key does not unlock

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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 to r...
 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 7500 mortise lock should be configured for NL function as shipped not as Classroom. See figure 4-3 in E996L instructions.
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...