Electronics Forum | Sat Sep 13 09:36:53 EDT 2008 | davef
Lemme tell ya, those are weird looking pix. If OSP boards have not been dried properly prior to bagging and sealing, water can leak from via and ruin the OSP, which will turn black.
Electronics Forum | Fri Sep 12 17:58:30 EDT 2008 | robinj
Can someone let me know what is causing this black coloration around the pads? It is on the edge of all pads all over the board. The surface finish is OSP. I don't have any solderability issue. But the stencil printer is having trouble with picking u
Electronics Forum | Thu Oct 20 20:44:15 EDT 2011 | davef
Design based on: * IPC-SM-782A: Gap 0.0157", Pad 0.0354"X0.0276" [along gap] * IPC-SM-782A Mod used on 32411A1 & Volvo Smart Switch: Gap 0.0157", Pad 0.020"X0.020" [along gap] * IPC-7351: Gap 0.008", Pad 0.0256"X0.0256" [along gap]
Electronics Forum | Thu Aug 01 06:09:01 EDT 2002 | mzaboogie
Hi Pete, The boards are HASL. The frequency is random. The solder balls are randomly deposited along the path of the select wave, not always along the component bodies. We are very careful regarding handling. There could have been contamination on s