Electronics Forum | Tue Aug 15 07:02:13 EDT 2000 | George Verboven
We are assembling SMD-Leds (Chip LED cl-220yg-c-ts)on flex foil with Electrical conductive glue (Matthey A1401). When we investigated these foils we found cracks between the conductive adhesive and round the edge of the Chip-leds. This cracks cause f
Electronics Forum | Wed Dec 04 14:09:52 EST 2002 | Vince Whipple
By the way, what type of preheaters do you have? IR? Convection? If you have IR, there may be a way to cheat. Vince W
Electronics Forum | Mon Dec 02 17:02:28 EST 2002 | Vince Whipple
Steve, I agree with the recommendation to check the temperature. This is the first place to go. Is this an IPA or water based Noclean? What is the topside temp of the assembly at the effected areas? If you are too cold you will have a tendency to hav
Electronics Forum | Thu Dec 05 11:36:30 EST 2002 | William Guatemala
Have you check the flux gravity lately? If not, Check the flux gravity every 6 hours to make sure proper parameters are meet. Here is a list of things that may cause your solder ball problems; Excecive heat, defective fixtures, preheating temperature
Electronics Forum | Tue Dec 17 13:42:04 EST 2002 | robf
There are a few emerging technologies that have been growing in popularity for the past few years. Pin through paste, press fit connectors and selective soldering machines seem to be displacing custom fixtures. Most of the mixed technology boards o
Electronics Forum | Fri Dec 06 18:13:15 EST 2002 | slthomas
We only have solder balling problems in the interface of the pcb with the selective soldering pallet. All other boards (single, and double sided glue and waved alike) are fine, so I'm not thinking this is going to follow the normal path for resoluti
Electronics Forum | Mon Dec 02 13:16:31 EST 2002 | kenBliss
Hi Steve The people who will have the answer is the experts at EMC Global Technologies. They know their stuff, they are the leader in the solder pallet industry. They design and build them to work right. http://www.emcgti.com for contact info. Hop
Electronics Forum | Tue Dec 03 15:26:07 EST 2002 | GSW
This might be a trival mundane suggestion but try to use non conductive plate to hold components. Probably even made of the pallet material. I am sure your pallet fabricator will have tons of scrap and he can help you find one. T
Electronics Forum | Wed Dec 04 09:24:52 EST 2002 | jseagle
I have found that preheating the solder pallets prior to use helps cut down on the solder balling. Also, we do not cool the pallets between passes and we use a spray fluxer because a hot pallet will knock down the head on a foam fluxer. We use WS f
Electronics Forum | Tue Dec 10 14:10:38 EST 2002 | Randy Villeneuve
Steve, I wave solder most if not all our boards with selective wave pallets. I did not catch if the solder balls were on top of the board or on the bottom but that will make a difference on what to do to get rid of them. Pallets are good and bad. On
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