Casio CZ/ VZ/ FZ - Pro Series

Hi CZ Lovers!

My cz1000 has been stored for the last 12 months, and now I need to 
use it, i can`t find the power adapter that came with it, oops!

I have another power supply 1amp at 9v but have no idea what the 
polarity is on the cz, only reads 9v

Can anyone give me the correct polarity on the keyboard socket, is the 
center pin (-) or (+)

Would greatly appreciate any help.

Paul Cooke