A system and method for removing an electronic component from a substrate is described. The surface-engaging sections are each independently linearly movable relative to the moldboard between an extended position and a retracted position to adjust to the contour of the surface being plowed. The invention relates furthermore to a device for exchanging an after loader cartridge in an after loader apparatus according to the invention. Thus, when the pedal is stepped, the propeller shaft is driven to rotate the at least one rotation plate which drives the links to operate the castor units so as to brake or position the castor units simultaneously. The controller opens the openable portion and stops the air-conditioning device when the outside is more favorable in air environment than the inside, and closes the openable portion and starts the air-conditioning device when the inside is more favorable in air environment than the outside.