Electronics Forum | Mon Feb 02 22:05:35 EST 2004 | Dean
Hey Dave, you sound like my local board supplier...just kidding. Incomming inspection will protect you in these cases. Go no-go gauge is a simple as it gets.
Electronics Forum | Wed Feb 04 16:54:04 EST 2004 | mk
Hopefully this is not a stupid questions but, if you are printing low tech surface mount boards, is it possible to print through a mesh screen versus a stencil? Isn't that the way it used to be done? Like soldermask only stainless steel versus polyes
Electronics Forum | Mon Feb 16 05:45:45 EST 2004 | mk
Have you thought about ssd? Boards already have the paste on them when they come in. www.sipad.net
Electronics Forum | Sat Feb 14 20:33:08 EST 2004 | Dean
Grid Lok is the best. http://www.grid-lok.com/ Well worth the money. Outstanding support under the pcb.
Electronics Forum | Mon Feb 16 16:37:40 EST 2004 | adlsmt
I would try it dry first, we have never used solvents in our SPM, AP-20 or UP2000. Wipe every 4 to 10 boards. Normally dont have to wipe when using epxoy.
Electronics Forum | Sat Feb 14 20:30:55 EST 2004 | Dean
What are your preheat rates? Try a slower ramp. A typical insurance policy is to kapton tape the gold card edge. If your problem persists, try baking the boards to drive the moisture out.
Electronics Forum | Mon Feb 16 20:47:46 EST 2004 | davef
Removal: Run the board through the reflow oven with the cooling zone turned off. Then pick the QFP with a pair of tweezers. Replace: Don't clean the solder from the QFP. Just dip them in tacky flux, place the component, and reflow.
Electronics Forum | Thu Feb 19 08:57:20 EST 2004 | northern
Has anyone ever seen a bulbous joint (on 1 side of 1 designator) on every board? I checked the preheat profile at the wave and have played with dwell times but can't get rid of it. I checked the archives and didn't find much. Any help would be apprec
Electronics Forum | Fri Feb 20 07:50:46 EST 2004 | northern
Dave, you are correct they DID move (blows my theory on bad parts)! I will update with the info. you brought up but I have 1000 of these boards on the line as we speak, any ideas on a quick fix? Inquiring managers want to know! th
Electronics Forum | Fri Feb 20 08:44:05 EST 2004 | davef
Lucky guess, eh? [Sorry to blow your theory on bad parts] A 1000 of these boards on the line, ummm. Two ideas to consider: * Increase the conveyor angle [don't get carried away, just keep the angle below 8*]. * Balance the flow of solder so that th
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