Electronics Forum | Thu Jul 20 05:04:30 EDT 2006 | bing007
We had a similar problem with gold contact pads. Cleanliness is paramount. If you are using foil tensioning system, wash the foil in a stencil wash before use as the cardboard cassettes may be contaminated. Be very careful when loading into a frame f
Electronics Forum | Thu Feb 01 20:21:34 EST 2001 | huat
Hi, Currently, we use kapton tape to tape out the goldfinger at our area. We still experience solder at goldfinger area, suspected is from washing of misprint boards. Can someone advice me on what is the method being use to clean the goldfi
Electronics Forum | Tue Apr 17 09:53:57 EDT 2001 | edylc
Hi Thrasher7, We called it wash boards, any misprint from screen printer was at tight control ..and those wash boards when being flow down to the line have an identifier /marker , is a matter on isolation of the problem..... But I still can't think
Electronics Forum | Mon Feb 05 20:43:27 EST 2001 | davef
1 Solder on gold fingers comes from: 1a About 70 % of the time it's caused by poor cleaning of screen printer, staging area (table), conveyor, reflow oven chain or belt, and keeping boards separate from cleaning process 1b After loading paste onto
Electronics Forum | Mon Jul 27 17:09:20 EDT 1998 | Rin
| We are trying to reduce the number of units fail at system test due to flux on gold finger. We know so far that the flux is deposited onto the | goldfinger during touch-up or rework and to reduce the contamination we are | planning to imp
Electronics Forum | Sun Jul 26 22:35:55 EDT 1998 | D.Lange
Masdi, Try board shunts. They are hi-temp rubber strips with grooves cut. They can be popped on and off with ease and are much faster than taping and considerably cheaper. They also work great for masking goldfingers prior to wave soldering. Contac
Electronics Forum | Tue Aug 18 12:02:59 EDT 1998 | zambri
| Hi, | Need some advice on how to eliminate or reduce the solder on finger that we are having right now. So far what we understand is that 90% of the problem is due to the reflow process where solder traps in vias causing explosion when subj
Electronics Forum | Mon Jul 27 21:10:10 EDT 1998 | D.Lange
| Hi, | Need some advice on how to eliminate or reduce the solder on finger that we are having right now. So far what we understand is that 90% of the problem is due to the reflow process where solder traps in vias causing explosion when subj
Electronics Forum | Tue Jul 28 02:28:48 EDT 1998 | Bob Willis
The causes for solder on gold are: Paste wash offs Dirty stencils Dirty under stencil cleaning cloths/no solvent Poor handling The most common reason is wash offs when there is a couple of balls left on the tabs and they reflow. With correct profile
Electronics Forum | Tue Oct 26 14:26:28 EDT 1999 | John Thorup
A paint might be pretty but it won't do anything but bad for your fingers. What dave is suggesting that you run a search for is actually a spot re-plating process that you can perform with little mess or fuss. But really, find out why it happened a