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Mon, 19 May 97 11:21:32 -0500 |
| From [log in to unmask] Mon May 19 15: |
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| >From bergdi Mon May 19 11: |
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Stella:
Sounds like you have moisture in your fixtures. What type solder
machine do you have, type preheat, and preheat length? Preheat
capability is essential to remove all moisture off the assembly, plus
the fixturing. Otherwise you will experience spattering when the
moisture contacts the wave. These mini-explosions can force
solderballs through whatever opening are available.
You may want to recheck your profile at a slower conveyor speed to dry
the fixture as well as the circuit card assembly (CCA) you are trying
to solder. Don't forget that changing your conveyor speed, you need
to change preheat profiles and check quality characteristics of your
CCA.
Just some thoughts, hope it helps.
Ron
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