REPLACING THE SEAT MOTOR
The dental chair travels beyond the exit position. You have isolated the
malfunction to a faulty limit switch. You must remove and replace the seat motor. Refer
to figure 3-9.
Figure 3-9. Seat motor removal.
a. Run the chair up to its full height.
b. Disconnect the external power source.
c. Disconnect the chair electrical cords from the lift.
d. Remove the four screws and nuts securing the chair to the lift.
e. Lift the chair free and place it on its side on the floor.