Electronics Forum | Fri Jun 17 10:06:13 EDT 2005 | Doug
We have had some experience with the immersion tin. The appearance can be "bright" or "dull". Don't discount the fact that it is "bright" doesn't necessarily make it HASL. Furthermore, I personally have never heard of a board manufacturer "stripping
Electronics Forum | Wed Jun 22 11:11:09 EDT 2005 | geb
Thanks for your help. I have resorted to using pads as the PCB doesn't have fids particularly close to the stencils fids. All previous jobs have had fids in the same place on the stencil as the PCB. The printer has a wiper paper which I have set to e
Electronics Forum | Wed Jun 29 17:38:16 EDT 2005 | GS
Several years ago, we had almost same pbm, best results have been obtained by using water soluble paste (those time the old AM1208). Any way, to get a good toe meniscus is not so easy. Talking about CTE, keep in consideration the internal die of TSO
Electronics Forum | Wed Jun 29 17:56:47 EDT 2005 | Ryan
We have a new Heller 1809 EXL reflow oven and when we run MELF�s or Aluminum Electrolytic Capacitors through the oven they are being blown off the pads. I have verified that the placement is good before reflow. I verified that they are pushed down
Electronics Forum | Thu Jul 07 09:53:17 EDT 2005 | PWH
Agree with D.B. We have also had to replace the belt that runs the auto conveyor width function. It might look just fine, but it will skip teeth on occasion if stretched or worn. Reparallelling the conveyor rails can be done manually by skipping t
Electronics Forum | Wed Apr 26 02:16:18 EDT 2006 | AR
We had x-ray and optical microscopy analyses done on transformers dip soldered with Sn/Pb, SN100C3 and SN100C4 alloys using temperatures 400�C ... 450 �C, with dip times of 2..4 seconds. We found that SN100C4 is at least as good as Sn/Pb 62/38 and SN
Electronics Forum | Fri Jul 15 18:21:55 EDT 2005 | dggjr
We have Kester 256 no-clean spec'd as an alternate paste. I bring some 256 in occasionally to make sure it still works as a backup. The last batch I brought in was bridging like crazy. Scraped it off the stencil, put our regular Alpha back down an
Electronics Forum | Thu Jul 14 15:24:55 EDT 2005 | valuems
Thanks pr I know what you mean, and just to let you know, you can turn the over head one off and get one for the center nest. Will be more than glad to tell you how to turn off and turn the center nest one on. And just to tell every one else, were
Electronics Forum | Thu Jul 14 19:12:40 EDT 2005 | sync40
Hi. In the past years I had made dozens of PCBs but now I am trying to get a professional finishing on them. The main problem is oxidation of the copper traces. Basically I use the silkscreen method to make the pattern in both layers and then etch. L
Electronics Forum | Thu Jul 21 22:22:50 EDT 2005 | Ken
Hey, Peter. back in the mid 90's I reversed engineered their drive system because of a dispute over print speed malfunctions. I prooved correct that they had made published claims about their drive topology that were not true. They agreed to redes
