key wont turn lever

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The 7500 mortise lock should be configured for NL function as shipped not as Classroom. See figure 4-3 in E996L instructions.
The lever may be missing the slot feature for the core locking lug.  Verify slot is in place.
The 98/99 rim and vertical rod exit devices are shipped with NL drive screw to function as a Night Latch. To convert the device to Class Room, remove the NL Drive Screw on 98/99 center case ass...
It is not possible to key SFIC and standard cylinders including Schlage FSIC into the same system.  A keyway name may be shared between the two key fami...
Indicator not extended Indicator extended
The indicator on a cylindrical hotel lock is a small pin that projects outward from the face of the cylinder plug (Figure 1) when the inside push button is depressed.  When this pin is pr...
Conventional Cylinders - A conventional cylinder is one that requires some breakdown of the lock in order to be removed. These are the most commonly used cylinders sometimes called key-in-lever...
When CX99L-BE is not armed with key cylinder on the device or shunted by card reader, the exterior 996LBE lever trim will release.
To convert the Von Duprin 9975NL(Night Latch or Storeroom) to 9975L (Classroom) exit function follow these steps (Note: the mortise lock is shipped as Night Latch from the factory): Turn the NL ...
To convert the Von Duprin 9975L to 9975NL exit function follow these steps (Note: the mortise lock is shipped as Night Latch from the factory): Turn the NL screw on 7500 mortise lock counter clo...