FujiFilm EG-580UR Operation Manual page 63

(7) Press the Lamp button on the light source to turn on the
lamp, and observe the endoscopic image on the monitor.
Check that image is clear and nothing obstructs endoscopic
view.
[Note]
If wiping does not remove cloudiness from objective lens,
it is possible that ultrasonic endoscope is not sufficiently
watertight. Perform air tightness test.
Reprocessing Manual "4.6 Air Tightness Test"
(8) When the inspection is over, press the Lamp button on the
light source to turn off the lamp.
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Chapter 3 Preparation and Inspection Before Use
63