The central access control machine is dead, how to unlock it?

Two-wire plug lock has two wires, red and black, red is connected to power supply+12VDC, and black is connected to GND. Disconnect any wire of the double-wire plug lock, the lock head retracts and the door opens. Double-wire plug lock, the design is relatively simple, and there is no single chip microcomputer control circuit. The impact current is relatively large, which belongs to the low-grade plug lock with relatively low price.

The four-wire plug lock has two wires, red and black, red is connected to the power supply+12VDC, and black is connected to GND. There are also two white lines, which are door magnetic signal lines, reflecting the on-off state of the door. It outputs different switch signals to the entrance guard controller for judgment according to the switch state of the front door through the door magnetism. If it is not necessary, you can not connect. The four-wire plug lock can be controlled by single chip microcomputer to make it have the functions of delay and so on.