Song Jia visual boot did not respond.

1, check the electric locks on the door. Most of them are electric locks, except for problems, which may be poor contact such as broken wires. Check the wiring of the door crane and the electric lock and the separate power cord of the electric lock respectively.

2. Check whether the unlock key on the extension is normal. Then find out which two lines to the weak current well are control communication lines, and check whether it is short circuit or open circuit, and you can find out the problem.

3. The unlocking signal module on the circuit board is faulty, and the signal line is broken or has poor contact. Check the short circuit protection between the extension and the floor (floor platform). The reason may be one of these two places.