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Repair anti-falling sensors (JISIWEI I3)? -Walk in cycle but wheels are good

Phenomenon of the video: The right/ left wheel is ok,  but the robot always changes directions just like there are invisible obstacles. 

Exclude the below reasons: 

1. There are strong sunshine that disturbed the infrared sensor.

2. The direction wheel is fixed too tight. (Take the derection wheel out, make it clean , and push it back.)

Find the real problems: Fix the 2 lights more protruding.

WIFI vacuum cleaning robotWIFI vacuum cleaning robot


First, Open the shell: 

Second , Re-install the 2 indicator lights:


Third, Fix the cover back