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As locksmiths, our customer/employers expect us to provide service for their locks and door hardware. We need to know how to change the combination or service all kinds of mechanical and electromechanical locks.
The Simplex 900 Series by Kaba Access Control is a pushbutton mechanical lock that has been produced for many years. It is available in a number of configurations including deadbolt and deadlocking latch. These pushbutton locks can be programmed to unlock when pressing one button or a sequence of up to all five buttons. In addition, two or more buttons can be pressed at the same time. However, each button can only be used once in a combination. The 900 Series has been installed mainly in light commercial and residential applications.
Easily identifiable, the Simplex 900 Series locks are equipped with five exterior pushbuttons arranged in a circular pattern. The numbers are indicated by roman numerals (I, II, III, IV V) positioned around the pushbuttons on the faceplate. The outside thumbturn, which is used to retract and to extend the latch or bolt, is located either above or below the pushbuttons depending upon the hand of the door.
Rotating the outside thumbturn clockwise retracts the latch or bolt once the correct combination has been entered. 900 Series locks are equipped with a friction clutch mechanism that prevents forced rotation of the outside thumbturn from retracting the latch or bolt. Should the thumbturn be force rotated, it can be returned to the operating position without damaging the lock by turning the thumbturn until it snaps back into place.
When the outside thumbturn is rotated counterclockwise, the combination chamber is cleared and ready for the combination to be entered. If the 900 Series is a deadbolt configuration, rotating the outside thumbturn counterclockwise also extends the bolt. The outside thumbturn is spring-loaded and will turn back to the vertical position once released.
Note: The Simplex1000 and 5000 Series evolved from the 900 Series mechanical pushbutton locks using its mechanical chamber. Although the arrangement of the pushbuttons is different, the pushbutton positions in the 1000/5000 series are vertical, the combination chambers that are the locking mechanisms are programmed using similar instructions.
Changing the known combination of a Simplex 900 Series mechanical pushbutton lock is accomplished with the lock remaining attached to the door.
IMPORTANT: Keep the door open when changing the combination to prevent locking the door.
Step 1 . Turn the outside thumbturn counterclockwise (to the left) until it stops. Then release the thumbturn. This clears any entries from combination chamber.
Turning a deadbolt -equipped 900 Series lock not only clears the combination chamber, but it also extends the bolt. This is why you keep the door open when changing the combination.
Step 2 . Enter the combination. If the combination is unknown, first try the factory default combination. Momentarily press buttons II and IV simultaneously, then momentarily press button III. There should be a slight resistance when each button is pressed. If that does not work because the combination has been changed, see instructions for clearing a lost combination.
Simplex 900 Series locks are equipped with a screw on the top or bottom of the lock housing located on the interior side of the door. Behind this screw is the internal lockout slide that can reset the combination chamber once the correct combination has been entered.
Step 3 . Use the included 1/8” hex wrench and remove the screw.
Step 4 . Slide the long end of the hex wrench into the opening and press the internal lockout slide. There should be a slight click when the slide moves. Do not force the slide to move.
Step 5 . Remove the hex wrench from the lock housing.
Step 6 . Turn the outside thumbturn counterclockwise until it stops, then release.
Step 7 . Enter the new combination. A slight click should be heard when each button is pressed. Remember that each button can only be used once, and two or more buttons can be pressed simultaneously.
We will install, change the combination, clear a lost combination, and troubleshoot some common problems on this workhorse of a pushbutton lock.
Time to Install: 15 to 30 minutes Necessary Tools: 1-3/16” bit...
These locks protect classrooms because the teacher is able to lock the exterior trim without leaving the interior of the classroom.