Sony CD Walkman D-NE331CK Operating Instructions Manual page 31

Symptom
Play stopped abruptly.
Others
Symptom
When closing the lid of the CD
player, the CD starts to rotate.
Cause and/or corrective action
 The off timer has been set. Change the setting of "TIMER" to
"OFF" (  page 27).
 The dry battery is used up completely. Replace the dry battery
with a new LR6 (size AA) alkaline battery (  page 13).
Cause and/or corrective action
 The player is reading the information on the CD, not
malfunctioning.
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