Electronics Forum | Fri May 31 16:39:42 EDT 2002 | davef
'Flash' is too thin to bear the traffic of most wear surfaces like Jake is talking about. Follow-up with the fretting corrosion discussion over on the current [Jim Zanolli / Teka] OnBoard forum.
Electronics Forum | Mon Jun 03 06:40:54 EDT 2002 | ianchan
Fair greetings, just a thought on flash gold plating... stubborn brat am I?! thou shalt need to know whether the selective gold plating is for solderability enhancement purpose? or any other undisclosed purpose? at least thy hast not received any i
Electronics Forum | Thu May 30 08:04:25 EDT 2002 | zanolli
Hello Russ, I'm not quite sure I understand your question. Are you saying that you must hand solder these connectors because the gold plating doesn't allow other though hole processing methods to wet the solder the length of the pin in the PTH? Reg
Electronics Forum | Fri May 31 09:13:12 EDT 2002 | russ
Jim, you are right in this. these connectors have long pins 1/2" or so that protrude through the board and are used for mating into a female connector on some other assembly. due to both length and "no solder allowed in contact area" criterias thes
Electronics Forum | Thu May 30 10:32:49 EDT 2002 | alcarey
Does anyone know of a contrator that repairs Universal 4790/91 (Sanyo TCM 1600 feeders)?. Thanks Andy Carey
Electronics Forum | Mon Jun 03 11:51:44 EDT 2002 | Troy
A 50KV machine will allow you to see solder bridges and balls under the BGA. It will also allow you to check placement and can "see" through the metal housing. If you want to inspect for voids, then you what to look at equipment in the 100KV range.
Electronics Forum | Tue Jun 04 22:54:32 EDT 2002 | davef
Solder balls are one of the most popular topics here on SMTnet. Search the fine SMTnet Archives for background. We like to wash solder balls from the board in our cleaner.
Electronics Forum | Thu Jun 06 09:28:24 EDT 2002 | Hussman69
Sure do, it's from the paste that gets squeezed under your R's and C's. This paste is now on your mask and during reflow, wants to move off the mask. Unfortunatly, it follows the flux residue to the side of your component. An easy fix is to use th
Electronics Forum | Tue Jun 04 13:13:58 EDT 2002 | slthomas
Another thing we see is solder balls (sometimes fines, sometimes larger stuff) in the vias after a misprint has been poorly cleaned, as in wiped down but not washed. They end up in the plated through holes too, but those get nicely cleaned up in the
Electronics Forum | Tue Jun 04 14:14:42 EDT 2002 | ckd
I meant to include this in the original message. One, the solder balls are on the circuit side of PCB. Two, some of the vias on both top and bottom are closed and some are not. Is this a process problem with the board house(s)?