1. Plug in the foot pedal,
2. Turn the power on, brightness is at the lowest point;
3. There are two operating models: with the foot pedal switch model or without model. There is a Dip switch on the right side of the viewer. It will automatically set on the With foot pedal switch model when it is on and in this model you can adjust the dimmer by pressing the foot pedal switch and turning the knob (the preset brightness is 90000Lux) clockwise brightness up and anti-clockwise brightness down; Press the knob once,will shift to thewithoutmodel, you can adjust the dimmer by turning the knob simply.
4. Check the cool-off fan frequently and stop working when it is out of control