O I S&G Model 2740 Electromechanical Safe Lock
Defense Security Service, Center for Development of Security Excellence http://dssa.dss.mil
4
O L S-U M
O L D-U M
1. Turn dial le (counterclockwise) at least four complete revolutions, then stop
precisely on the rst 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 le 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 nish
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 dierent combinations are needed to open the lock. It does not matter which
combination you enter rst.
1. Turn the dial le (counterclockwise) at least four (4) complete revolutions.
2. Stop precisely on the rst number of the 1st combination.
3. Turn the dial right (clockwise) three times, stopping on the second number of the
rst combination.
4. Turn the dial le two times, stopping on the third number of the rst combination.
5. Turn the dial right about ten numbers. e lock will emit four quick beeps.
Note: e rst combination has been entered. e second (2nd) combination must be
entered within two minutes of the rst combination entry.
6. Turn the dial le four times, stopping on the rst 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 le 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 nish 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.
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