I am having a lot of tombstoning with  1206 plastic film capacitors
(stack metallized film) part numbers  ECHU1H392JB5 and ECHU1H123JB5 from
Panasonic. Pad design was already checked and it seems alright.  From all the
chips on the board, these are the only ones that  we are having problems with.
Also the oven profile it's OK too (we are using a Unitherm Vitronic convection
oven and Kester 256 no clean solder paste).  One think I noticed it's that the
components seem to be lighter in weight compared to the  ceramic capacitors.
Has anyone had a similar experience? , what can I do to improve the process?.

               Any comments/suggestions. Any information is appreciated.


               Thanks

Jorge Rodriguez
Conexant Systems
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