For this repair, you will need a Phillips head screwdriver and a replacement front wheel sensor.
Make sure Bob’s side power switch is turned OFF and flip him over onto a flat surface. Remove the screw securing Bob’s main brush in place.
Remove Bob’s main brush to access and remove the screw located beneath it (depending on Bob's model, there may be 2 screws).
Remove the 5 screws lining Bob’s underside.
Flip Bob back onto his wheels and lift his cover up. Slid the power inlet out of its space.
To remove Bob’s cover completely, detach 4 circuit plugs from the mainboard. Pinch the small white tab on the side of each circuit plug and pull upwards to remove it.
Place the cover aside for later reassembly.
To access the UV lamp, you'll first need to remove the mainboard. Disconnect all remaining 12 circuit plugs from the mainboard.
Remove the 3 screws securing the mainboard in place.
Lift the mainboard out.
Remove the 2 screws securing the front wheel sensor.
Remove Bob's front wheel sensor from underneath him.
Grip the front wheel sensor with your hand. Using a screwdriver for leverage if needed, pop the front wheel off.
Place the new sensor on the front wheel.
Place the sensor underneath Bob so the circuit plug goes through the opening. Then connect it to the mainboard.
Replace the 2 screws securing the sensor.
Align the holes on the mainboard with the 3 screw posts on Bob’s interior. Ensure that the mainboard sits flat before replacing the 3 screws.
You may now begin reconnecting all of the mainboard's circuit plugs.
Left edge of the mainboard:
The order of plugs on the left side of the mainboard, from left to right, is:
- A small plug with black and yellow wires
- A plug with two pairs of twisted wires
- A plug with multi-colored wires for Bob’s left wheel
- A plug with blue and black wires
Bottom edge of the mainboard:
The order of plugs on the bottom of the mainboard, from left to right is:
- Two open spaces
- A small circuit plug with a red wire
- One more open space
- A small plug with yellow wires
- A plug with multi-colored wires
Right edge of the mainboard:
The order of plugs on the right side of the mainboard, from left to right is:
- A plug with black and orange wires for Bob's power inlet
- A wide circuit plug for Bob's power switch
Top edge of the mainboard:
The order of plugs at the top of the mainboard, from left to right, is:
- A small plug with black and orange wires
- Two empty spaces
- A wide plug with multicoloured wires
- A small plug with red and green wires
Now you’re ready to put Bob’s cover back together. First, reattach all the circuit plugs you removed to separate Bob's cover. Press down on each circuit plug to ensure it securely locks in place.
Before closing Bob's cover, slide his power inlet back in its place.
Carefully realign the edges of Bob’s cover and flip him onto his back. Replace the 5 screws on his underside to seal his cover together.
Replace the 1 or 2 screws located beneath Bob's main brush.
Place the main brush back in its compartment. Attach the end piece first
and align the square end with the square-shaped notch inside Bob.
Lastly, replace the screw securing Bob's main brush in place and your repair is complete!