Electronics Forum | Wed Aug 11 07:41:52 EDT 2004 | gregoryyork
Check cure of solder resist. Use a No clean low solids rosin flux this will stop problem. Should see almost zero solder balls if put through a single wave compared to a dual wave. If this is true then it is a resist issue and cannot 'resist' the sold
Electronics Forum | Mon Aug 16 04:55:30 EDT 2004 | roel
Concerning the solder-balls, there are a few causes for this. Try to slow down your solder-speed (P.e 80cm/min). Can you measure temperature after the pre-heat zone? Are there also blow-holes in the joints? Personally I think there is some water in t
Electronics Forum | Mon Aug 16 16:57:06 EDT 2004 | Shean Dalton
Try to observe the board as it exits the wave, look for solder snapping as the leads finally exit the solder. The surface tension could be such that a "string" of solder stretches away from the wave until it finally breaks. Then, as the string reco
Electronics Forum | Thu Aug 05 21:47:35 EDT 2004 | KEN
Agreed. Joint failure can happen when un-bagging or durig box-build (at customer site). Careful handling should be used. In one case I had boards returned to me for evaluation and failure analysis. Too bad our site never built the boards!!! (jacka
Electronics Forum | Thu Aug 05 10:38:49 EDT 2004 | iggyslab
Is there a specific epoxy that is most suitable for sealing a polycarbonate chamber, which will have hydrogen flowing through it at no greater than 10psi? Can any epoxy that provides a watertight seal be used for hydrogen applications? We have th
Electronics Forum | Thu Aug 05 11:36:48 EDT 2004 | Tore
Hi, Here is the background: we have a numbers of prototype boards to run, with a QFP144 0.5mm pitch component. Unfortunately the foot-print is for a QFP144 0.65mm pitch. Does anyone know if there is a socket converter on the market for this; QFP144
Electronics Forum | Fri Aug 06 17:28:06 EDT 2004 | Steve
My suggestion is that there are alot of suppliers for this type product. Call a couple of distributors and have them send you samples. Make sure you know each manufacturer so that they don't duplicate. Review the performance and price of each one and
Electronics Forum | Fri Aug 06 21:43:40 EDT 2004 | KEN
In my wiper paper travels I discovered that many different brands are simply "repackaged" from a single manufacturer. Look at fiber size, weave and porosity. In one case two paper were identical, just dyed green. The prices ranged from 26 dollars
Electronics Forum | Mon Aug 09 07:42:52 EDT 2004 | C Lampron
Michael, We have a DRS-24 and are very happy with it. Look at the wobble in the nose cone that holds the nozzles and make sure it does not move. This will degrade your placement acuracy. The machine is very process oriented meaning that you can not
Electronics Forum | Mon Aug 09 07:37:33 EDT 2004 | C Lampron
Abraham, Lead free components in a leaded process should not be a problem. The problem increases with leaded components in a lead free process. For the most part, the only difference that you will see is in BGA procesing. If a BGA is lead free, the
