Operating Instructions
S&G Model 2740 Electromechanical Safe Lock
Defense Security Service, Center for Development of Security Excellence http://dssa.dss.mil
4
Opening the Lock in Single-User Mode
Opening the Lock in Dual-User Mode
1. Turn dial left (counterclockwise) at least four complete revolutions, then stop
precisely on the first number of the combination.
2. Turn the dial right (clockwise) three times, stopping when the second number of
the combination comes into view during the third rotation.
3. Turn the dial left two times, stopping when the third combination number comes
into view during the second rotation.
4. Turn the dial to the right approximately one and a half (1.5) times. If you have
entered your combination correctly, the dial will come to a stop before you finish
the 1.5 revolutions.
Note: If you overshoot, continue rotating the dial in the same direction for an extra
turn, then stop precisely on the desired number.
Note: Two different combinations are needed to open the lock. It does not matter which
combination you enter first.
1. Turn the dial left (counterclockwise) at least four (4) complete revolutions.
2. Stop precisely on the first number of the 1
st
combination.
3. Turn the dial right (clockwise) three times, stopping on the second number of the
first combination.
4. Turn the dial left two times, stopping on the third number of the first combination.
5. Turn the dial right about ten numbers. The lock will emit four quick beeps.
Note: The first combination has been entered. The second (2
nd
) combination must be
entered within two minutes of the first combination entry.
6. Turn the dial left four times, stopping on the first number of the second
combination.
7. Turn the dial right three times, stopping on the second number of the second
combination.
8. Turn the dial left two times, stopping on the third number of the second
combination.
9.
Turn the dial right one and a half times. If the two combinations have been entered
correctly, the dial will come to a positive stop before you finish the revolutions.
Note: If either of the two combinations have not been dialed correctly, the lock will emit
a brap. Go back to Step 1 and begin again.
If you overshoot, continue rotating the dial in the same direction for an extra
turn, then stop precisely on the desired number.
