Wuhan Raycus Fiber Laser Technologies Co., LtdUser Guide RFL-A2000D-3000D Ver.1.05CAUTION: Failure to use the correct voltage could damage theproduct.(3) There are no operator serviceable parts inside. To prevent electrical shock, do not try toremove covers. Any tampering with the product will void the warranty.1.5 Other Safety Rules(1) Never look into the laser output head when power is supplied to the laser.(2) Avoid using the laser in a dim or darkened environment.(3) If this device is used in a manner not specified in this document, the protection provided bythe device may be impaired and the warranty will be voided.(4) Do not remove the covers of the laser, or the warranty will be voided. All maintenance mustbe performed in Raycus or by qualified Raycus personnel.