what's up?

Cause of the malfunction and troubleshooting the system after a power unit can not power on 1,220 V AC power failure: Check the 220V AC input 2, the system power failure: Check whether the system power output, the normal for the 18V "24V, if not then check the system power whether the insurance burned 3, check the power and ground lines are shorted 4, the middle of testing whether each wiring damage or short circuit fault can not be achieved password lock 2 console 1, 2, check the password is correct, the operation is not correct: Please read the instructions, look at ways to set the password is wrong or password is not successful; 3, part of the building intercom system, unlocking the power line above to go to the system, if the host displays "OPEN": that the normal host, please Check the electrical connections are correct lock, electric lock power supply is short circuit or short circuit with other line