IR sensing problem.

1. IR induction of the transmitter as shown.

2. IR induction of the receiver as shown.

3. IR induction is not aligned or blocked, the board's status indication as shown.

Extinguished

4. IR induction is not aligned with the situation, the necessary conditions for the correct location of equipment installation (equipment placed horizontally, the ends of the chassis are fully aligned, the two groups of chassis is not an inverted V-shaped).