Precautions against Ingress of Metal Fragments

Drilling on the upper section of an installed Power Supply may cause drilling fragments to fall onto the PCB, thereby short circuiting and destroying the internal circuits. Whether the Power Supply cover is attached or not, cover the Power Supply with a sheet to prevent ingress of fragments when performing work on the upper section of the Power Supply.Be sure to remove the sheet covering the Power Supply for machining before power ON so that it does not interfere with heat dissipation.