When Royal 9170 cash register is powered on ( Plugged in, then turned on by switch ) it says power fail. I have tried keeping switch turned on and just unplug and plug it back up same thing and while the screen reads power fail the printer is constantly running.

Alan, February 2023

Manual here:

https://www.royal.com/cashreg/Alpha_9170_Manual.pdf

Endn, February 2023

HALF SYSTEM CLEAR PROCEDURE
a. Turn the key to the "PRG" position.
b. Unplug the cash register from the power source (pause for 10 seconds) and replug the cash register.
c. Continue with normal operations.

FULL SYSTEM CLEAR PROCEDURE:
Note: This procedure will erase all transaction totals and programming.

a. Turn the key to the "PRG" Position.
b. Unplug the cash register from the power source and wait at least 15 seconds.
c. While holding down the [CLEAR] key, replug the cash register.
d. Re-program the cash register.
e. Continue with normal operations.

Endn, February 2023