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Cover surface mount pads with solder. Try to keep the amount of solder relatively low and equal height on all the pads.
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Add some soldering flux onto pads.
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Place connector on the pads.
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Start heating the connector with hot air. Make sure to move the hot air nozzle around above the connector to heat it evenly. Try with the temperature around 300 - 350 degrees.
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When the solder has melted the connector should drop closer to the PCB. Keep heating the connector for a little longer to make sure that all the solder has melted.
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Let the solder cool a bit.
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Inspect solder joints under the microscope. If any of the pins are not connected, it might be possible to solder them with a soldering iron. Otherwise it might be easier to desolder the connector with hot air and try the procedure from the start.
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Solder the through hole pads with a soldering iron. Be careful not to get any solder into the connector.
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Clean the PCB in the ultrasonic cleaner.