1) Lamp replacement   

1.  To replace the bulb in Collimator, the several things are checked whether the bulb is out or the fuse of generator.

2. Open the rear cover as removing the two bolts in the rear cover of Collimator.

3. Check the level of voltage at the two points . Note. If it shows 24VDC between two points, the bulb should be replaced. But if the level of voltage is 0V, the fuse of Generator might be burnt out for some reasons. 

4. Get the bulb out of socket in Collimator

5.When plugging new bulb into socket, be aware that it should be not touched on the halogen bulb with hands directly. It may cause the bulb broken before the predicted product life

5.Close the rear cover with the bolts