Maintenance 5 5.1 Replacing Encoder Backup Battery The encoder backup batteries should be replaced every two years. Replace the batteries according to the procedure below. 1. Prepare a new set of 3 backup batteries for replacement. 2. Turn off AC power to the PA-4 and DC power to the controller. 3. Remove the cover from the robot unit. See Figure 5-1 . Connector Plate Battery Support Plate Figure 5-1. Removing Cover to Replace Encoder Batteries 4. Pull out the battery support plate. See Figure 5-2 . Adept Viper s1300 Robot User’s Guide, Rev B 49