Key does not lock

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The Von Duprin 7500 mortise lock body ships in the NL mode.  Either the function of 7500 lock body has not been changed to the Classroom function or the NL Drive screw is not all the way down. Step...
  Tips for changing the function: The NL Drive screw will not be visible when lock body is set to Classroom function There is locktite on the screw that makes it seem like its turned down enou...
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...
T381 Classroom Security Lock is not a "true" classroom security / Intruder lock function. The T381 is classified as a ANSI/BHMA F88 function: Defined as Grade 1, Apartment, Exit or Public Toil...
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...
The keycam may have failed, example here, the latest design keycam can be easily identified as the colored changed to black. Replace either the keycam or chassis as needed...
 This could also happen if the tailpiece isn't installed in a KIL, FSIC, or SFIC cylinder.  The FSIC driver also could have come loose from the core in the spindle.
The AL53 and ND53 is not designed to be locked from the outside with a key. Key operation: When the button is pushed then the key will unlock the outside lever. When the button is pushed and...
The 7500 mortise lock should be configured for NL function as shipped not as Classroom. See figure 4-3 in E996L instructions.
The L9466 Store/Utility Room lock can provide this functionality. Operation: Latchbolt retracted by knob/lever either side. Deadbolt thrown or retracted by key from either side. When the deadbolt ...
When you want to periodically disable and block access to a certain room in a building or an entrance door, that’s when you would need to use a Lockout Cylinder. See full document.