Make sure that you have the replacement spare part available.
-
Switch off both AC (mains) power switch and battery switch.
Make sure that there is no AC (mains)
power available for the system.
-
Disconnect the wiring and pull out the component from the DIN rail.
If needed, use the screwdriver.
-
Attach the replacement component on the DIN rail.
-
Connect the cables.
-
Power up the system.