Electronics Forum | Fri Jun 08 18:27:03 EDT 2007 | jmelson
This is probably an inner plated layer of the component that did not bond well. It may be a component that either has the wrong surface finish for lead-free or can't handle the temperatures. Many times I have seen a similar-looking layer when the l
Electronics Forum | Fri Jun 08 17:22:51 EDT 2007 | naynayno
We have been producing an IMS assembly with SMT dpak's for some time. However, we recently encountered a new problem by chance - the parts can be flicked off with a finger nail. I state by chance because the solder joints are wetted and shiny with
Electronics Forum | Fri Aug 28 05:07:59 EDT 2009 | sachu_70
Do you clean the stencil manually or using the automated under-stencil cleaner on your Printer (recommended)? 1. Ensure that stencil wipes are lint-free and soaked sufficiently with solvent before use. 2. If your printer supports automated cleaning
Electronics Forum | Tue Apr 11 11:47:56 EDT 2006 | amol_kane
Hi SMTnetters, I have a white residue coating all over my reflow oven innards (almost looks like white fungus). How can I absolutely be certain that it’s flux and not anything else?are there any tests available for this? I am planning to check the ov
Electronics Forum | Sat Jan 25 20:17:40 EST 2003 | ramanandkini
We are soldering a 8 pin TTL chip on to a CEM1 board that has a hot air level soldering. We use no clean soler paste for the reflow process. Now the customer wants us to clean since he is afraid of flux attracting the dust. We have some SMT LEDs that
Electronics Forum | Thu Apr 13 08:18:46 EDT 2006 | davef
Do a FITR analysis of this white material to help direct you in eliminating the choices. What do your paste and board suppliers say?
Electronics Forum | Thu Apr 13 12:52:49 EDT 2006 | amol_kane
lint from what?...also roughly how often do you clean the oven? (not the heated chamber) but other areas to keep them clean? The operator say he has had to do it twice in 2 weeks to keep it clean due to the residue
Electronics Forum | Sun Jan 26 22:28:46 EST 2003 | iman
we had a project like this once. switched to using "genosolve" chemistry (US source, expensive) in conjunction with a degreaser machine, works fine if you can spend the money.
Electronics Forum | Mon Jan 27 12:02:00 EST 2003 | Mike Konrad
Dave is correct. No-clean flux + water = white residue (unless the proper chemical is mixed with the water). Additionally, no-clean flux + IPA = white residue. Many saponifiers work well as do other cleaning agents. White residue may also be a re
Electronics Forum | Thu Apr 13 04:50:53 EDT 2006 | Slaine
I had something similar a while back it looked like fibreglass insulation in my case (was using no clean flux not water based), i took some and melted it with a soldering iron and it reacted like flux. and i tried disolving it with acetone.
