Electronics Forum | Thu Aug 16 14:15:11 EDT 2007 | hussman
I agree with Doug. Stop the bleeding first, then find and stitch the wound up.
Electronics Forum | Wed Nov 15 07:21:58 EST 2017 | stephendo
You don't clean contaminated gold fingers so much as you replace them. I once had the "cleaning" solution. It totally dissolved the gold fingers so that they could be replaced.
Electronics Forum | Mon Aug 13 08:04:43 EDT 2007 | davef
Search the fine SMTnet Archives [on gold finger], while you're waiting for others to reply. For instance: http://www.smtnet.com/forums/Index.cfm?CFApp=1&Message_ID=42759
Electronics Forum | Mon Aug 13 10:39:35 EDT 2007 | dphilbrick
If you can not find the source of cotamination then apply masking to fingers until you do find source, single layer of Kapton tape or similar should not affect print thichness. This will eliminate scrap / rework in the mean time.
Electronics Forum | Mon Nov 13 13:49:16 EST 2017 | slthomas
Preemptively you can apply Kapton tape to protect the gold fingers during reflow. I think that's what most people do. After the fact, there are services available to clean them up but as it was described in another thread here, it is not in-expensiv
Electronics Forum | Wed Apr 21 19:17:21 EDT 1999 | Wayne Bracy
Moonman Gee the man with the golden fingers. Glad to see you back around. Makes for good reading.. So go get Steve, Justin, etc. regrads, Wayne
Electronics Forum | Thu Aug 16 14:11:37 EDT 2007 | russ
Check all your conveyor belts and clamping in your machines. You have to follow these boards through entire process to see where it is coming from, it could be happening at a hand soldering operation as well. Russ
Electronics Forum | Mon Nov 13 21:27:02 EST 2017 | slah6678
Hi, thanks for reply. Kapton tape is costly and it may create another handling issue. BTW can you share the thread for the cleaning process ?
Electronics Forum | Mon Nov 13 21:31:11 EST 2017 | slah6678
Hi David, thanks for reply We did doing some study, most properly this problem was due to reflow process. Any thing that we can do for the reflow profile ? slow down the ramp up rate or .....
Electronics Forum | Tue Nov 14 15:48:18 EST 2017 | slthomas
Yes, thanks for bringing up that point, DaveF. All polyimide tapes are not created equal, and in my experience Kapton has always worked for this application. The "better deal" has not, ever.
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