Though I have not seen the solderballs prior to
assembly, they do have an impact.  Generally, they move around the board
during reflow and stick where you want them the least.  I.e. gold plated
contacts, etc.  Depending on the pitch of the parts used for assembly,
you may also see shorts.

                Simply cleaning the boards prior to assembly usage takes
care of them and their associated problems.

                Cobey Schmidt
                VisionTek

                                -----Original Message-----
                                From:   Erat, Wolfgang
[SMTP:[log in to unmask]]
                                Sent:   Friday, June 05, 1998 8:56 AM
                                To:     [log in to unmask]
                                Subject:        [TN] SOLDERBALLS on
bareboards

                        Hello Techs

                        Is there a criteria for solderballs at the
bareboard level ? prior to
                        assembly ?
                        Have you seen solderballs from the HASL process
? Would this affect the
                        assembly process or would any solderballs simply
reflow ?

                        Thanks in advance for your input /

                        Wolfgang Erat / QA Manager / Viasystems Canada
                        [log in to unmask]


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