I've lost my adapter for my CTK 2100 and when I checked the back panel, it says to only use AD-5 adapter which is 9V 850mA, but now it's nowhere to be found even in Casio's own store here in India. There's an another adapter in store which goes by LAD-5 and it's 9V and 850mA as well. So, can I use that as my replacement for the AD-5 adapter?