How do I switch the ML90-M mortise leverset between fail-safe and fail-secure modes?

[DeKarter]

To change the operational mode of your ML90-M Series Electric Pullback Latch Passage Mortise Leverset from fail safe to fail secure, or vice versa, follow these simple steps: First, remove the two Phillips head screws that secure the faceplate or armor front of the lock. Next, locate the EU/EL switch inside the deadbolt cavity. Position this switch to select your desired function. If you want fail secure operation (outside lever locked without power), set the switch to EU. For fail safe operation (outside lever unlocked without power), set the switch to EL. Note that you don't need to apply power during the switch adjustment. The lock will change to your selected function the next time power is applied. After setting the switch, apply power through your access control system. Press and hold the momentary power button until you hear the motor activate, which should take about five seconds. Finally, test the lock to confirm it's operating in the desired mode, and then re-install the two Phillips head screws to secure the faceplate. This process ensures your ML90-M leverset functions according to your specific security needs.