Anti-tamper device, method of controlling an anti-tamper device, and a fiscal printer using the same

A control method for an electronic appliance having an anti-tamper device, the method comprising:

• detecting a removal sequence of a plurality of fasteners from the electronic appliance;
• comparing a specified removal sequence with the determined removal sequence;
• and
• when the compared sequences differ, limiting one or more specific operations of the electronic appliance or causing the electronic appliance to execute one or more specific operations.

A fiscal printer comprising:

• an electronic journal memory that records fiscal information related to sales transactions;
• a case housing the electronic journal memory thereinside;
• a cover that covers the case;
• a plurality of fasteners that fasten the cover to the case;
• a plurality of sensors that are disposed in the case and change state when the fasteners are removed;
• a control unit that detects the state changes of the sensors;
• a specified sequence recording unit that records a specified sequence for state changes in the sensors;
• and
• a detection sequence recording unit that records the order in which the state changes of the sensors were detected when the control unit detects a state change in the sensors;
• the control unit comparing the specified sequence recorded in the specified sequence recording unit with the detected order of the state changes in the sensors recorded in the detection sequence recording unit, and prohibiting access to the electronic journal memory when the compared sequences differ.