please,
I need help on these alarms. I replaced the battery and appeared these alarms 300 apc alarm for x, y, t, c axis need zero. I tried over the 1815 first switched X, Y, T APZ to 0 but shut down so turned on, then APZ X, Y, T switched to 1 C does not want to switch to 1 remains on 0.I I try to find a starting point appears 090 alarm incomplete return. I pray for help.