Operating Instructions
S&G Model 2740 Electromechanical Safe Lock
Defense Security Service, Center for Development of Security Excellence http://dssa.dss.mil
6
Changing the Combination with the Change key
Note: This procedure is used for locks in Single User Mode and Dual User Mode. For
Dual User Mode, each user must change their code independently.
The lock’s combination can be changed by use of the setup module or a separate
change key. Only a safe technician who has successfully completed the factory
approved 2740 training class should connect a setup module to lock.
The change key can be used by a safe custodian or security officer following the
appropriate instructions included in this document.
1. Open the lock using the existing combination(s).
2. With the safe or container open, extend the lock block to the locked position.
3. Insert the change key into the receptacle in the lock cover.
Note: It is now time to enter your current combination again. The lock will emit one
quick beep when you begin.
4. Turn the dial left (counterclockwise) at least four times, then stop precisely on the
first number of your current (old) combination.
5. Turn the dial right (clockwise) three times, stopping on the second number of
your old combination.
6. Turn the dial left two times, stopping on the third number of your old combination.
7. Turn the dial right until you hear three quick beeps.
8. Turn the dial left four times, stopping on the first number of the NEW combination.
9. Turn the dial right three times, stopping on the second number.
10. Turn the dial left two times, stopping on the third number.
11. Turn the dial right until you hear three quick beeps.
Note: The new combination has been entered. It needs to be entered again for verification.
12. Turn the dial left (counterclockwise) four times, stopping on the first number of
the new combination.
13. Turn the dial right (clockwise) three times, stopping on the second number of the
new combination.
