How do I fix my Sharp vacuum EC-T4660?

I had the same problem with the same model.
Turned out to be the carbon brushs on the motor had stuck in the guides causing the motor carbon brushs to loose contact with the rotor in the motor.
Had to completly take the vacuum apart and file the carbon brush guides back into shape and the vacuum works fine again.
Has happened three times since I owned the unit...

Bill
January 2008