After a couple of years of relentless service, my trusty iRobot Roomba has stopped spinning his brushes. It roams the room, spins the side brush, but the bottom, counter-rotating brushes don't work anymore.
With a little searching in various forums, it seems that dust may pile up into the electric motor until a complete freeze.
Roomba is a pleasure to open: its construction is entirely modular and all the pieces come together by screws and joints. The screws, even when unscrewed, remain into their seating, so they can't be lost
I opened the underbelly by turning 5 screws.
Using an air compressor, I've sprayed lots of air on all the moving parts, removing an impressive amount of dust.
The main brushes motor is located under the red box.
You can see a hole that peeks inside the motor where you can see the copper windings: lots of compressed air in and lots of dust out!
I've reassembled all the components and voilà: Roomba is back in action.
