There are two buttons on both above and below of each handpiece. The two
buttons may be in the upspring or press-down state. Before connect it onto the
machine, it must be in the press-down state. So press down the 2 buttons firstly.
2.1.2 Connect it in the right direction.
There are two parts of the connectors: machine part and handpiece part. Please
look at the following pictures. A1 connects to B1, and A2 connects to B2. It
cannot plug if connecting A1 to B2.
4.1.3 Use some power of your hands to plug it. When you plug one well, you
Machine part
Handpiece part
A1
B1
B2
A2
