Base unit back-up batteries, Replacing the base power reserve batteries – AT&T 7720 User Manual
Page 45
BASE UNIT BACK-UP BATTERIES
Replacing the Base Power Reserve Batteries
The base unit back-up batteries need to be replaced when the PWR RESERVE
BATT LOW light on the base flashes when the phone is on.
1
Turn the base unit over. (Remove the wall bracket if the phone is
wall-mounted.)
2
Open the battery compartment door.
3
Remove the old batteries.
4
Insert four new AA batteries as indicated by the diagram in the
compartment.
5
Close the battery compartment door.
IMPORTANT: Do not install batteries during a power failure. Installing
batteries during a power failure will not enable the phone to work.
When battery power is low, the PWR RESERVE BATT LOW light goes on.
Replace the batteries promptly.
43