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If one is making a board for CM4 module: how does one solder those two connectors to be perfectly aligned? Are manufacturers using some kind of jig for each bo
by antattack 5y ago
If one is making a board for CM4 module: how does one solder those two connectors to be perfectly aligned? Are manufacturers using some kind of jig for each board going through reflow?
- geerlingguy 5y agoThe pins are sufficiently small and tightly-aligned that the connectors seat themselves nicely centered during reflow. Though a few of the boards I've tested do seem to be very slightly off, but you can still pop the Pi into the connectors.
- pathartl 5y agoLots of flux and a way to inspect it. There's tons of cheap USB microscopes out there now that you can use for soldering. If you put a tiny bit of flux underneath the connector, heat it up, and let it sit you'll make it tacky and can lay the connector on it. Tape is also usable. Just get the ends and then remove it to do the full thing.