Probably the same as most Sharps: Turn key to OP/XZ mode. Press receipt (RCPT) button. Turn key back to REG mode.
If you need a manual, one of the users has it listed here:
http://the-checkout-tech.com/manuals/cashregisters/Sharp_XE-A207W_XE-A207B_XE-A23S_Operation_Programming_manual.html
Registerman, November 2013