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SMT fine picth connector lead oxidize-Throw out rate too high!

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#70653

SMT fine picth connector lead oxidize-Throw out rate too high! | 4 September, 2013

SMT fine pitch connector having oxidation on lead and P&P machine keep rejecting the part. Is there any alternative way to reduce the part throw out rate without jeopardize the placement accuracy? Or is it possible to re-coat the connector lead or any recommended chemical can be used to clean up the oxidation?

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#70674

SMT fine picth connector lead oxidize-Throw out rate too high! | 5 September, 2013

Questions are: * How did you determine that the coating on your component leads is oxidation? * What is the oxide?

BR, davef

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#70678

SMT fine picth connector lead oxidize-Throw out rate too high! | 5 September, 2013

This connector was designed with gold flash plating and the lead's surface was become dull and some black mark was observed on the contact surface.

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#70685

SMT fine picth connector lead oxidize-Throw out rate too high! | 6 September, 2013

gold, one of the stablest elements on the periodic table oxidising. Are you sure, and why would you want to reduce the vision fail rate on a part that is clearly shockingly poor?

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#70700

SMT fine picth connector lead oxidize-Throw out rate too high! | 6 September, 2013

If you are a CEM you are setting yourself up for failure and will be left holding the bag. Flash gold has one purpose. It is a protective coating for the base medal to keep it from oxidizing. It is very thin and will be absorbed into the solder joint. As far as connectors go flash gold would not be a recommended process for the actual contact surface unless it's a one time plug and play and the assembly is disposable if it failed. Gold flash plating as used in the manufacturing process of the connector is not a real process, as gold flash and gold plating are apples and oranges. Just some advise, take it or leave it.

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#71005

SMT fine picth connector lead oxidize-Throw out rate too high! | 20 September, 2013

> gold, one of the stablest elements on the > periodic table oxidising. Are you sure, and why > would you want to reduce the vision fail rate on > a part that is clearly shockingly poor?

Old inventory is holding a huge material cost and if i can find a way to deplete this batch of connector, it might save a lot from scrapping the old inventory. The solderability test already been passed. Just a problem of SMT P&P machine is keep rejecting the part due to vision failure..

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#71053

SMT fine picth connector lead oxidize-Throw out rate too high! | 23 September, 2013

On machines such as MyDatas you have the ability to mechanically center parts rather than optically centering. If your machine is capable of doing mechanical centering that would eliminate the need for the vision analysis. -Joe

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#71064

SMT fine picth connector lead oxidize-Throw out rate too high! | 24 September, 2013

Hi Joe, first of all thanks for your input. I did tried to search for the Mydata brochure and found that they are using Lifescan Vision System (LVS) which i think should be vision analysis. Appreciate if you can explain more in detail how's the mechanically centering works? BTW, my contract manufacturing is using XPS SMT machine.

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#71069

SMT fine picth connector lead oxidize-Throw out rate too high! | 24 September, 2013

The mechanical centering is used for testing resistors, caps, and other various components. It is also used to center parts by "tapping" them with a set of jaws. When the head picks up the component, it is between these jaws. Each part is setup to be centered in one way or another. Some parts used the LVS (Linescan vision system) or using one of the other cameras visually or they can be setup to be centered with the jaws. The programmer of the part/package then sets up parameters such as dimensions of the component for the jaws to test. Hope this helps!

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#71110

SMT fine picth connector lead oxidize-Throw out rate too high! | 26 September, 2013

Thanks Joe. I will check through this with machine supplier to understand what's their machine's ability of doing this.

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