help need to know the specs of the diode please

sir,

need help the supplier erase the specs of the diode on the board my sonic welding machine cannot work...

They are power transistors and NOT diodes as you assume. You can clearly see the E,C,B marking
once we know the voltage (JPG 007) at the Collectors pin at the left bottom, w.r.t., Emitters common pin at the top left, we can decide the transistor in all probability.

yup, sorry my mistake... can you tell me how to measure the voltage there?

You have to measure on the wires coming to the board. If the board is working, you can measure on point B wrt point A, in the partial jpg attached, with points marked.
The schematic is attached below.