Profile: QES Limited is a repair and engineering services business. We specialize in electronic power conversion equipment (power supplies) as well as producing and repairing our own products. We repair power supplies made by any other manufacturers also. We provide single sided pcb containing around 70 component parts on a surface area of approximately 30 x 60 mm. This piece was designed as a replacement for an existing circuit board. It employs the original circuit updated to accommodate new parts to replace obsolete and outdated parts.