Topcon SL-2G Slit Lamp: No light issue

If nothing comes on when you turn on your 2G. (Make sure you are plugged in.☺) It could be one of these 3 components: Power Supply 15VDC #4462860010 LED control PCB #4462825200 LED unit #4462825100 Make sure you are reading 15volts DC out of your power supply. The external led indicator should light up amber/yellow when plugged in, and turn green when the rheostat is turned on. If green, and no light, make sure your slit width is open and diaphragm is on the largest diaphragm and the filter lever is on a color. If still no light, make sure the LED cable is plugged in to the PCB board and is not damaged. If still no light it could be your LED unit. You can verify if you have a spare LED to test it. I hope you resolve it! ☺