A:Answer Hi, Hoffy, Before purchasing a replacement, make sure to check if the right and left headphones are rested on the
transmitter correctly. Take off the headphones and place
them on the transmitter again so that the headphones’
contact points meet the transmitter’s contact pins.
For more tips and steps, please visit this link: https://docs.sony.com/release//Manual_4691893111.pdf
Regards,
Vincent