Introduction
The Philips Sonicare has a lot of votes on the internet, good and bad. Good especially as long as the product works, bad because it does not last very long.
- 
                  
                  - 
            Seen from below, the handpiece is oval-shaped. Wrap with a cloth, with a pair of pliers, a nutcracker or similar. start where the feet are and put the oval in a circle. At the same time, press the handpiece upside down, ie with the metal shank in front, onto a wooden base, whereby the inner life is expelled. 
 
- 
            
- 
                  
                  - 
            Remove the underside of the handpiece by carefully lifting the tabs at the two farthest vertexes of the oval with a small screwdriver. 
 
- 
            
- 
                  
                  - 
            Use a puller to remove the plastic cap from the metal shaft to expose the defective rubber boot. 
 
- 
            
- 
                  
                  - 
            Thoroughly clean all housing parts with water and cloth. 
- 
            Thoroughly clean the electronics and mechanics with isopropyl alcohol and a fine brush. 
- 
            Also completely rid the metal shaft of any residue. 
 
- 
            
- 
                  
                  - 
            Place the inner workings of the handpiece without housing parts in a container in such a way that the main board points downwards and the battery points upwards. 
- 
            Now fill the container with isopropyl alcohol just enough so that the liquid level reaches the circuit board. 
- 
            Leave to stand for 1-2 hours under supervision, then remove the device from the liquid bath and allow to dry. 
 
- 
            
- 
                  
                  - 
            The defective rubber sleeve on the metal shaft must be replaced. A spare part is available for less than € 4 on eBay under the following designation: "Philips electric toothbrush Waterproof sealing parts for HX6730 HX6930 HX9340». 
 
- 
            
Repeat the steps in order to reassemble your device.
 
                    
Wrap the body in a cloth. Invert the body, pointing the metal shank down. Use a pair of channel locks or regular pliers and gently compress the front and back surfaces about a half inch above the base, allowing the sides to separate (forming an oval). At the same time, press the metal shank down against a stable wooden base, allowing the inner mechanism to slide out of the body. If the inner mechanism seems stuck, put a little more pressure on the pliers, as there are two small locking tabs on the sides that keep the mechanism in and may be restricting its movement.
Michael -