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May 1997

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Wed, 21 May 1997 15:23:53 -0400
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>From bergdi Wed May 21 14:
11:52 1997
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From [log in to unmask] Wed May 21 14:
17:27 1997
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Subject:
Solder balls
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sam mccorkel <[log in to unmask]>
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We're having problems with "solder balls" that are "resting in a nest". We
have .025" via holes that are covered with L.P.I. soldermask. The mask is
collapsing when going through our vertical hot air leveler and little
"solder balls" are sitting just inside the holes. The solder balls are
falling out at subsequent operations and in some cases are ending up between
contact fingers that have .006" spacing between. The solder balls are
creating a short at electrical test. They are easily removed but not easily
detected before hand. Any ideas on what we can do to eliminate this problem?

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