Turn the mode selector switch to O (OFF).2. Rotate the suction control knob a phútimum of two full turns in the clockwise direction (increase suction) to ensure its setting is not at the off position.3. Occlude the patient port of the suction regulator.4. Observe the suction gauge, the needle should not move.5. Rotate the suction control knob fully counterclockwise to ensure its setting is at the fully off position.6. Turn the mode selector switch to I (ON).7. Observe the suction gauge, the needle should not move
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