Mitsubishi Electric Q26UD(E)HCPU User Manual page 252

(2) Q7BAT-SET battery installation procedure
When changing the battery for the CPU module from the Q6BAT to the Q7BAT, set the battery and connect its
connector in the following procedure.
Open the CPU module bottom cover.
Disconnect the connector connecting the
Q6BAT to the CPU module.
Remove the Q6BAT and cover from the
CPU module.
Connect the Q7BAT- SET to the battery
connector of the CPU module and set it
into the connector holder of the battery
holder.
Set the Q7BAT- SET in the CPU module.
Firmly push the connector all the way.
250
Completed
Connector
Connector
stopper
CPU module
Battery holder