Sharp Mobilon HC-4000 Operation Manual page 25

5. Reattach the battery holder to the unit, noting the position of the projecting
part on the battery holder.
6. Slide the battery replacement switch back to the NORMAL OPERATION
position.
If this proves difficult, check to make sure the main battery holder is
completely inserted.
Note:
The unit operates only when the battery replacement switch is in the NORMAL
OPERATION position.
7. After battery replacement, turn on the unit and make sure no warning
message appears.
Caution:
Avoid placing your finger in the space left when you remove the main battery
holder. Your finger may become trapped when you close the unit.
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