(b) If the chair power cord is not disconnected and the chair still doesn't
operate, continue down the "Probable Cause" column.
(4) The four conductor plug on the chair is not securely plugged into the
black coil cord at the rear of the lift. On newer models, the chair-base connector is
mounted on the front of the chair. Refer to figure 2-2. Test by visually inspecting the
four conductor plug.
(a) If not securely plugged into the black coil cord, make a secure
(b) If securely plugged, continue to the next probable cause.
Figure 2-2. Dental chair power cord.