Sony MDR-IF0140 - Cordless Stereo Headphones Manual

Sony MDR-IF0140 - Cordless Stereo Headphones Manual

Also See for MDR-IF0140:


Sony MDR-IF0140 - Cordless Stereo Headphones Manual


Thank you for purchasing the Sony MDRIF0140 Cordless Stereo Headphone. Before operating the unit, please read this manual thoroughly and retain it for future reference.

The MDR-IF0140 is a cordless stereo headphone using infrared transmission. You can enjoy listening to a programme free from the restriction of the headphone cord.

  • Cordless, noiseless infrared headphone resistant to external noise, etc.
  • Self-adjusting headband mechanism eliminating the need for headband adjustment.
  • Single VOL control adjusts both the right and left volume of the headphones.
  • Use with car monitors with built-in infrared transmitter.

Getting started

To prevent fire or shock hazard, do not expose the unit to rain or moisture.

Inserting the battery

  1. Open the battery compartment lid of the left housing.
    Inserting the battery - Step 1
  2. Insert the size R03 dry battey into the battery compartment matching terminal on the battery to on the compartment.
    Inserting the battery - Step 2
  3. Close the battery compartment lid.
    Inserting the battery - Step 3

Battery life

Battery Approx. hours*1
Sony alkaline battery LR03/AM-4 (N) 60 hours*2
Sony manganese battery R03/UM-4 (NU) 28 hours*2

*1 at 1 kHz, 1 mW+1 mW output
*2 Time stated above may vary, depending on the temperature or conditions of use.

Notes on Battery

  • Do not charge the dry battery.
  • Do not carry the dry battery together with coins or other metallic objects. It can generate heat if the positive and negative terminals of the battery are accidentally come into contact with metallic objects.
  • When you are not going to use the unit for a long time, remove the battery to avoid damage from battery leakage or corrosion.

When to replace the battery

When the battery becomes weak, the power indicator light dims, or sound becomes distorted or noisy. Replace the battery with new ones as soon as possible.

Operating the system
Listening to a program

Before listening

  • The transmitter for the headphones is on the display monitor.
  • To prevent your ears from being damaged, first lower the volume.
  1. Turn on the display monitor.
  2. Turn on the headphones.
    The power indicator on the upper part of the right housing glows red.
  3. Put on the headphones.
    Be sure to put the right housing (R) on your right ear and the left housing (L) on your left ear.
  4. Start playback.
  5. Adjust the volume.
    If the infrared sensors are covered by your hands when adjusting the volume, the attenuate function will be activated and volume may not be adjusted. To adjust the volume, move nearer toward the transmitter or orient the infrared emitters on the left housing towards the transmitter.

Sound is autom atically attenuated if noise increases

Attenuate function

If the infrared rays are obstructed, or the headphones are used outside their effective range, noise will increase and sound will become hard to hear. To avoid potential ear damage as a result of noise, this function attenuates any sound from the headphones. Sound is automatically restored when you move nearer the transmitter or remove the obstruction.

After listening to the programmes

Take off the headphones, and then turn off the power.

Replacing the ear pads

The ear pads are replaceable. If the ear pads become dirty or worn out, replace them as illustrated below.
The ear pad is not commercially available. You can order replacements at your nearest Sony dealer.

  1. Remove the old ear pad by pulling it off.

  2. Place the new ear pad around the housing.
    Place the new ear pad around the housing.


  • The driver must not use the headphones. It may lead to distraction and cause an accident.
  • If the headphones are used while exposed to direct sunlight, sensitivity of the infrared sensors may deteriorate, and inferior quality sound may result.
  • When the headphones are not to be used for a long period of time, remove the battery to avoid damage caused by battery leakage and subsequent corrosion.
  • Do not leave the cordless stereo headphones in a location subject to direct sunlight, heat or moisture. (It is recommended to use the headphones at a of temperature of between 5 ˚C and 35 ˚C.)
  • Do not drop, hit or otherwise subject the headphones to strong shocks of any kind. This could damage the product.

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, lower 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 headphones that are not covered in this manual, please consult nearest Sony dealer.


No sound/Muffled sound

  • Turn on the display monitor first, and then put on the headphones.
  • Check that the display monitor is turned on.
  • The attenuate function is activated.
    • Check if there is any object between the transmitter and the headphones.
    • Use the headphones near the transmitter.
  • The headphones' power indicator light dims, flashes or goes off.
    • Replace dry battery with new one.

Distorted sound

  • The headphones' power indicator light dims, flashes or goes off.
    • Replace dry battery with new one.

Loud backg round noise

  • Move closer to the transmitter. (As you move away from the transmitter, more noise is likely to be heard. This is inherent in infrared ray communication and does not mean that there is a problem with the headphones.)
  • 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.
  • Use the headphones away from the direct sunlight.
  • The headphones' power indicator light dims, flashes or goes off.
    • Replace dry battery with new one.



Modulation system Frequency modulation
Carrier frequency Right 2.8 MHz
Left 2.3 MHz
Frequency response 18 – 22,000 Hz
Power source DC 1.5 V (size R03) dry battery
Mass Approx. 125 g including battery

Supplied accessories

  • Operating instructions (1)

Design and specifications are subject to change without notice.

Documents / Resources

Download manual

Here you can download full pdf version of manual, it may contain additional safety instructions, warranty information, FCC rules, etc.

Download Sony MDR-IF0140 - Cordless Stereo Headphones Manual


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