This is for a AR 32 I would imagine it is the same.
You change the voltage by rewiring the mains switch, first colour shown is for 115V second colour for 220V use
Mains switch PCB hole number
115V 220-240V
3 VIOLET VIOLET
4 VIOLET VIOLET
5 BROWN BROWN
6 RED Not Used
7 Not Used BLACK
8 Not Used RED
9 BLACK BLUE
10 BLUE Not Used
11 ORANGE ORANGE
12 YELLOW YELLOW