Electronics Forum | Thu Sep 09 10:50:59 EDT 2004 | agkettle
Does anyone have any experience with underfill of HD connectors? New customer wishes to underfill 6 HD connectors that have been pressed into PCB. Capillary action is causing the conformal coat to wick up into connector. Material is acrylic.
Electronics Forum | Tue Sep 21 10:16:28 EDT 2004 | davef
Check with your connector supplier, but most press-fit contacts will pierce through Types UR & XY conformal coat (military approved). Acrylic (AR) Urethane (UR) Epoxy (ER) Silicone (SR) Parylene (XY)
Electronics Forum | Sun Sep 12 08:30:29 EDT 2004 | davef
Well, another alternative is to use a water washable flux. If you insist on staying with a NC flux, use one that is probable. We prefer to probe solder, rather than copper.
Electronics Forum | Mon Sep 13 18:34:31 EDT 2004 | russ
Use Water soluble if you can, if not I would try the Indium SMQ NC paste, this residue stays soft. I would also change ICT probes to the "drill type". Russ
Electronics Forum | Mon Sep 27 11:40:50 EDT 2004 | grayman
use water soluble solder paste is the cure for your problem. but if you insist of using NC change your pogo pins to pointed pins.
Electronics Forum | Tue Sep 14 06:08:46 EDT 2004 | sc
The general control on QFP fine-pitch coplanarity is +3mils. suggest to look at the re-use of thrown out component from SMT machine. If the component pack in std pack, then most probably the lifted is due to processing, not incoming as the packaging
Electronics Forum | Sun Sep 12 21:08:07 EDT 2004 | mksslcheng
Could someone recommend me the manufacuter who is produce Kapton tape or Alum. tape or Epoxy ,I want to profile wave soldering .You would be appreciated if you can provide its website .
Electronics Forum | Wed Sep 15 07:43:11 EDT 2004 | gregoryyork
It may be worth baking the boards for an hour at 120C and then trying it straight away do not leave them lying around.Is the fillet shallow and inverted back into the board. Do you have any blow holes as well? Cheers Greg BLT
Electronics Forum | Fri Sep 17 02:12:16 EDT 2004 | Adam
Rob The machine is SEHO MWS8240, Fitted with a foam fluxer, a combination of IR,Quartz and Convection preheaters together with a chip and delta wave. Adam
Electronics Forum | Fri Sep 17 08:31:01 EDT 2004 | patrickbruneel
Adam, If you use the chipwave on that board, eliminate the chipwave on one board and see if this eliminates the problem with the insufficient solder on the connector. Regards, Patrick
