Yes Not a lead free operation I am running boards and I keep getting solder balls on some of the smaller resistor. Isn't there a process for this or what could I do.
2007-08-13 07:32:58 · 3 answers · asked by fortydogg_2000 1 in Science & Mathematics ➔ Engineering
Is your solder paste old (past its expiration date)?
Is the solder mask for the paste made to the right tolerances?
Is part of the pre-processing of the blank board to the new ROHS standards incompatible with the lead solder paste?
Those are the only things I can think of, because my main area of expertise is not in manufacturing -- I'm mainly a designer/analyst who makes it out to the factory floor occasionally.
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2007-08-13 07:53:26 · answer #1 · answered by tlbs101 7 · 0⤊ 0⤋
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2016-05-17 04:10:18 · answer #2 · answered by sanjuanita 3 · 0⤊ 0⤋
If it is component-specific (one particular set of resistors, say) suspect cleanliness problems on that batch of components and replace them. Most of the time the problem is solder paste related. Try a new batch of solder paste first. If that doesn't solve the problem review your handling procedures, with particular attention to warmup from storage and short, consistent open time between application and reflow.
Has the weather affected the humidity/temperature conditions in you work area?
2007-08-13 07:52:10 · answer #3 · answered by virtualguy92107 7 · 0⤊ 0⤋