Electronics Forum | Fri Feb 18 11:14:07 EST 2005 | russ
I would be willing to bet that you are ramping up way too fast and possibly too hot/long of a soak and killing your flux activity. this will give the appearance of "no reflow" due to non-coalescence of the solder balls. check this board with the hel
Electronics Forum | Fri Feb 18 17:57:46 EST 2005 | Grant
Hi, The normal electronic components you purchase should have lead free variants. Also, all solder paste manufacturers have lead free solder pastes, so you just need to get the paste specification, and then re-profile your oven for it. Temps are hig
Electronics Forum | Tue Mar 01 11:11:50 EST 2005 | spot
We use SRT. We still have machines that are over 5 years old and are functioning very well in the BGA, QFP and yes CSP area. The critical part is getting the right Air nozzle for the part size. Also the software has a auto-profile feature that wor
Electronics Forum | Wed Feb 23 09:33:03 EST 2005 | rlackey
Hi, Does anyone have any experience of using electrically conductive adhesives, including info on the following? 1) Autodispensing/screen printing 2) Curing temps/profiles 3) Quality/conductivity of joint 4) Product recommendations Our customer w
Electronics Forum | Mon Feb 28 16:04:30 EST 2005 | Alex
I use to have that kind of problems with other type of machines and here are the causes: 1- Spray fluxer head partially obstructed (check flow rate) 2- Defective pre-heater probe (manually check temps) 3- PROFILE (last preheat to 280) 4- we sometimes
Electronics Forum | Wed Mar 02 04:52:42 EST 2005 | GV
Cookson solder paste 256 seem to be a good and very active no clean solder paste. We have some good experience. We did not bother to evaluate oters since we have had good results with this solder paste. May be you can try. Most important is the reflo
Electronics Forum | Wed Mar 16 08:06:52 EST 2005 | zsolt
Grant is right, also for us was the easiest solution to us custom pallets. But you should also try to tweak preheat zones settings. The flux manufacturer should give you some basic temperatures where the flux gets activated. Also it is worth to make
Electronics Forum | Wed Mar 30 16:52:41 EST 2005 | chunks
Someone sells the T-couples that are in a rigid tube and the base attaches to the edge of the bord. They have an adjustment nut on em you can adjust to spring load the T-couple on the are you need. They do produce a wavey profile from the part expa
Electronics Forum | Thu Apr 14 18:51:19 EDT 2005 | KEN
What side is the short occuring on. Topside or bottom (solder) side? 2. Pitch of hole pattern = ? 3. Your x-ray may not have the resolution or DSP capable of detecting this defect. How does your profile look? Is this a true short or the result
Electronics Forum | Thu May 05 17:15:46 EDT 2005 | russ
You got what I think someone has called a "cold melt". If you were to run your removal profile awhile longer you would not see this. Anyway, you don't have any issues as this is very common (at least in my experience). FYI I was thinking your oxid
