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hi all! i have a 5 zone BTU (V70) have it set up at 120, 1... - Nov 10, 2009 by Nguyen ducThanh

turn off the nitrogen. ... - Nov 10, 2009 by tommyttr

no nitrogen to turn off. ... - Nov 10, 2009 by Nguyen ducThanh

Check out this paper: ... - Nov 10, 2009 by robgd3

try less soak 130 to 225 for lead free : 70-80 sec ... - Nov 11, 2009 by SMT Process Engineer

mail me on s... - Nov 11, 2009 by SMT Process Engineer

download my doc from ... - Nov 11, 2009 by SMT Process Engineer

thanks for all the informations. ... - Nov 11, 2009 by Nguyen ducThanh

Nguyen ducThanh

#60389

oven profile | 10 November, 2009

hi all! i have a 5 zone BTU (V70) have it set up at 120, 150, 180, 190, 230 and 22 IPM. but i having 1 here 1 there 0402 tomstone, need advise how to set up the best profile to avoid tomstone. i'm using INDIUM 6.3 W.S lead paste. thank you.

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tommyttr

#60390

oven profile | 10 November, 2009

turn off the nitrogen.

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Nguyen ducThanh

#60392

oven profile | 10 November, 2009

no nitrogen to turn off.

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robgd3

#60393

oven profile | 10 November, 2009

Check out this paper: http://www.xs4all.nl/~tersted/PDF_files/Plexus/tombstoning.pdf

You can also search the SMTnet archives for more information.

If you're tombstones are random as you describe, likely the problem is not with the profile; but some other factor, ie: center placement, unequal thermal load on either side of the parts, part contamination, or paste volume inequality.

cheers ..rob

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SMT Process Engineer

#60400

oven profile | 11 November, 2009

try less soak 130 to 225 for lead free : 70-80 sec

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SMT Process Engineer

#60402

oven profile | 11 November, 2009

mail me on smtschool@gmail.com i will mail u doc

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