For this repair, you will need a Phillips head screwdriver and a replacement left or right wheel.
First, flip bObi's power switch OFF.
Next, remove the 2 screws holding bObi’s left or right wheel in place.
Next, remove bObi's front wheel to access one of the screws holding her together. Turn bObi's front wheel towards her bumper and, using a screwdriver for leverage, grip the wheel firmly and pull it up.
Remove the screw located beneath bObi's wheel.
Detach bObi's dustbin and remove the 2 screws on either side of it.
Remove the 2 triangular corner pieces held down by these screws.
Pull the main brush compartment forward to expose the red fastener behind bObi's main brushes. Remove the 2 smaller screws holding the red fastener in place.
Lift bObi's brush compartment up and out. To detach her brush compartment completely, unplug it from bObi by pulling at the circuit junction.
Remove the 4 screws located beneath bObi's main brushes.
Remove the 2 screws securing the red contact point fastener onto bObi, and pull off the fastener.
Flip bObi back onto her wheels and lift her cover up.
There are 2 circuit plugs which must be removed to separate bObi's cover completely: a yellow-wired circuit plug connected to the left side of bObi's main board, and a white-wired circuit plug connected to the center of bObi's main board.
bObi's left and right wheels plug into the center of her main board, closer to bObi’s front. If there is glue holding the circuit plug onto bObi's main board, simply peel off the glue and pull the wiring up.
Remove bObi's old wheel and place the new one in its stead.
Attach the new wheel's circuit plug to bObi's main board. You may add glue or electrical tape to the new wheel’s circuit plug for a more secure hold.
Now you’re ready to put bObi’s cover back together. Reconnect the white-wired circuit plug to the center of bObi's main board and the yellow-wired circuit plug to the left side of her board. Press each circuit plug firmly until they lock in their holders.
Carefully replace bObi’s cover. Make sure its edges align precisely before laying down the contact point fastener and reinstallling its 2 screws.
Next, reinstall the 4 screws located beneath bObi's brush compartment.
Reattach bObi's brush compartment.
Line up the red brush fastener on bObi and replace its 2 smaller screws.
Lay the 2 corner pieces down.
Reinstall the 2 screws on either side of bObi's dustbin.
Reinstall the screw located beneath bObi's front wheel.
Replace bObi's front wheel by turning it towards her bumper and pressing down.
Lastly, make sure bObi's replacement wheel lies flat in its compartment before reinstalling its 2 screws.
Your repair is now complete!