Electronics Forum | Fri Oct 03 05:23:21 EDT 2003 | kanwal324
Please check the leads length and polarity. The manf. of LEDs must have given some feature for distinguishing.
Electronics Forum | Tue Feb 07 12:37:43 EST 2006 | Fawad
We are using Semi-automatic PNP machine from Fritsch model SM-902...presently there is a problem with the machine and the production is held up becoz of that...i have tried to contact Fritsch on their website...but they have not replied yet...sorry t
Electronics Forum | Fri May 10 15:02:28 EDT 2013 | dontfeedphils
In my experience, no. There are some uses for angled cameras (I've used them for inspecting off marks like notches out of LEDs for polarity), but I never found the results repeatable enough to warrant using the angled cameras over the standard, stra
Electronics Forum | Tue Aug 20 08:51:58 EDT 2013 | proceng1
I don't know about a poster, but we just print the Data Sheet for parts with questionable polarity markings. Just remember, that not all SMT LEDs are marked by Cathode. We have ONE LED that we use that the manufacturer puts a dot on the anode side.
Electronics Forum | Fri Dec 10 12:40:44 EST 1999 | Brian W.
It sounds like the process is very labor intensive, and all the verification is done after the parts are soldered. Assuming you are hand placing the components: 1 - Contact Systems semi-automatic placement machine. It show polarity when placing, so
Electronics Forum | Fri Dec 10 10:49:24 EST 1999 | Mike F
Some of our boards have over 700 LED's, so looking for the long leads is the most accurate way to check polarity. Also, not all LED's have a flat side and tinted domes can make it difficult to see the internal structure. Auto insertion didn't work, f
Electronics Forum | Thu Dec 09 18:21:20 EST 1999 | Boca
Mike, Russ is right, no 'normal' wave machine will solder PCB's with 1" long lead length. I have seen waves modified to clear up to 5/8" leads, but the deeper the wave the uglier things get. They get uglier in that a lot more dross is produced, con
Electronics Forum | Fri Dec 10 14:49:57 EST 1999 | John Thorup
Hi Mike consider buying your LEDs from a value added distributor or sending the to a service house for trimming. It's no trick to cut so that one lead is longer than the other although you may have to pay a tooling charge. These people are equipped
Electronics Forum | Thu Dec 09 17:29:15 EST 1999 | Russ
Mike, It sounds like you have a serious problem, I don't know much about drag soldering or what your specific soldering problem is with your present supplier. I do know that with a conventional solder machine these leads won't even make it through
Electronics Forum | Tue Aug 01 20:50:03 EDT 2023 | calebcsmt
If it was only 1 or 2 components on a reel that were backwards, I would lean more likely the cause just being the component was wrong direction in Tape from factory. Not much you can do from a Pick & Place perspective, generally.. Most machines use
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