8
(2)
short circuit
：
When the ball reached the melting point,it is in a liquid state , if too long or too high temperature
and pressure,it will destroy surface tension of solder balls and the supporting role, resulting in
short-circuit phenomenon when reflows,the chips fall entirely on the PCB pads the , so we need to
appropriately reduce the heating section of the third and fourth soldering temperature and time , or
reduce the bottom of the preheat temperature.
Note: In normal use rework station it will produce small quantities of bad
smelly, in order to ensure comfortable, safe and healthy operating
environment, please keep indoor and outdoor air flow.
