Soldering and Cleaning
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Contamination can occur in both hand soldering and machine soldering processes. Hand soldering and cleaning are acceptable when performed by properly trained personnel, using small diameter solder (.030-.040 in.) and low wattage soldering irons (25-40 watts maximum). The soldering time should be approximately 3 seconds maximum. Do not immerse or spray the unsealed areas of the switches with cleaners during flux removal.