Troubleshooting the Stencil Printing Process - SMTA

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Phase Shift InterferometryShines a grated light on <strong>the</strong> subject– Called a Moire pattern– Pattern appears to move as it crossestopography– Like afternoon sunlight shining through blindsTakes photos at known angles– Calculates height by changes inpattern at different angles– Extremely accurate andrepeatable– Used in all types of surfacemeasurements
PSI and Solder Paste“Chops” each deposit into tiny segments – as small as 10 µmCalculates height volume of each segmentCompiles data for each deposit and returns:– Area– Height– Volume– Offsets in X and Y– Solid Model
Page 1 and 2: Troubleshooting the StencilPrinting
Page 3 and 4: Solder Paste Properties• Solder p
Page 5 and 6: PWBPads: Flat, RightSize, Free of D
Page 7 and 8: Solder PasteFormulation, Rheology,
Page 9 and 10: A Good Mechanical Setup isEssential
Page 11 and 12: Stencil SeparationIf printer has st
Page 13 and 14: Results16-mil pitch QFP
Page 15: Preventing The Bad and The Uglywith
Page 19 and 20: Process ControlWith Automatic Solde
Page 21 and 22: Still Making Defects?Check the easi
Page 23 and 24: Check the ToolingNext: Remove the s
Page 25 and 26: Didn’t find the Root Cause?Time t
Page 27 and 28: Solder Bridges
Page 29 and 30: Poor Print DefinitionPeaks and “D
Page 31 and 32: InsufficientsPoor Aperture FillBonu
Page 33 and 34: InsufficientsPoor Aperture Release
Page 35 and 36: Poor Gasketing
Page 37 and 38: Poor Alignment
Page 39 and 40: Summary - Troubleshooting• Unders
Page 41: Questions?Contact Chrys at:chrys@sh

Troubleshooting the Stencil Printing Process - SMTA

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