OPENING A DOOR FITTED WITH A MC4 LOCK
The MC4 lock is always delivered with the number 0 selected on all the counters. By positioning
the marker “O” below the pointer on the dial ring you can open the MC4 by turning the central
knob to the right.
If you cannot turn the central knob:
◼ The MC4 may already be open: with the marker “O” positioned below the dial ring pointer,
turn the central knob to the left, then to the right.
◼ If it’s not already open, the combination may have been tamperes with. In this case, select
each counter and check that the central knob moves fully to the left stop position. The
lock is then open.
If the door also has a key lock, open this and then use the handle to open the door.
SETTING UP A COMBINATION
IMPORTANT REMARK
Throughout all the following operations:
◼ The door must be open.
◼ The bolts must be extended*.
* To extend the bolts on a safe, press a lever (generally at the bottom of the door) and operate
the handle.
TO SET THE COMBINATION
1. If the lock is open, close it by turning the central knob to the left (with the mobile selector on
the marker “O”).
2. If a combination is already set, you must relect it.
3. Inside the door, lift the concealment plate (if fitted) to gain access to the rear of the MC4.
Locale the combination changing button (slotted button). Insert the “changing key” and turn
it a quarter-turn to the right, to the stop position.
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