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Charging the
rechargeable battery
The headphones are powered by a rechargeable
battery (supplied) or a dry cell battery (not
supplied). Charge the rechargeable battery before
use.
1 Check that the transmitter power is off.
2 Open the battery charger lid on the
transmitter.
3 Insert the supplied rechargeable battery
NC-AA (HJ), making sure to match
battery polarity with the and marks
on the charger case.
The CHARGE indicator then lights up
and charging starts.
4 Close the battery charger lid on the
transmitter.
Charging time and battery life
About 24 hours is required to fully charge the
rechargeable battery. Once fully charged, the
battery provides about 35 hours of operation.
One hour charging of the rechargeable battery
enables about 1 hours and 30 minutes of operation.
Notes
This system is designed to charge only the
supplied rechargeable battery for safety. This
system cannot charge other batteries even if they
have the same shape.
Since little electric current is used for charging,
there is no need to worry about overcharging.
As this system is not affected by the memory
effect of the Ni-Cd battery, recharging the
supplied battery before it is completely
discharged is not a problem.
When the transmitter power is turned on, the
battery charger does not operate.
When to recharge the battery
Recharge the supplied battery when the POWER
indicator on headphones dims, and hissing or noise
occurs.
If the POWER indicator dims even after full
charging, the battery is completely dead. To
purchase a new rechargeable battery, consult your
nearest Sony dealer.
Troubleshooting
No sound/Muffled sound
/ Turn on the transmitter and the headphones 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. (Around level 5 or 6 on the
volume control should be appropriate.)
/ The mute function is activated.
Check if there is any object between the
transmitter and the headphones.
Use the headphones near the transmitter.
Change the position and angle of the transmitter.
/ The POWER indicator on the headphones dims.
Recharge the supplied battery. If there is no sign
of improvement, please consult your nearest Sony
dealer.
Replace the battery of the headphones.
Distortion
/ If the transmitter is connected␣ to␣ the␣ headphones
jack, turn down the volume of the connected
audio/video equipment. (Around level 5 or 6 on
the volume control should be appropriate.)
/ Recharge the supplied battery.
/ Replace the battery of the headphones.
Loud background noise
/ Move closer to the transmitter. As you move away
from the transmitter, more noise is likely to be
heard. This is inherent to infrared ray
communication and does not mean that there is a
problem with the unit itself.
/ Check that there is no object between the
transmitter and the headphones.
/ Check that the infrared sensors are not covered
with your hands or hair.
/ Change the position or angle of the transmitter.
The headphones are used by a window where the
sunlight is too strong.
n Draw the curtains/blind to shut out the direct
sunlight, or use the headphones away form
the sunlight.
/ If the transmitter is connected to the headphones
jack, turn up the volume of the connected audio/
video equipment. (Around level 5 or 6 on the
volume control should be appropriate.)
/ Recharge the supplied battery.
/ Replace the battery of the headphones.
Specifications
General
Modulation system
Frequency modulation
Carrier frequency Right 2.8 MHz
Left 2.3 MHz
Frequency response
18 – 22,000 Hz
Transmitter TMR-IF125R
Power source DC IN 9V jack accepts power supplied
from the AC power adaptor for use on
the following voltages:
Audio input Phono jacks/stereo mini jack
Dimensions Approx. 152 × 40 × 72 mm
(6 × 1
1
/2 × 2
3
/4 in.) (w/h/d)
Mass Approx. 88 g (3.1 oz.)
Headphones MDR-IF120
Power source DC 1.5 V, 1 × R6 (size AA) battery
Mass Approx. 130 g (4.6 oz.) including battery
Optional accessories
Plug adaptor
PC-236HG (stereo mini jack ˜ monaural mini plug)
PC-234HG (stereo mini jack ˜ stereo phone plug)
Connecting cords
RK-C510HG/RK-C515HG/RK-C520HG
(phono plug × 2 ˜ phono plug × 2)
RK-G136HG (stereo mini plug ˜ stereo mini plug)
RK-G129HG (stereo mini plug ˜ phono plug × 2)
Design and specifications are subject to change without
notice.
Setting up the
headphones
1 Open the battery compartment lid on the
left inner side of the headband.
2 Insert the supplied rechargeable battery
NC-AA (HJ) by matching the and
on the battery to the and in the
battery compartment.
Make sure that the battery is charged.
3 Close the battery compartment lid.
Using a dry cell battery
Insert the dry cell battery into the headphone
battery compartment the same as when inserting
the rechargeable battery.
Battery life
When to replace the battery
Replace the battery with a new one when the
POWER indicator on the headphones dims, and a
hissing noise increases.
Listening to a program
1 Turn on the audio/video equipment
connected to the transmitter.
2 Turn on the transmitter. The infrared
emitters light up.
3 Turn on the power of the headphones.
The power indicator lights in red.
4 Put on the headphones.
5 Adjust the volume.
Mute function
If a hissing noise is heard when the infrared rays
are obstructed, or the headphones are used outside
of the effective range (see “About the infrared rays
communication”), the mute function will be
activated and the sound will not be heard from the
headphones. To restore the sound, move nearer
toward the transmitter or remove the obstruction.
After listening to a program
Take the headphones off before turning off the
headphones and the transmitter. Otherwise you
may hear some noise when the infrared rays are
suddenly cut off.
Note
The infrared emitters light up when the transmitter is
turned on. The brightness of the emitters may not be
uniform, however, this is not a malfunction.
Battery
Sony alkaline battery
LR6/AM3 (N)
Sony battery
R6P/SUM-3 (NS)
Approx. hours
100
50
Precautions
Before operating the system, check that the
operating voltage of your system is identical with
the voltage of your local power supply.
The CE mark on the unit is valid only for
products marketed in the European Union.
When the headphones is not to be used for a long
period of time, remove the battery to avoid
damage caused by battery leakage and
subsequent corrosion.
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 cordless stereo headphones
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.
Replacing the Ear
Pads
When the ear pads become dirty or damaged,
consult your nearest Sony dealer and replace them
as illustrated below.
Where purchased
U.S.A./Canada
U.K.
European countries
Other countries
Japan (Except for Japanese
domestic model)
Operating voltage
120 V AC, 60 Hz
230 – 240 V AC, 50 Hz
220 – 230V AC, 50 Hz
220 – 230 V AC, 50/60 Hz
or 120 V AC, 60 Hz
110 – 120 V/220 – 240 V
AC, 50/60 Hz
POWER
ØON
ø OFF/CHG
POWER
ØON
ø OFF/CHG
Remove the old ear
pad by pulling it out.
Place the new ear
pad on the housing
as illustrated.
Make sure that the ear
pad is securely replaced.
2


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