Inovance MD880 Series - Replacing the Battery of the HCU Control Module

5 Maintenance and Repair
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Step 3: Ensure that the SD memory card is pushed into position. Otherwise, an
abnormality will occur due to poor contact.
5.5.2 Replacing the Battery of the HCU Control Module
Perform the following steps to replace the battery used for powering the clock of the
HCU control module:
Step 1: Turn the battery cover 90° counterclockwise with a 2 mm slotted screwdriver to
open the cover.