53.2. Trial Operation (after checking Troubleshooting Guide)3.2.1. Assembly• Confirm if there is no gap between housing A and B by pinching lead wires.• Confirm that the front cover has been installed so that its edge is aligned with the housing AB groove and that it is not protrudingfrom the groove.• Confirm that the tool’s battery terminal connections are not misshapen, dirty (covered with a thin film), or otherwise in need torepair.3.2.2. Operation• Confirm that the trigger operates properly.• Confirm that the fan’s direction of rotation is correct (counterclockwise) before attaching the front cover.• Confirm that as the trigger is gradually pulled, the fan speed increases smoothly and that the speed of the airflow changes.• Confirm that the tool produces the proper amount of airflow after repair and assembly.3.2.3. Integrity• With the switch activated, shake the tool back and forth and up and down and verify that its sound does not change excessively.• Check for the presence of any dirt or foreign matter from the repair process on the outside of the tool.