How to reset z1 and z2 counter on a Royal 487 NX?

To reset the Z1 and Z2 counters on a Royal 487 NX cash register, first ensure the register is in the "Reg" mode. Then, press the "Mode" button to switch to the "Z Report" mode. After this, enter the appropriate key combination (usually "1" followed by "0") to access the reset function. Finally, confirm the reset by following any prompts on the display.