[. . . ] Before using this unit, carefully read the sections entitled: "USING THE UNIT SAFELY" and "IMPORTANT NOTES. [. . . ] In the case of the symbol at left, it means that the unit must never be disassembled. The specific thing that must be done is indicated by the design contained within the circle. In the case of the symbol at left, it means that the powercord plug must be unplugged from the outlet. Arrange the device carrier and the rack mounting hardware (right) as shown in the figure, and attach at mounting hole A using one of the screws you removed. * In the interest of product improvement, the specifications and/ or appearance of this unit are subject to change without prior notice. Before using this unit, make sure to read the instructions below, and the Setting Manual. In addition to the precautions given in "Using the Unit Safely" in this manual, please also read and observe the following: Do not attempt to repair the unit, or replace parts within it (except when this manual provides specific instructions directing you to do so). When assembling, be careful not to allow fingers or other areas to get pinched. [. . . ] Using screws other than those specified may cause internal damage to the equipment or result in inadequate mounting. [. . . ]