Electronics Forum | Wed Jan 09 13:39:48 EST 2008 | ck_the_flip
Mask finish is the #1 variable for micro-balling with wave and selective processes. The #2 variable is the Flux. There are some flux formulations out there who're known to have additives that virtually eliminate micro-balling. However, keep in min
Electronics Forum | Tue Jan 15 08:50:07 EST 2008 | ck_the_flip
Based on past, actual, hands-on experience, I have found that the PCB mask finish makes a HUGE difference in solder-balling. Glossy has different surface tension and peelback characteristics than matte finish (ie glossy sucks). http://circuitsassem
Electronics Forum | Tue Jan 15 13:16:25 EST 2008 | ck_the_flip
Yes, the previous "non-balling" flux was alcohol based, but very weak activity. We found it was worth the switch to water-based, to get prettier solder joints - but...at the expense of having to "brush off" solder balls on a couple of assemblies wit
Electronics Forum | Tue Jan 15 13:47:11 EST 2008 | realchunks
Yes, the mask finish is prolly the #1 contributor to solder balling. Seen it many times. It's not that it's cured or not, went down that path about 3 or 4 times as well. Different fluxes can help too. But also check your preheat. If your are get
Electronics Forum | Tue Jan 08 17:46:38 EST 2008 | swag
If the phone jacks have two conductors in them, I would wire them to standard SMEMA connectors so that the upstream side goes to the middle two SMEMA pins and downstream goes to the outermost two pins. If there are 4 conductors in the phone jacks, y
Electronics Forum | Mon Jan 14 12:35:28 EST 2008 | dphilbrick
Jay Go to the Services menu and then station configuration. Choose your F3 machine from the list. This will open the tool that allows you to configure what the machine has on it. Look to see if you have a box with the following: WPC-TR S_WPW_80F
Electronics Forum | Thu Jan 10 09:23:20 EST 2008 | jdumont
Looking for some opinions on what the best, readily available, Alpha lead free water sol paste is out there. Only thing I can see on their website is the WS-819. Anyone with experience with this? We currently are using the OM-338 NC which works great
Electronics Forum | Thu Jan 10 15:26:27 EST 2008 | jdumont
Yes thats always an awful site isnt it? It used to happen to use because an operator was opening the door during the cycle to check if it was done. I smartened up and fired the operator (for other stuff also) and put the washer on a pallet in a big y
Electronics Forum | Thu Jan 17 17:54:22 EST 2008 | dman97
Stay far away from the WS619 paste. It is a nightmare to get a decent solder joint out of it. And dont get me started on voiding issues with this paste. We eventually started to use Indium 3.2 lead free "water wash" paste and this drastically reduced
Electronics Forum | Fri Jan 11 00:32:16 EST 2008 | johnlee9210
Prior to packing the boards, we cover the marking on the IC by dispensing epoxy on top it. This is a way to protect our design so no one can copy it. We have a lot of boards and the optr takes a long time doing it manually. im thinking of using a pne
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