Electronics Forum | Wed Sep 15 13:03:18 EDT 2010 | dan_ems
First of all decreases to the minimum the reflow time (45-50 seconds) and if does not work, try with another type of slder paste. Good luck !
Electronics Forum | Wed Sep 15 20:59:23 EDT 2010 | genesan
hi All, Here i snap shot previous PCB(HASL) and current PCB(Immersion Silver).Base on the photo it could be PCB oxidize cause the non wetting?
Electronics Forum | Wed Sep 15 04:12:11 EDT 2010 | headlad
We had a similar problem so we shrunk the thermal and extended the pads. This allowed us to ensure solder resist was applied to the track in between. It fixed our problem.
Electronics Forum | Thu Sep 16 08:47:39 EDT 2010 | headlad
I extended the pads to help ensure the component locates correctly and to allow for easier re-work should problems occur. I reduced the thermal by 5% but you may want to speak to your fabricator and ask what they require to ensure that the resist is
Electronics Forum | Thu Sep 30 17:04:39 EDT 2010 | 18424
Try Looking at Selective soldering, Unless you have that many through hole components. Ace offers a great machine for selective soldering.
Electronics Forum | Thu Sep 16 16:18:14 EDT 2010 | cbudzinski
we have been using DESCO Statshield Protective smock for about 7 months and some are starting to fail test. Is anyone else having any problems?
Electronics Forum | Fri Sep 17 11:20:24 EDT 2010 | SMTAZ
Our facility is typically a high mix low volume site, but lately we are getting increments on our requirements therefore we are kind of struggling to cool down our ovens before to change over a different recipe ... any suggestion on how to speed it u
Electronics Forum | Fri Sep 17 11:47:37 EDT 2010 | namruht
How long of a lag do you have now on the cool down. What type of reflow oven are you using? Are you talking about change over from a Pb Free to a leaded product on the same line?
Electronics Forum | Fri Sep 17 17:00:39 EDT 2010 | AL
we are using convection ovens and we face the issue when changing from Pb to RoHS but also even when change top side to bottom side if the diference on the profiles needs to go from a high temp to low, we are opening the hood but we would like not to
Electronics Forum | Fri Sep 24 04:02:39 EDT 2010 | emmanueldavid
@Sachu: Thank You. Well AL, hope You get the real but to compromise on the time. Many Thanks, David, India.
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