If you to send this psu in for repair it’s worth unplugging connectors on the front and disconnecting the power supply from the motherboard.
Once disconnected leave to discharge.
Remove the four black screws from the cover and the four screws from the metal case and lift the top off (Disconnecting the fan as you do so).
You will see the Fanuc PCB inside which you can lift off if you remove the screws holding it down. It’s worth checking for damage around the top of the PCB the 0340 component at the top is known for breaking up and causing damage.
It’s worth checking the underside of the PCB for damage (marked below with a red ring)
We can repair these A16B-1212-0950 Fanuc power supplies with a 1-2 day turnaround
If you need them quicker we offer a service exchange service where we can supply you with the unit and you return the faulty unit to us after (we may ask for pictures to double check there is no PCB damage)
We ship worldwide our Fanuc Spares are shipped with a warranty