As we all know, a switch panel mainly contains internal PCB and external shell. After all design work is done, our engineer will make a few samples first.
I took a few pictures when our engineer was making sample control panels.
She soldered resistors of different specification on the PCB according design drawing. Resistors are very tiny, so she used tweezers to pick each resistor from the box. The box in the third picture is flat and is divided into many small grids. Each grid has a cover, so when you use a kind of resistor, just open its cover leaving other resistors concealed.
After she completed soldering resisters, she needed to solder springs and digital tubes as well as USB port.