Cleaning The Sensors - Philips FC9910 Handbuch

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6 Reinsert the square pin on the right-hand side of the roller brush
into the square hole in the bearing block.
7 Place the other end of the roller brush in the recess.
8 Place the roller brush retainer over the roller brush and press the
sides of the retainer home until the latch hooks lock into place
('click').

Cleaning the sensors

1 Clean the obstacle detection sensors in the bumper of the robot
vacuum cleaner with a cotton bud.
2 Clean the floor detection sensors on the bottom of the robot
vacuum cleaner with a cotton bud.