Electronics Forum | Mon Aug 05 14:00:11 EDT 2002 | pizzafred
Yes, VJ is a good product. However, there are so many others... Feinfocus, Phoenix, XTek. In this market call all of them and make sure that you buy on the technical spec to your need! T
Electronics Forum | Tue Jul 30 21:44:13 EDT 2002 | sohct
Hi Anyone has experience in manufacturing RF PCB and encounter voids on the grounding pads? The grounding pad is covered by the a big component. Question is does voids in the solder joint affect the RF operation?
Electronics Forum | Wed Jul 31 07:44:54 EDT 2002 | mzaboogie
Hi Pete, It is an alcohol based NC flux. The machine does have quartz preheaters. We are preheating to the temp specified by the flux. Thanks Chris
Electronics Forum | Wed Jul 31 10:55:06 EDT 2002 | patrickbruneel
Christopher, Is it possible to get some more info like type of no-clean flux you use and process parameters topside temp of board before entering the wave and dwell time in the wave. Patrick Interflux USA, Inc.
Electronics Forum | Wed Jul 31 15:04:27 EDT 2002 | russ
You may want to increase the time of preheat? This might help ensure that all of the alcohol is completely gone. Just a thought Russ
Electronics Forum | Wed Jul 31 17:08:22 EDT 2002 | pjc
Chris, What's the board finish? HASL? What's the frequency of solder beading, like how many joints soldered exhibit these solder beads- percentage wise. Are the boards clean- nobody is touching them with greasy fingers? We need more clues.
Electronics Forum | Thu Aug 01 06:09:01 EDT 2002 | mzaboogie
Hi Pete, The boards are HASL. The frequency is random. The solder balls are randomly deposited along the path of the select wave, not always along the component bodies. We are very careful regarding handling. There could have been contamination on s
Electronics Forum | Thu Aug 01 11:16:16 EDT 2002 | mzaboogie
Hi Pete, That's what I thought originally. The equipment manufacturer stated that this was common among No Clean Selective solder applications. I was trying to get a feel for the validity of this statement. It seems to me that there would be a lot o
Electronics Forum | Thu Aug 01 14:23:47 EDT 2002 | pjc
Ah, yes...the solvents. I'll bet with SS machines vs. WS machines there is way less dwell time at preheat so you don't evap enough solvents. Do any of these SS machines use force-convection preheats or are they and IR type?
Electronics Forum | Sun Aug 11 18:53:53 EDT 2002 | edmentzer
Chris, could you tell me which brand of selective soldering machine you are using? We are looking at some machines at this time and I would like to which vendor has the best support. I have looked at RPS/TYCO and Vitronics.
