Sony CFD-W57 Operating Instructions (primary manual) Operating Instructions Manual page 28

Note
When you operate the
player on batteries,
– the backlight in the
display does not
light.
– you cannot turn on
the player using the
remote.
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.
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.
27 EN
Setting Up