Yamaha RCX240 User Manual page 64

9. Connecting the absolute batter y
n
NOTE
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Chapter 3 INSTALLATION
Return-to-origin is incomplete if an absolute battery connector is unplugged from
the BATT connector while the controller power is turned off. When shipped to the
customer, the absolute batteries are not connected to the controller, so an error
message is always issued when the power is first turned on. Please note that this is
not an abnormal condition.
The batteries must be connected when using the controller for the first time or
must be replaced when the backup time was exceeded while the controller
power was off.
Unplug the absolute battery connectors when you are going to store the
controller for a period of time that is much longer than the backup time.