Electronics Forum | Thu Nov 04 19:51:28 EST 1999 | John
Thanks folks. The current vendor is doing an alcohol wash, top and bottom, then performing an ionic test on 100 boards. I'm not to confident in the testing because the readings for a "clean" board are 25 ugm/sq in and a "dirty" board are 40 ugm/sq in
Electronics Forum | Fri Oct 29 02:07:48 EDT 1999 | Eom In Soub
hi. guys Have you out there ever seen the crack by means of humidity after reflow solering. We cannot analyze the cause of the tsop crack. The shape of crack seem to be hitted by sharp stuff. but there is no scar around crack . TSOP shaped long rec
Electronics Forum | Thu Oct 28 18:14:51 EDT 1999 | John Thorup
Try looking for paste contamination somewhere. Dirty stencil, printer table or fixtures. Placement table/fixtures. Reflow belt/conveyer. Reuseable finger covers, if used. Try covering the fingers with Kapton tape during different stages of the proc
Electronics Forum | Wed Oct 27 16:58:19 EDT 1999 | hany a. salam
Hello there: Currently we are building our own facility for producing electronic assemblies. I had a long discussion with my colleagues concerning the ESD mats surrounding the sensitive components areas such as the pick & place machine
Electronics Forum | Wed Oct 27 16:58:13 EDT 1999 | hany a. salam
Hello there: Currently we are building our own facility for producing electronic assemblies. I had a long discussion with my colleagues concerning the ESD mats surrounding the sensitive components areas such as the pick & place machine
Electronics Forum | Thu Oct 21 10:21:54 EDT 1999 | Brian
Cliff A half-question/half suggestion. In the thread about whether gloves are necessary on the SMT forum, I replied but, because I considered that the subject is much more far-reaching than the original poster thought, I ticked other forums, as well
Electronics Forum | Wed Oct 20 05:13:24 EDT 1999 | Paul Gerits
Hi Jorge, As you know SMEMA is a world standard (means it is the same at every vendor and each machine), at DEK you can buy (if not already implemented in your printer) SMEMA communication option. This is a pcb which is set in the machine to enable
Electronics Forum | Thu Oct 21 10:13:19 EDT 1999 | Bill Bannister
The Brady PAM 5000 may work for you as well. I think they have a web site. This machine is smema compatible. It's automatically places barcode labels onto pcb's within an 18"x22" area with .020" accuracy. The labels can be placed at 0 or 90 deg onto
Electronics Forum | Mon Oct 18 20:06:27 EDT 1999 | Phuc Nguyen
I am researching a process call Collumn Grid Array for the BGA. Please email me if you have some knowledge about this process. The problem is ceramic BGA has different thermal coefficient with PCB (FR-4) material, and in extreme temperature (-40 C-
Electronics Forum | Thu Oct 14 09:05:17 EDT 1999 | Brian
Nancy, Cliff, There are pros and cons. Some of the longer threads take an age and a day to download when the server is busy, if everything is intact since the birth of Adam. Personally, I prefer it as is because I'm damn lazy and hate scrolling down
