cleaned).

Anybody know what I'm referring to?

mendip_discovery:
Markerpen? Paint it on, offer it up and see which gets marked. Then clean with IPA afterwards.

DiodeDipShit:
Carbon paper comes to mind :  Black should show up on the gold terminals clearly. You may even find that You don't have to clean the terminals after, per this article:
https://www.frontiersin.org/articles/10.3389/fmats.2020.00219/full
Another thought is these terminals should have alignment pins, are they an option from Samtec Inc. ?

mtwieg:

--- Quote from: mendip_discovery on May 03, 2024, 11:57:38 am ---Markerpen? Paint it on, offer it up and see which gets marked. Then clean with IPA afterwards.

--- End quote ---
Something that could be applied with a marker or brush would be great for odd surfaces like this. But could you be more specific? "Markerpen" doesn't really help. Do you mean something like a paint marker?


--- Quote from: DiodeDipShit on May 03, 2024, 05:08:41 pm ---Carbon paper comes to mind :  Black should show up on the gold terminals clearly. You may even find that You don't have to clean the terminals after, per this article:
https://www.frontiersin.org/articles/10.3389/fmats.2020.00219/full

--- End quote ---
Carbon paper might be the stuff I was trying to remember. Strangely I can't find any reference to it being a tool for mechanical engineering (seems to be marketed more as an art supply), but whatever, I'll order some and give it a shot, thanks.

--- Quote ---Another thought is these terminals should have alignment pins, are they an option from Samtec Inc. ?
--- End quote ---
They do have alignment pins, either small ones integrated into the connector body, or larger ones as separate board-mount components. We've tried both, but the problem persists. It's clear that alignment pins aren't sufficient for full alignment.

mzzj:
Engineers blue? Aka Dykem hispot?
Then there is also pressure sensitive color films like https://www.sensorprod.com/index.php

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