01
Open the case back of the watch.
02
Check the battery with a special device.
03
Connect the power supply to the movement to test its efficiency.
04
Check the external condition of the movement.
05
Replace the battery with a new one recommended by the manufacturer.
06
If necessary, replace the gaskets between the case and the case back.
07
Close the case back.
08
Check the case for water resistance.
