Samsung SR8F40 Manuel D’Utilisation

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Cleaning the Driving Wheel
you must turn off the Power Switch at the bottom of the main 
unit before cleaning the robot.
 
If the vacuum cleaning robot suddenly starts to zigzag, there may be 
foreign substances stuck on the driving wheel.
1.  When cleaning the driving wheel, place a soft cloth on the floor and 
flip the main unit, placing it down carefully.
2.  Check for foreign substances and remove them using a stick or a 
pair of blunt nippers if necessary.