This occurs if the battery jumper on the SCU card is in the disengaged position.
While following static electricity precautions, remove the SCU from the shelf.
Locate the battery jumper J3 on the SCU. With the component side facing up and the extractor handle on left edge, jumper J3 is in the upper left corner near the battery.
Remove the plastic housing from pins 2 and 3 (disengaged position).
Place plastic housing over pins 1 and 2 (position for normal operation).
Install the SCU card into the shelf and set the date and time as normal.