Technician A says it is best to check the opening and closing of automatic doors in manual mode. Technician B says that automatic doors do not need to be adjusted. Who is correct?

Checking the opening and closing of automatic doors in manual mode is an important step in ensuring that the doors function correctly and safely. By doing so, Technician A emphasizes the need to verify that the doors can operate manually without any issues, which can help identify potential problems that may not be apparent when the doors are operating automatically. This practice ensures that even in a failure of the automatic system, the doors can still be opened and closed without obstruction, which is critical for safety and functionality.

Technician B's statement that automatic doors do not need to be adjusted overlooks the fact that various factors can affect their operation, such as wear and misalignment over time. While it may be that some automatic doors are factory-set and require minimal adjustment, regular checks and adjustments may still be necessary to maintain their performance and ensure safety.

In this context, Technician A's approach is more comprehensive and responsible, making it the correct answer.