The S&G
©
2740B Model Electromechanical Safe Lock combines
and simplifies the familiar operation of a mechanical lock with
the advanced security features of a sophisticated electronic
device. Follow these instructions carefully to get the best service
from your lock.
IntroductIon
• The S&G
©
Model 2740B Electromechanical Safe Lock is
shipped from the factory in single user mode with a factory
shipping combination of 50-25-50. This combination is used
to open the lock and change the combination(s). You should
set the lock to your own, unique combination(s) before storing
anything of value in the safe or cabinet.
• All setup, maintenance, and troubleshooting operations must
be performed with the safe or container OPEN. Never close
the container with a change key inserted in the lock. At
the conclusion of a combination change or service operation
the lock should be checked to make sure it operates at least
three times consecutively on the intended combination before
closing the safe or container.
• The lock will sometimes emit a beep or series of beeps to
communicate its state. A table of the eleven possible beep
patterns is included in this document (page 11).
• All combinations must contain three numbers, ranging from
0 to 99. Unlike mechanical locks, the 2740 has no forbidden
zone, and it does not have a restriction on how close adjacent
numbers of the combination may be to one another.
• If you stop dialing for more than ten seconds, the lock will
reset, forcing you to begin the combination entry sequence all
over again.
• If ten incorrect combinations are entered in a row, the S&G
©
Model 2740B Electromechanical Safe Lock will shut
down for a period of ten minutes. Entering a correct
combination before reaching the tenth incorrect entry in
a row resets the
wrong combination
counter. It doesn’t
make any difference
how much time
intervenes between
consecutive wrong
combination entries.
However, entering a
correct combination
before reaching the
tenth incorrect entry
in a row resets the wrong combination counter. There is no
alternative to waiting for the penalty time to expire once it has
begun.
• The S&G
©
Model 2740B Electromechanical Safe Lock is
powered by a main battery (CR123A lithium camera-type),
and also uses a long-life backup battery (CR2450 coin cell).
Both batteries must be changed at the same time, preferably
by a technician who has successfully completed S&G factory
approved training.
• The 2740B will switch to the backup battery and latch OPEN if
the ten-beep low battery signal is repeatedly ignored. Opening
with the internal backup battery may take as long as five
seconds after the combination is entered. If you find that your
lock will not lock, the batteries will have to be replaced, and it
will need to be reset using a 444 Device.
• The lock’s combination can be changed by use of a change
key. The change key can be used by a safe custodian or
security officer following the appropriate instructions included
in this document.
• Lock bodies and covers are matched components. Do not
replace a lock cover with the cover from another lock. At best,
this will produce erratic lock operation.
Operating instructiOns
S&G
™
Model 2740B
Electromechanical Safe Lock
Document 630-848 Revised 6/26/2014
Sargent & Greenleaf, Inc.
PO Box 930
Nicholasville, KY 40340-0930
Phone: (800)-826-7652 Fax: (800)-634-4843
Phone: (859)-885-9411 Fax: (859)-887-2057
Sargent & Greenleaf S.A.
9, chemin du Croset
1024 Ecublens, Switzerland
Phone: +41-21 694 34 00
Fax: +41-21 694 34 09
©
Copyright 2014, Sargent & Greenleaf
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