Electronics Forum | Tue Nov 17 08:36:28 EST 1998 | Chrys
| For some as yet unkown reason, we have started to have some boards sag and go under the wave. The boards are surface mount top side and conventional components wave soldered. We have checked the wave hight and both the profiles on the wave solder a
Electronics Forum | Mon Nov 23 19:34:51 EST 1998 | Mike Demos
Charles: Here are a few possibilities you might want to check: 1) Conveyor width -- if the conveyor is too tight this will cause the boards to buckle as they go through the preheat section. We recently had this happen when we changed operators. 2
Electronics Forum | Fri Nov 13 09:55:08 EST 1998 | Chrys
| We are experiencing 'lifting' on one or more sides of a QFP. Poor lead co-planarity has been ruled out by independent tests. Please tell me which of the two remaining failure modes is the most probrable? | | 1. Expansion of gases in vias underneat
Electronics Forum | Thu Nov 19 05:25:07 EST 1998 | karlin
| | We are experiencing 'lifting' on one or more sides of a QFP. Poor lead co-planarity has been ruled out by independent tests. Please tell me which of the two remaining failure modes is the most probrable? | | | | 1. Expansion of gases in vias und
Electronics Forum | Fri Oct 23 16:01:18 EDT 1998 | Earl Moon
| I need some info on how to stop the bridges I'm having on | radial and axial parts that are in the same place on every board. I'm also having problems with sot-25 bridging. I'm using a Electrovert E-pak. I tried leveling the machine,solder pot, an
Electronics Forum | Tue Sep 22 09:59:15 EDT 1998 | Mike C
| Hi Jacqueline! | Do these joints that you're having problems with happen to be on fine pitch solder joints? Are the fillets staying attached to the foot and separating from the pads cleanly? | If that is true, are there many vias concentrated
Electronics Forum | Mon Sep 14 07:19:34 EDT 1998 | Wayne Bracy
DB Sure, it is always possible to "duck in outside air" to use with production equipment, but be careful, you have to determine the air quality required for your process. Cosnsider moisture, contaminates and the actual forcing of air into a confine
Electronics Forum | Sat Sep 12 20:34:05 EDT 1998 | Rick Bell
| | | I was wanting to know if double sided reflow can be done with a metal plated BGA on topside. We would be running bottom side first. My boss seems to think the only way it can be done is by placing glue dots on the bottomside compoents becaus
Electronics Forum | Thu Sep 10 17:38:30 EDT 1998 | Dave F
| I was wanting to know if double sided reflow can be done with a metal plated BGA on topside. We would be running bottom side first. My boss seems to think the only way it can be done is by placing glue dots on the bottomside compoents because the
Electronics Forum | Thu Aug 13 07:53:40 EDT 1998 | Earl Moon
| | Couple of questions. | | 1) Are we talking alumina substrates as the ceramic material? | | 2) Are we co-firing gold as the conductors on the substrate surface? | | 3) In other words, is this a hybrid thick film circuit? | | 4) If so, how large or
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