Hello teachers,

we have the following problem in some class 3 units: we have detected a
white stuff inside the contacts of female connectors. It could be the main
cause of the failures found during testing. Our thought is this substance
could be due to a reaction between the rosin flux used when soldered the
connectors whit the cleaning solvent (IPA)

Two questions:

1) Could you recommend a solvent to remove these residues. We have tried
with 141-b, but it could damage some parts of the unit.

2) We would like to send a contaminated connector to a lab for analisys.
Could you recommend a technique to determine these substances?

Thank you for your help.

Juan T. Marugán
Indra Sistemas SA
España

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