A：
The following steps should be followed to handle faults and maintenance of security door locks:
1. Regular inspection: Regularly check the lock body, connecting wires and installation parts to ensure that there is no looseness, wear or corrosion.
2. Troubleshooting: When an abnormality occurs, check whether the power supply, cable connection, and security control system signal are normal.
3. Replace damaged parts: If mechanical wear or electrical damage is found, the corresponding parts should be replaced immediately.
4. Cleaning and maintenance: Keep the door lock surface and latch area clean to avoid dust and foreign matter affecting normal operation.
5. Functional test: Perform functional test after maintenance to confirm that unlocking, locking and signal interaction with the control system are normal.
6. Follow the manufacturer's guidelines: Follow the maintenance instructions provided by the manufacturer to avoid unauthorized disassembly that affects safety performance.
Regular maintenance and correct fault handling are the key to ensuring long-term and reliable operation of security door locks.
