Sony CD Walkman D-FJ61 Operating Instructions Manual page 26

Troubleshooting
Radio
Symptom
The audio is weak or has poor
quality.
26
Cause and/or corrective actions
c Charge the rechargeable batteries. (pages 21, 22)
c Replace the batteries with new LR6 (size AA) alkaline batteries.
(page 23)
c Move the CD player away from the TV.