Electronics Forum | Wed Oct 17 09:08:48 EDT 2001 | hany_khoga
Dear all: Does anyone know if there is any significance of the small numbers on SOT's. Do they have a special standards. For example I have one with just(A4), can this tell me any useful information? Thankyou. Hany
Electronics Forum | Tue Jan 31 03:34:50 EST 2006 | chadnugent79
If you are sure that your part data is correct, have you checked the calibration of Z origin? Are the parts leaving an impression on the paste or is there no indication of an attempted place. How small of resistors are we talking 0402, 0603, 0805?
Electronics Forum | Sun Feb 10 16:35:06 EST 2008 | neocera
Hi, I have a PCB with a blown PMIC (power management integrated circuit) multi voltage regulator IC. The PCB is rather rare and I need to replace the PMIC, its footprint is 7mm X 7mm with 12 solder points per side. Unfortunately I can only solder th
Electronics Forum | Mon Dec 06 12:33:49 EST 1999 | Wolfgang Busko
Hi Glen, is it a wavesoldering or reflow problem ? Check the difference between the boards that show this symptom and those that doesn�t. Are there differences in the material, the handling, the processes, pitches etc. Looking at that should help you
Electronics Forum | Tue Jan 31 02:59:18 EST 2006 | jgarver1
You also should check to make sure you have blow off at the placing station set properly. I have seen machines with the flow control valve shut completely off not release parts properly. The parts end up in the scrap bin and the machine thinks they
Electronics Forum | Sun Feb 10 20:27:50 EST 2008 | jmelson
As long as it doesn't have a thermal pad soldered under the package, it shouldn't be a big problem. Small, pointed iron, stereo zoom microscope if you can find one, or a head-mounted magnifier. Lots of light. Rest the heel of your hand on the boar
Electronics Forum | Mon Dec 06 06:06:44 EST 1999 | Glen brian
Recently, my plant met the problem of bridging, a metallic link, lying on the solder mask and joining nearby joints. It is very diffcult to observe by our inspector and may be only discovered with ICT testing. This defect ocurrs randomly around the
Electronics Forum | Mon Dec 06 09:28:11 EST 1999 | Dave F
Glen: So that's this metal? Is it in the area of PTH or SMT solder connections? Etc, Etc. Assuming its near connections where pasted is reflowed ... Reflow defects, bridging: misplaced components, high placement force mushrooms paste, too much p
Electronics Forum | Thu Dec 09 04:53:36 EST 1999 | Glen brain
Hi, It is wavesoldering defect, in single- sided copper board, using alcohol-based rosin flux. It is not a bridging between the protruding leads but a metallic (I think, it is solder) link, varies in dia./thickness, connected the basement of solde
Electronics Forum | Tue Dec 14 12:41:56 EST 1999 | Kris W
Glen, Although the previous answers probably fit the problem you are having, we recently found that during pin insertion on an Autosplice machine, the gold was flaking from the pins and lodging between the legs of surface mount components. It would
