On Sun, 21 Oct 2007 12:55:23 -0700, ChairmanOfTheBored
wrote:

On Sun, 21 Oct 2007 11:37:39 -0700, John Larkin
wrote:

On Sun, 21 Oct 2007 07:15:54 -0500, Spehro Pefhany
wrote:

On Sat, 20 Oct 2007 20:36:10 -0700, the renowned John Larkin
wrote:

On Sat, 20 Oct 2007 18:36:04 -0700, ChairmanOfTheBored
wrote:

On Sat, 20 Oct 2007 14:04:48 -0700, John Larkin
wrote:


I noticed a few process indicators to mention to your PCB maker's QA
folks. Not the contract makers the assembled the unit (or you guys if it
was your folks), the PCB itself.

The stains under the dip package location are indicative of mask
delamination or poor adhesion of it. A condition known as "haloing".

I think that's just the lighting. The board looks OK to me.



Change the resistor packs to the next form factor size up perhaps.

Yeah, we should stop using these things.

There are two edge forms, one is a bit more expensive and solders a
bit better IME. My most recent tiny board (1.75 x 2.9") has 10 of them
(0603x4) which is a lot nicer than 38 discrete 0603 or 0402 resistors.


Got any part numbers or links? It would be worth switching.

And the US8's seem to be getting worse. ROHS plating maybe?

John

It appeared as if you are still using lead alloy processes to me.

Yup, nice shiny joints!


But yeah, vendors going RoHS on terminations can be a pain in the ass.
Being mil, we are exempt, HOWEVER, some vendors have done the RoHS up
your ass screw over on MIL parts that were not supposed to have it done
to them, so we end up having to send some parts out to be re-plated. Talk
about taking a hit on reliability, and cost!

My brother-in-law is pretty high up in Textron. He tells me they're
spending big bux to send ROHS parts out to be retinned with real
solder.

John