Sony MDR-RF4000K マニュアル

the headphones’ contact point meets the
transmitter’s contact pin, and make sure that the
CHG indicator lights up.
It takes approximate 16 hours to fully charge the battery 

(the CHG indicator goes off when charging is complete.) 

When placing the headphones on the transmitter, be 

sure to insert the left and right housings completely. 

When the transmitter’s contact pin meets the 

headphones’ contact point, the CHG indicator lights up 

in red.

-

-

  Be sure to close the battery compartment lid. The battery 

charge function is not activated when the lid is not fully 

closed.

  Check that the left and right headphones are inserted in 

the transmitter correctly.

  The indicator will not light up if the headphones’ contact 

point does not meet the transmitter’s contact pin. In this 

case, remove the headphones and insert them in the 

transmitter again so that the indicator lights up.

  Make sure that the supplied rechargeable nickel-metal 

hydride battery is installed in the battery compartment. 

  You cannot charge any rechargeable battery or dry-cell 

battery other than the supplied battery. 

Place the headphones on the transmitter after use. The CHG 

indicator lights up, and then charging starts.

Since the built-in timer recognizes when charging is 

complete, there is no need to remove the headphones from 

the transmitter after charging has completed.
Notes



 The transmitter automatically turns off while charging the battery.



 This system is designed to charge only the supplied rechargeable 

battery, type BP-HP550-11, for safety. Note that other types of 

rechargeable battery cannot be charged with this system.



 You cannot charge any rechargeable battery or dry-cell battery 

other than the supplied battery.



 Do not attempt to use the supplied BP-HP550-11 rechargeable 

battery with other components. It is for use with this system only.



 Charge in an environmental temperature of between 0 °C and 40 °C 

(between 32 °F and 104 °F). Otherwise, the battery may not be fully 

charged.



 Do not touch the contact pin of the transmitter. If a contact pin 

becomes dirty, charging may not be possible.



 Charging may not be completed if the transmitter’s contact pin and 

headphones’ contact point are dusty. Wipe them with a cotton bud, 

etc.

16 hours*

2

7 hours*

3

*

1

  at 1 kHz, 1 mW + 1 mW output

*

2

  hours required to fully charge an empty battery

*

3

  Time may vary, depending on the temperature or conditions of 

use.

Pull up the self-adjusting band and check the POWER 

indicator located on the right housing. The battery is still 

serviceable when the indicator lights in red.

Charge the rechargeable battery or install new dry-cell 

batteries if the POWER indicator light dims, flashes, or the 

sound becomes distorted or noisy.
Note

The rechargeable nickel-metal hydride battery should be replaced 

with a new one when it lasts only half the expected time, after a full 

charge has been performed. The rechargeable battery, type BP-

HP550-11, is not commercially available. You can order the battery 

from the store where you purchased this system, or at your nearest 

Sony dealer.

Commercially available (size AAA) alkaline batteries can 

also be used to power the headphones. Install the batteries 

in the same manner as described in “Inserting the supplied 

rechargeable nickel-metal hydride battery.”

When dry-cell batteries are installed, the battery charge 

function is not activated.
Battery life

Sony alkaline batteries  

LR03/AM-4(N)

10 hours*

2

*

1

  at 1 kHz, 1 mW + 1 mW output

*

2

  Time may vary, depending on the temperature or conditions of 

use.



 Do not charge a dry-cell battery.



 Do not carry a dry-cell battery together with coins or other metallic 

objects. Heat can be generated by the battery if its positive and 

negative terminals are accidentally shorted.



 If you are not going to use the unit for a long time, remove the 

batteries to avoid damage from battery leakage or corrosion.

Thank you for purchasing the Sony MDR-RF4000K Wireless 

Stereo Headphone System. Before operating the unit, please 

read this manual thoroughly and retain it for future 

reference.

Some features are:

  Wireless stereo headphone system for music and movies

  2.4 GHz digital transmission with high quality sound

  Impressive sound reproduction with 40 mm driver unit 

equipped high quality closed type headphones

  2 way transmitter design for convenient setting

  Easy battery charging system

  Lightweight headphones for long time listening comfort

  Real-time automatic tuning on headphones for best 

reception of signal

  Up to 30 meters reception range*

  7 hours playback with supplied Ni-MH rechargeable 

battery 

  Easy connection with TV/DVD/audio equipment with 

supplied audio cable

  Automatic On/Off function on headphones to preserve 

battery life

  Free adjustable headband for precise and comfortable fit

  Volume control function on the headphones
*  Transmission distance varies depending on conditions of use.

Before setting up the system, check that all of the 

components are included.

Transmitter TMR-RF4000 (1)

Wireless stereo headphones MDR-RF4000 (1)



Wireless Stereo

Headphone System

When you put on the headphones, the headphones’ 

power turns on automatically.

The POWER indicator on the right housing lights up. Be 

sure to put the right housing  on your right ear and 

the left housing  on your left ear. Wear the 

headphones vertically on your head so that auto power 

on function is properly activated.

3

Volume control



 When watching films, be careful not to raise the volume too 

high in quiet scenes. You may hurt your ears when a loud scene 

is played.



 You may hear some noise when you disconnect the AC power 

adaptor from the transmitter before removing the headphones.

The approximate RF signal transmission area from the 

transmitter is up to 30 m (100 ft). 

The transmitter detects the optimum frequency 

automatically when the headphones are removed from the 

transmitter. The sound may be interrupted if the 

headphones are out of RF signal transmission area or 

reception conditions deteriorate. In this case, move closer to 

the transmitter. 
Notes



 Because this system transmits signals at 2.4 GHz, sound may be 

interrupted if interference occurs. This is due to radio frequency 

characteristics, and is not a malfunction.



 Any noise you hear through the headphones may vary depending 

on the transmitter position and room conditions. It is 

recommended that you place the transmitter in a location that 

produces the clearest sound.



 Sound may be interrupted if the transmitter is used with other 

wireless apparatus using 2.4 GHz frequency, or a microwave oven.

RF signal transmission from the transmitter automatically 

stops when an audio signal is not input for 10 minutes. 

When the transmitter stops, the transmitter’s POWER 

indicator blinks in green for 30 seconds and then turns off. 

The RF signals are automatically transmitted when an audio 

signal is input again. RF signal transmission may stop when 

an extremely low sound is input for about 10 minutes. If this 

happens, raise the volume of the connected AV component 

and lower the volume of the headphones. If signal noise is 

output from a component connected to the PHONES IN 

jacks, RF signal transmission may not stop.

Do not pull up the self-adjusting band when not in use, as 

this will consume the battery power.

Self-adjusting 

band

The earpads are replaceable. If the earpads become dirty or 

worn out, replace them as illustrated below. The earpads are 

not commercially available. You can order replacements 

from the store where you purchased this system, or at your 

nearest Sony dealer.

©2010 Sony Corporation     Printed in China

MDR-RF4000K

4-170-882-61(1)

AC power adaptor (1)

Rechargeable nickel-metal hydride battery BP-HP550-11 (1)

Connecting cable (stereo mini plug  pin plug × 2), 

1 m (39 

3

/

8

 in) (1)

Unimatch plug adaptor (stereo mini jack  stereo phone 

plug) (1)

Stand (1)

The supplied rechargeable nickel-metal hydride battery is 

not charged from the first time you use it. Be sure to charge 

it before use.

To charge the headphones, place them on the transmitter.

the battery compartment lid.
The battery compartment lid comes off.

-

PUSH button

hydride battery into the battery compartment,
matching  terminal on the battery to the  mark

in the compartment.
Do not attempt to charge any other kind of battery with 

this unit.

-

The battery compartment has a tab on the  side which holds the 

rechargeable battery in place. Insert the  terminal first when 

installing the rechargeable battery.

 Insert the tab in the hole at the top left.
 Close the lid until it clicks.

-

To avoid electrical shock, do not open the cabinet. Refer 

servicing to qualified personnel only.

Operation is subject to the following two conditions: (1) this 

device may not cause interference, and (2) this device must 

accept any interference, including interference that may 

cause undesired operation of the device. 

This Transmitter complies with IC radiation exposure limits 

set forth for uncontrolled equipment and meets RSS-102 of 

the IC radio frequency (RF) Exposure rules. This equipment 

has very low levels of RF energy that it deemed to comply 

without maximum permissive exposure evaluation (MPE). 

This Transmitter is desirable that it should be installed and 

operated with at least 20 cm and more between the radiator 

and person’s body (excluding extremities: hands, wrists, feet 

and ankles).

This Wireless stereo headphones complies with IC radiation 

exposure limits set forth for uncontrolled equipment and 

meets RSS-102 of the IC radio frequency (RF) Exposure 

rules. This Wireless stereo headphones has very low levels of 

RF energy that it is deemed to comply without testing of 

specific absorption ratio (SAR).

Nickel Metal Hydride batteries are 

recyclable. 

You can help preserve our environment 

by returning your used rechargeable 

batteries to the collection and recycling 

location nearest you.

For more information regarding recycling of 

rechargeable batteries, call toll free

1-800-822-8837, or visit http://www.rbrc.org/

Caution: Do not handle damaged or leaking Nickel 

Metal Hydride batteries.

Select one of the hookups below depending on the jack 

type:

 To connect to a headphones jack

Transmitter

Left channel 

(white)

Right channel 

(red)

To PHONES IN jacks

Connecting cord 

(supplied)

Unimatch plug 

adaptor (supplied)

To headphones 

jack (Stereo 

phone jack)

To headphones jack 

(Stereo mini jack)

WALKMAN®

*, 

TV, etc. 

 To connect to LINE OUT or REC OUT jack

Transmitter

To LINE IN jack

Right channel (red)

Connecting cord 

(supplied)

Stereo system, 

VCR, etc.

To LINE OUT or 

REC OUT jacks

Left channel (white)

*  “WALKMAN” and “WALKMAN” logo are registered trademarks 

of Sony Corporation.

To reduce the risk of hearing damage, first lower the volume.

transmitter.
If the transmitter is connected to the headphone jack, set 

the volume control of the audio source component as 

high possible but not so high that the audio signal 

becomes distorted.

The transmitter’s POWER indicator lights up in green.

-

-





Transmitter

AC power adaptor 

(supplied)

To an AC outlet

To DC IN  

5.2 V jack



 Be sure to use the supplied AC power adaptor. Using AC 

adaptors with different plug polarity or other characteristics 

can cause product failure.

Unified polarity plug



 Be sure to always use the supplied AC power adaptor. Even AC 

power adaptors having the same voltage and plug polarity can 

damage this product due to the current capacity or other 

factors.



 Connect the AC power adaptor to an easily accessible AC 

outlet. Should you notice an abnormality in the AC power 

adaptor, disconnect it from the AC outlet immediately. 

You can place the transmitter horizontally or vertically, 

using the stand.

  The stand should not be placed on a surface that is cloth-

covered, textured, dirty or dusty.

  Peel off the protection films (transparent) on the adhesive 

sheets (4 corners) of the stand. The stand cannot be 

installed with the protection films on the adhesive sheets.

  When placing the transmitter, press it down softly to 

steady the stand. 

Use a soft cloth slightly moistened to remove dust. A soft 

cloth with mild detergent solution may be used to remove 

finger marks or grease. The power of the adhesive sheets will 

be restored for repeated use.

Move the stand slowly with your fingers on the edge of the 

stand. The adhesive sheets will not be detached with a sharp 

move.  

3

-

3

-

If you run into any problems using this headphone system, 

use the following checklist. Should any problem persist, 

consult your nearest Sony dealer.



  Check the connection between the transmitter and the AV 

component.



  Check that the connected AV component's optical digital output 

is set to 

“ON” when selecting digital input.



  Turn on the AV component connected to the transmitter, and 

start the playback.



  If you connect the transmitter to an AV component using the 

headphone jack, raise the volume level on the connected AV 

component.



  Make sure you are wearing the headphones correctly.



  Raise the headphone volume.



  The headphones’ POWER indicator goes off.



 Charge the rechargeable battery if it is weak, or replace alkaline 

batteries with new ones. If the POWER indicator is still off 

after charging the battery, take the headphones to a Sony 

dealer.



  Charge the rechargeable battery if it is weak, or replace alkaline 

batteries with new ones. If the POWER indicator is still off after 

charging the battery, take the headphones to a Sony dealer.



  Check if there is any wireless apparatus using 2.4 GHz frequency, 

or a microwave oven in the vicinity.



  Change the position of the transmitter.



  If you connect the transmitter to an AV component using the 

headphone jack, lower the volume level on the connected AV 

component.



  If you connect the transmitter to an AV component using the 

headphone jack, raise the volume level on the connected AV 

component.



  Raise the headphone volume.



  Check if there is any wireless apparatus using 2.4 GHz frequency, 

or a microwave oven in the vicinity.



  If you connect the transmitter to an AV component using the 

headphone jack, raise the volume level on the connected AV 

component. 



  Charge the rechargeable battery if it is weak, or replace alkaline 

batteries with new ones. If the POWER indicator is still off after 

charging the battery, take the headphones to a Sony dealer.



  The transmitter stops transmitting if no signal is input for 10 

minutes.



 If you connect the transmitter to an AV component using the 

headphone jack, raise the volume level on the connected AV 

component.



  Check if the CHG indicator turns on. If not, put the headphones 

on the transmitter correctly so that the CHG indicator turns on.



  Dry batteries are installed.



 Insert the supplied rechargeable nickel-metal hydride battery.



  Rechargeable batteries other than the supplied are installed.



 Insert the supplied rechargeable nickel-metal hydride battery.



  The transmitter’s contact pin and headphones’ contact point are 

dusty. 



 Wipe them with a cotton bud, etc.



  The headphones cannot receive the signal from the transmitter.



 Move within the RF signal transmission area.



 Check the connection of the transmitter, AC power adaptor, 

and AC outlet.



 Check if there is any wireless apparatus using 2.4 GHz 

frequency, or a microwave oven around the transmitter and 

headphones.



 Change the position of the transmitter.



  There is no audio signal input for about 10 minutes and RF 

signals are not transmitted.



 Input the audio signal to the transmitter.



  Reset the system.



 Push a small pin, etc., into the hole of the transmitter until you 

feel a click. 

The POWER indicator on top starts blinking in green.

 Once the POWER indicator starts blinking, pull up and hold 

the self-adjusting band to turn on the headphones, and push a 

small pin, etc., into the hole of the right headphone until you 

feel a click. 

The POWER indicator of the transmitter stops blinking and 

stays lit in green.

3

-



  Do not drop, hit, or otherwise expose the headphones to 

strong shock of any kind. This could damage the product.

  Do not disassemble or attempt to open any parts of the 

system.

  If you are not going to use the system for a long time, 

unplug the AC power adaptor from the AC outlet. When 

removing the plug, grip the AC power adaptor. 

Do not pull on the cord.

  Do not place the system in any of the following locations.

–  Location exposed to direct sunlight, near a heater, or 

other extremely high-temperature location

–  Dusty location

–  On an unsteady or inclined surface

–  Location exposed to large amounts of vibration

–  Bathroom or other high-humidity locations

When the volume is too high, the sound leaks outside the 

headphones. Be careful not to raise the volume so high that 

it bothers people around you.

There is a tendency to raise the volume when using in noisy 

places. However, for reasons of safety, it is advised to keep 

the volume at a level whereby you can still hear sounds 

around you.

Use a soft cloth slightly moistened with mild detergent 

solution. Do not use solvents such as thinner, benzene or 

alcohol as these may damage the surface.

  When the product breaks, or if a foreign object gets inside 

the unit, immediately turn off the power and consult your 

nearest Sony dealer.

  When taking the system to a Sony dealer, be sure to take 

both the headphones and transmitter.

Modulation System   

GFSK

 

2.404 GHz - 2.476 GHz

 

Approx. 30 m (100 ft) of longest

Frequency response   

10 Hz - 22,000 Hz 

 

1% or less (1 kHz)

 

Phono jacks (left/right)  

Stereo mini jack

Power requirements   

DC 5.2 V (from the supplied AC power adaptor)

 

Approx. 246 mm × 62 mm × 129 mm (9 

3

/

4

 in × 

2 

1

/

2

 in × 5 

1

/

8

 in) (w/h/d)

Approx. 430 g (15.2 oz)

12 Hz – 22,000 Hz

Rechargeable nickel-metal hydride battery 

(supplied) or commercially available (size AAA) 

alkaline batteries

Approx. 300 g (10.6 oz) (including the supplied 

rechargeable nickel-metal hydride battery)

AC power adaptor (5.2 V) (1)

Rechargeable nickel-metal hydride battery  

BP-HP550-11 (550 mAh) (1)

Connecting cable (stereo mini plug  pin 

plug × 2), 1 m (39 

3

/

8

 in) (1)

Unimatch plug adaptor (stereo mini jack  

stereo phone plug) (1)

Stand (1)

Card warranty (1)

Operating Instructions (this manual) (1)

Optical digital connecting cable POC-15AB 

(1.5 m, 59 

1

/

8

 in) (mini-plug  rectangular plug)

Design and specifications are subject to change without 

notice.

Operating Instructions
Mode d’emploi