adj. 1  wide; of great breadth:The Mississippi River is its broadest at this point. [ 2 after a noun of measurement] measured from side to side: three feet broad. 3  open; full;  not limited or narrow; extensive:Our teacher has a broad range of 1  interests. [before a noun] general: in the broad sense of the term.  plain or clear;
To replace the relay bord you have to uninstall the entire oven and remove the screws coming in from the top panel. Remove the top panel and then you'll see the relay board and you ca replace it. There is no way to jsut replace the relay control board from the front.
In the final step for surface mount led soldering to a circuit board, the boards are passed through a reflow oven, where the temperature will normally reach in excess of 200 degrees Celsius. As the boards pass through the oven and reach the peak oven temperature, the solder paste will begin to reflow.