Sony CFD-CD777L Operating Instructions Manual page 22

Hooking up the system (continued)
Tip
Replace the batteries
when the OPR/BATT
indicator dims or when
the player stops
operating. Replace all
the batteries with new
ones. Before you
replace the batteries, be
sure to take out the CD
from the player.
22
Setting Up
3 Inserting batteries into the remote
Insert two R6 (size AA) batteries (not supplied)
Replacing batteries
With normal use, the batteries should last for about six
months. When the remote no longer operates the
player, replace all the batteries with new ones.
4 Using the player on batteries
Insert eight R20 (size D) batteries (not supplied) into
the battery compartment.
To use the player on batteries, disconnect the AC
power cord from the player.