... X-ray tube:Cu target, anode-grounding, fan cooling;Tube voltage: 30KVPTube current: 0~5mA, adjusted successively ... high voltage transformer, magnifying, digital counter, air pump , cooling fan , x-ray tube.4.2. The tube ... of orientation unit is horizontal and the cover is on the top , Easy to replace the x ... brightness of filament should change. (2) The cooling fan should work and make voice.(3) Switch ...