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N Additional information
Precautions
• When the transmitter is not to be used for a
long period of time, disconnect the AC power
adaptor from the AC outlet holding the plug.
Do not pull on the cord.
• Do not leave the wireless stereo headphone
system in a location subject to direct sunlight,
heat or moisture.
Notes on headphones
Preventing hearing damage
Avoid using headphones at high volume.
Hearing experts advise against continuous, loud
and extended play. If you experience a ringing in
your ears, reduce the volume or discontinue use.
Caring for others
Keep the volume at a moderate level. This will
allow you to hear outside sounds and to be
considerate to the people around you.
If you have any questions or problems
concerning the system that are not covered in this
manual, please consult the nearest Sony dealer.
Be sure to bring the headphones and the
transmitter to the Sony dealer when requiring
repair work.
Problem
No sound/
Muffled
sound
Solution
Turn on the transmitter first, then put
on the headphones.
Check the connection of the audio/
video equipment or the AC power
adaptor.
Check that the audio/video
equipment is turned on.
Turn up the volume on the connected
audio/video equipment, if the
transmitter is connected to the
headphones jack.
MDR-RF920RK:
Change the radio frequency with the
CHANNEL selector on the
transmitter, then tune the headphones
with the TUNE control.
MDR-RF960RK:
Change the radio frequency with the
CHANNEL selector on the
transmitter, then press the TUNE
button again.
The mute function is activated.
Use the headphones near the
transmitter.
The headphones’ POWER indicator
light is weak or turned off.
•Charge the supplied rechargeable
batteries or if the POWER indicator
is still off after charging the
supplied rechargeable batteries, take
the headphones to a Sony dealer for
replacement of the rechargeable
battery.
If you connect the transmitter to the
LINE OUT or REC OUT jacks of an
audio reproducer, make sure that the
NOISE FILTER switch is set to OFF.
Make sure that the NOISE FILTER
switch is set to either ON or OFF (If
the switch gets stuck between ON and
OFF, the sound will be cut off).
Troubleshooting