ND-YAG Laser is a Permanent tattoo removal is achieved using the Spectra Laser which directs concentrated laser energy to carefully break down the inks of a tattoo into tiny fragments without damaging the surrounding skin, allowing the body to naturally dispose of the tiny ink particles. Although not immediate and often requiring repeated treatments, the process is meant to be permanent and usually yields results with less chance of scarring. The trainer is designed to demonstrate the operation, theory, repair and servicing of ND-YAG Laser equipment that used at clinics & hospitals. The unit given the fault diagnosis so as to facilitate the teaching of trouble shooting techniques. A fault simulator is provided with circuit block diagram of the device for the students to study theoretically and experimentally in order to understand the operation of the device.