Screaming Circuits: And Another Reason...


And Another Reason...

Another reason to inspect your PCBs before sending them on to the assembly house.

Missing barrel 

At first glance, these boards looked fine. But with a little closer inspection, you can see that the middle barrel isn't plated through. Bummer.

There are a number of possible causes for this.

  1. It could simply have been a goof at the board house. Sometimes a process will slip or someone in CAM will introduce an error.
  2. It could have been caused by improperly creating a library part. Maybe the symbol was built up by hand and ended up with a non-plated hole in that spot.
  3. It could have been built without a library part. Sometimes designers will just create a place for a thru-hole part using vias and traces instead of creating the library part. If that's the case, the center could have ended up with a non-plated hole instead of a plated via.

Myself, I'm betting this was a board fab problem. In any case - another good reason to check out those boards before sending them on for assembly.

And even better then just looking at them - also have them electrical tested at the fab house. Our fab partners at Sunstone Circuits can do that for you.

Duane Benson
Roll out the barrel...
and have a barrel of open solder joints

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