ER-390M Getting Started • 13
Memory Clear CAUTION: The procedures described in this area are security sensitive. Clearing
all or parts of the ER-390M memory may cause damage or loss to the program. Do
not share this information with unauthorized users and distribute the special
SERVICE-Mode key only to those you may want to perform these functions.
Memory All Clear
Perform "Clear All Totals", or "Clear PLU File" if you wish to clear only parts of ER-390M
memory. Complete clearing of all memory areas and installation of the default program can
be done through the following special procedure:
1. Turn the power switch located on the right side of the register to the OFF position.
2. Turn the control lock to the S position one position.
3. Press and hold the key position where the CHECK key is located on the default
keyboard layout.
4. Continue to hold the CHECK key while turning the power switch to the ON position.
5. Press the upper left key o f the keyboard, then the lower left key, then the upper right key,
and finally press the lower ri ght key.
6. When memory is cleared, the register prints a message “RAM ALL CLEAR OK!”