Reparing a power supply 82002A

[Le Babou]

Hello.

I need your knowledge.
I've just bought a hp-35 NOS.
The power supply is a 82002A model and doesn't have a big switch 110/220v under the pins.
So, I didn't made attention (stupid I am !) and I power it on.
After few seconds, it stopped working. It was set to 110 and of course it's 220v in France :\
I looked carefully and the voltage switch is a little one on the left bottom side.

The calculator has no damage.
As it's NOS, I'd like to keep the original power supply.
Can it be open to be repaired ? If so, how to do it ? If not, is there a place to buy a new NOS one ?

Sorry for beeing so long and thanks a lot for your help.
Xavier - stupid handyman...

Edit: here is a photo of the power supply. It's the first time i've seen one like this. You can see the voltage selection in the lower left corner.