The time from disconnecting the old battery cable to connecting the new battery cable should be less than 5 minutes. This method is for FANUC series 15i 150i, other systems can refer to.
After the following steps are done correctly, the BIOS settings will not be deleted. But if the BIOS settings are cleared, the following message will be displayed when powering on, and the default BIOS settings will be loaded and restarted.
"251: System CMOS checksum error - using default configuration."
Therefore, please check if the BIOS settings have been changed from the default before replacing the battery. Also, if this message is displayed unfortunately, you should modify the BIOS settings.
(1) After the smart terminal 3 is turned on for more than 5 seconds, turn off the power of the smart terminal 3, and then take the smart terminal 3 out of the panel, etc., so that it can work from the back of the smart terminal 3.
(2) Pull out the battery connector (BAT1), and then remove the battery from the holder.
(3) Lead out the wires of the new battery as shown in the figure below.
(4) Connect the cable and put the new battery into the holder.
(5) Remount the smart terminal 3.
(6) Turn on the power, and then confirm that the BIOS parameters are not erased (confirm that no error message is displayed).
