Printed Circuit Board Assembly & PCB Design SMT Electronics Assembly Manufacturing Forum

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SMT electronics assembly manufacturing forum.


PLCC 44 and QFP 240 tilting problems

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Muhammad Haris

#47779

PLCC 44 and QFP 240 tilting problems | 17 February, 2007

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 pads, but whenever i place them on the PCB with the solder paste they twist in different angles towards west SO I HAVE TO PUT THEM ON THEIR PADS THROUGH TWIZER OR PIN TOOLS AND THEN PUT THEM IN THE REFLOW OVEN. How can i solve this problem because small ics and other components have no tilting problem ?

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JAX

#47801

PLCC 44 and QFP 240 tilting problems | 19 February, 2007

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...

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#47805

PLCC 44 and QFP 240 tilting problems | 19 February, 2007

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.

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coop

#47850

PLCC 44 and QFP 240 tilting problems | 20 February, 2007

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 a similar problem with our topaz and a 976 Ball BGA....If this don't help than good luck!!

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Muhammad Haris

#47856

PLCC 44 and QFP 240 tilting problems | 20 February, 2007

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.

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#47876

PLCC 44 and QFP 240 tilting problems | 21 February, 2007

Put a wieght on it.

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