Electronics Forum: after (Page 6 of 656)

BGA re-balling after

Electronics Forum | Tue Jun 25 16:27:11 EDT 2002 | dason_c

Mark, you can check one of the instruction of the BGA reball process as below. http://www.winslowautomation.com/BGA-Reball-Instruct.pdf

Pasteproblem after reflow

Electronics Forum | Sun Feb 06 12:59:33 EST 2005 | GC

Please try to use 6-8 mils ..you are overloading pads surface ..Please verify paste volume vs surface..Have fun

Pasteproblem after reflow

Electronics Forum | Mon Feb 07 12:47:18 EST 2005 | Indy

1. use 6-7mils stencil. 2. reduce aperture opening to 60-70% of pad size. 3. check viscosity of solder paste. According to that you might want to alter your print speed and pressure. Cheers Indy

Pasteproblem after reflow

Electronics Forum | Tue Feb 08 06:43:56 EST 2005 | dhanashekar

we have even tried with 6mil stencil even than we are getting the solder ball thanks for your suggestion

Pasteproblem after reflow

Electronics Forum | Tue Feb 08 10:33:26 EST 2005 | Dougs

have you had any reduction in aperture size though, we generally use a 6 mil stencil thickness with a 10% aperture size reduction for chip components and leaded components ( SOIC - QFP ) and a 1:1 ratio for BGA components without any problems.

Drying after aqueous wash

Electronics Forum | Wed Aug 02 21:36:14 EDT 2006 | Chunks

It depends on the water quality of your final rinse too. Too dirty and pools of water will trap residues on your board. If let to evaporate, these residues can stay on your board.

Drying after aqueous wash

Electronics Forum | Thu Aug 03 16:42:48 EDT 2006 | Merle

The cleaner does have a dryer, but does not remove all moisture - we can see that. It is functioning - we can see that too.

Drying after aqueous wash

Electronics Forum | Thu Aug 03 18:35:45 EDT 2006 | russ

So what are your current drying parameters? can you adjust temp and time? is this a batch cleaner that may have some shadowing from the way it is loaded causing hot air to not hit certain boards? Russ

flux residue after HAL

Electronics Forum | Mon Jan 01 18:11:39 EST 2007 | greg york

Hi Happy New Year HASL fluxes Are very conductive so best advise is get it all off. thanks greg

flux residue after HAL

Electronics Forum | Mon Jan 08 10:29:15 EST 2007 | jaime39

The water soluble flux residue is staying there because the rinsing temperature it may be too low. The flux needs about 130-140 degrees celcius to become soft. If you are using water soluble flux, as per IPC A 610 standards it needs to be remove comp


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