Components Solder Short

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Hi Folk, what is the possible cause for the components (e... - Jul 21, 2006 by CKH

Thinner stencil Russ ... - Jul 21, 2006 by RDR

hot/cold slump, print misregistration ... - Jul 21, 2006 by RFredericks

Paste too thick. Paste not aligned on pad. Part not aligne... - Jul 21, 2006 by

- Dirty stencil transfering paste from the stencil bottom. ... - Jul 24, 2006 by nodlac

It could be an over-zealous operator moving the IC with twee... - Jul 24, 2006 by Samir Nagheenanajar

Set-down height to low, iow, parts getting squashed too deep... - Jul 24, 2006 by Steve Thomas

CKH

#42868

Components Solder Short | 21 July, 2006

Hi Folk,

what is the possible cause for the components (e.g ICs) to be Solder shorted? I know that one of the cause is the solder paste height is too thicked. Could anyone advise me on then possible root cause and solution(to minimize the rate of solder short) to this.

Thks & Warmest Rdgs CKH

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RDR

#42877

Components Solder Short | 21 July, 2006

Thinner stencil

Russ

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RFredericks

#42879

Components Solder Short | 21 July, 2006

hot/cold slump, print misregistration

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Chunks

#42881

Components Solder Short | 21 July, 2006

Paste too thick. Paste not aligned on pad. Part not aligned on pads. Part leads not straight. Oven profile. Paste slump from warm board. Operator before oven thinks they can place IC better than placement machine - so plays IC hockey with part. Oven conveyor not smooth.

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nodlac

#42909

Components Solder Short | 24 July, 2006

- Dirty stencil transfering paste from the stencil bottom. - Stencil opening (Pad Hole) to pad ratio incorrect - too large -misaligned stencil

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Samir Nagheenanajar

#42910

Components Solder Short | 24 July, 2006

It could be an over-zealous operator moving the IC with tweezers before reflow oven.

Have a splendid day!

-Samir