Electronics Forum | Thu Oct 15 10:26:13 EDT 1998 | Dave Celestian
I have a problem with measling on our PCB's. We saw it on our FR4 PCB's at final assembly yesterday. Is this a defect from the board vendor or something we did in our assembly process when building the PCA's (thru hole). Could the wave solder mach
Electronics Forum | Wed Oct 14 04:01:28 EDT 1998 | Joakim Fagerlund
We have problems with achiveing a void free soldered joint when we seal different kind of packages (QFP,LCC and PGA) We think the problem partly is due to outgasing from the die-adhesive (silver-glass) Does anybody have any reccomendations what to d
Electronics Forum | Tue Oct 13 18:03:40 EDT 1998 | Sanjay Bhatikar
Sirs, What are the issues involved when a stencil printer is used for printing solder paste and adhesive? UV-curing of adhesive appears to help reduce slump and spread by forming a tough skin on the adhesive blob deposited on the PCB. Is th
Electronics Forum | Fri Oct 16 13:11:49 EDT 1998 | Steve A
The Kyzen product was brought to my attention from a chemist at Kester solders when I asked him what could remove no clean residue from a PCB that had been built weeks earlier. We soaked it in the Kyzen for 8 minutes and ran the board through the aq
Electronics Forum | Mon Oct 12 08:07:45 EDT 1998 | Earl Moon
| I have datas to substain that a not wetting PCB ( the HAL oxided or not uniform in thickness )if soldered in reflow, it shows voids with X-Ray inspection.The voids are in side all the joints not only on the solder pads levell. | | Is there a techn
Electronics Forum | Wed Nov 01 13:28:41 EST 2000 | Fraser
Thomas, Dave is right - we had a similar coplanarity problem on some BGAs which we solved simply by over printing - no step required by nearly 2 x what happens is that the paste hight will grow as the paste reflows confined by the pad drop me line a
Electronics Forum | Mon Oct 05 14:51:22 EDT 1998 | Bob Lepianka
Does anyone know of an AOI system that can look at the solder joints of SMT chip devices (1206,0805 & 0603) and make a reliable presence/abscence call of the joint on a HASL PCB. A low false call rate (much less than 1%)is required. Any info. from
Electronics Forum | Mon Sep 28 07:20:49 EDT 1998 | Earl Moon
Does anyone out there have any pictures (jpeg preferred) of solder paste prints - or know where some are available. It will be awhile before our 35mm camera for our 3D scope arrives and I need some for inspection criteria. I need the good, bad, and u
Electronics Forum | Mon Sep 28 10:12:53 EDT 1998 | Chrys
| Hello, | I need some users information about "Air knif" in wave soldering: | 1. Does it decreases bridging ? | 2. Is it self installed of a purchesed kit (if purchesed, who are the recomended vendors) ? | 3. Any other information about the issue. |
Electronics Forum | Sat Sep 26 10:40:50 EDT 1998 | Ajit Jain
Can sombody tell, why the boards soldered with no-clean paste be cleaned at all ! I wants to sop cleaning at our plant but technicaljustification is required to convince my customers in Australia & England. Pl. let me know, from where I can find th
.gif)
