Electronics Forum | Mon Dec 03 15:03:49 EST 2018 | dleeper
I can't open your spread sheet to see how you calculate this, but usually this sort of calculation assumes the leads are spaced symmetrically on both sides of the part and the center of mass is between them. Gravity pulls the part down, while the wet
Electronics Forum | Mon Feb 02 05:08:37 EST 2004 | heccles
Anybody seen problems with potted trimpots and reflow soldering - specifically poor wetting as a consequence of lead contamination from the potting compound. Regardless of reflow profile used (MIL -STD -202) cannot get a good joint formed ! If you us
Electronics Forum | Tue May 10 12:12:42 EDT 2005 | dougt
We had an outside vendor that built a particular board for us. When there were problems with the new board 9 times out of 10 the case of the oscillator was shorted to the lead as mentioned in the post above. The fix would be to draw some of the sol
Electronics Forum | Wed Jul 05 02:56:25 EDT 2006 | bvdb
Thanks Grant and Doug, The manuals never tell you that you can pull the leadscrew covers back - but thanks to your suggestion I was able to access the lead-screw. It didn't look bad at all and had some lubrication on it. I added some more lubricat
Electronics Forum | Tue Feb 24 16:39:28 EST 2009 | swag
We have to be careful with the cooling zone in our oven (especially lead-free recipes) as the cooling rate is much too high with the fan above its lowest setting. Depending on the design of your oven, it's also possible to pull a lot of heat out of
Electronics Forum | Thu Apr 11 11:06:27 EDT 2013 | ericrr
1) I think maybe not, however having said that, our conveyor does not work between the final placement machine and the oven, in the early days before I became a "experienced" operator in pulling the board out of machine running it along the track to
Electronics Forum | Sun Feb 03 08:46:34 EST 2019 | dfl
SOLVED The LED/phototransistor was a little of the center on the "index wheel" (don't know a better name, its the gear that pulls the component strip). The wheel works with a LED from one side and a phototransistor from the other, through a hole on
Electronics Forum | Wed Dec 11 16:46:25 EST 2019 | stephendo
From what I understand when ROHS was first implemented the EU planned on testing products. But the EU economy would have shut down if all the physically non-compliant products were pulled. And now it is more showing due diligence. Remember it is poli
Electronics Forum | Tue Apr 11 16:42:56 EDT 2000 | Chad Notebaert
I�m thinking �Poor intermatallic� It could be a few things. Lets start at the beginning. -Is your paste a 63/37 mixture? -Have you monitored you screen printing, Verify Solder deposition, Are you getting enough paste? -You say the solder looks like i
Electronics Forum | Mon Nov 15 14:40:38 EST 1999 | Bob Smith
Hi, I have a problem I've never seen before so I hope someone here can help. A recent batch of PCBs arrived where the copper lands delaminate with a small pull. Normally you have to pull pretty hard and the whole land comes off the substrate. These
