Polarity symbols on universal AC-DC adaptor
Assume Nothing, Verify Everything.
1 - The center conductor should be Pos.
2 - It sure looks like an improper symbol is being used on the CB.
3 - If the switch is to the LEFT then the circuit is POS to the Top and Neg to the Bottom.
4 - If the switch is to the Right then the circuit is NEG to the Top and POS to the Bottom.  - Simple answer - The + &amp; - are correct it is the Battery Pictorial that is incorrect.
5 - My SWAG is since the symbol is so poor it confused the board manufacture and he just got sloppy.