Electronics Forum | Thu Aug 17 17:51:47 EDT 2006 | davef
We use plastic standoffs that fit between the LED and the board. Live well, live long. For more than you wanted to know about standoffs: http://www.reedlink.com/ProductInfo~Productid~158255~ProductName~LED-Standoffs.html
Electronics Forum | Sun Feb 11 08:44:47 EST 2007 | jerry
No, 50 parts on one side and 4 SOIC leds on the other. The LEDs cannot go through the wave so I need to mask them off or cover them up to protect them during the wave.
Electronics Forum | Thu May 03 16:11:08 EDT 2007 | sispace
I found it on white led. It's the gel lens sticking to the nozzle. Instead the yellow/blu/green led's have plastic lens. Use the smallest nozzle possible.
Electronics Forum | Wed Aug 01 19:43:13 EDT 2007 | davef
It's common the heat sink LED. Here's why: http://www.lunaraccents.com/educational-LED-thermal-management.html
Electronics Forum | Tue Sep 04 13:33:55 EDT 2007 | floydf
We "bar" solder them too. (It's really pulsed resistance welding). It's slow but reliable. They seem to be designed for this process. By the way, Luxeon just came out with new LEDs that have nearly the same luminous flux, but that can withstand leadf
Electronics Forum | Wed Oct 22 09:49:22 EDT 2008 | martinwang
please check my company website: http://www.gemmy-tek.com.tw it is a fully automatic hotbar soldering machine, including fluxing, pick & place and hotbar soldering for Lumileds Luxeon LED.
Electronics Forum | Mon Jan 07 09:51:39 EST 2008 | pjc
I have seen the application with hot-bar soldering machines for SOT 23 LED packages. I could not find any of the machines in my search that specially state SOT 23 packages, but you might want to check with these guys: http://www.unitekequipment.com/
Electronics Forum | Thu Aug 21 11:26:45 EDT 2008 | dlabelle
Mild tombstoning on 1206 Kingbright LED. Has anyone seen this problem and have any suggestions in root cause? Please see attachment for more detail
Electronics Forum | Wed Sep 17 08:51:10 EDT 2008 | 18424
We have seen this same defect. Led's not blinking during test and some tops popping off. Ended up being an msd problem. most of the lite-on components are msl level 4-6. We now bake and track them no problems seen in a while.
Electronics Forum | Thu Nov 05 12:48:57 EST 2009 | adlsmt
We have the same problems. We are using Universal equipment. In our case as I suspect in yours its a residue on the LED's not the machine.
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