Operations and maintenance personnel are not authorized to remove chassis equipment covers. Only Factory Authorized Service Personnel or other qualified service personnel designated by Avaya may remove equipment covers for internal subassembly or component replacement or any internal adjustment. Service personnel must not replace components with power cable connected unless explicitly directed to do so, such as when replacing a disk drive or power supply. Under certain conditions, dangerous voltages might exist even with the power cable removed. To avoid injuries, such personnel must always disconnect power and discharge circuits before touching components.