Electronics Forum | Wed Feb 21 14:52:36 EST 2007 | wavemasterlarry
Put a wieght on it.
Electronics Forum | Sat Feb 17 14:21:54 EST 2007 | Muhammad Haris
Hi All, I am using YV100Xg YAMAHA Pick and Place Mounter Machine and I am facing a tilting problem of PLCC 84 and QFP 240 pins ICs. I deeply checked about their vision files and place them on the double sided tape and found them ACCURATE on their pad
Electronics Forum | Mon Feb 19 07:31:43 EST 2007 | jax
Check the nozzle. If these are the only two parts on the board that use a specific nozzle, it's a good place to start. The nozzle is probably not releasing well and shifting the component when trying to retract after placement...
Electronics Forum | Mon Feb 19 08:38:05 EST 2007 | realchunks
Are your pads on the board aligned correctly? I've seen this a lot lately. Pads on opposite sides are not aligned correctly. This causes the part to twist. If you have the Gerber and a way to check it, it's worth the 3 minutes to check.
Electronics Forum | Tue Feb 20 23:46:38 EST 2007 | Muhammad Haris
hi Jax the nozzle which i am using for these components are also used for large SOPs and other components so i cant blame my nozzles.The problem is, they always shift to some 5 degree plus but some times it place them accurately.
Electronics Forum | Tue Feb 20 18:04:53 EST 2007 | coop
I am not familiar with the YV100XG pick & place but you might want to increase the mount height of these components The double stick tape isn't as thick solder paste. it might be pushing the component too far down causing it to twist. I encountered
Electronics Forum | Fri Mar 23 18:55:30 EST 2001 | davef
Consider posting actual measurements of your pads, component leads, and apertures.
Electronics Forum | Thu Mar 22 15:44:50 EST 2001 | pteerink
I have a board with QFP240 plastic package exhibiting the same characteristics. Minimum heel fillet that doesn't change with stencil mods, paste change, profile change etc ( I am working to class 2, though, so my pass spec, although they are not pret
Electronics Forum | Thu Mar 22 15:45:20 EST 2001 | pteerink
I have a board with QFP240 plastic package exhibiting the same characteristics. Minimum heel fillet that doesn't change with stencil mods, paste change, profile change etc ( I am working to class 2, though, so mine pass spec, although they are not pr
Electronics Forum | Thu Mar 22 16:06:22 EST 2001 | dblsixes
Our next plan of attack is to dog-bone the solder aperature. By reducing the width of the solder paste at the heel, we hope to slow the flow up the leg of the pin while the temperature of the pad catches up. We have boards that were HASL ...
