How to Clean the Cliff Sensors | Roomba® 600 series | iRobot® - YouTube
iRobot Roomba 655 Pet Series Cliff Sensors Replacement - iFixit Repair Guide
New, simpler fix for the cliff sensor problem where the Roomba won't go over dark carpets (and may get stuck) because it thinks there's a cliff. Verified for Roomba 690. : r/roomba
Roomba 550/5xx Cliff Sensor
Roomba 550/5xx Cliff Sensor
How to Fix the Roomba Error 6 Trouble Code - Dengarden