3-858-950-31(1)
Wireless Stereo
Headphones
Operating Instructions
Mode d’emploi
MDR-RF940R
Sony Corporation © 1997 Printed in Japan
English
(Getting started
Setting up the headphones
1 Open the battery compartment lid on the left inner side of the head band.
2 Insert two R6 (size AA) batteries by matching the + and – on the batteries to the + and – in the battery compartment.
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3 Close the battery compartment lid.
Battery life | Approx. hours |
| |
Sony alkaline battery | 40 |
LR6 (SG) | |
| |
Sony battery R6P (SR) | 20 |
| |
When to replace the batteries
(Operating the system
Listening to a program
1 Select the radio frequency with the CHANNEL selector switch.
Select the same channel on the headphones and the transmitter.
Transmitter
CH1 CH2
2 Turn on the audio/video equipment then the transmitter.
Transmitter
POWER 
3 Put on the headphones and the power turns on automatically.
4 Adjust the volume.
The effective areas of the transmitter
The optimum distance is up to approximately 130 feet (40m) without the system picking up some interference. However, the distance may vary according to the surroundings and environment. If the system picks up some noise while using it within the above mentioned distance, reduce the distance between the transmitter unit and the headphones, or select the other channel.
Notes
•When you use the headphones inside the effective areas of the transmitter, the transmitter can be placed in any direction from the listener.
•Even within the signal reception area, there are some spots (dead point) where the RF signal can not be received. This characteristics is inherent to RF signals, and does not indicate malfunction. By slightly moving the transmitter, location of the dead point can be changed.
Replacing the ear pads
When the ear pads become dirty or damaged, you can get replacements from your Sony dealer. Replace them as illustrated below.
1 Remove the old ear pad by pulling it out of the groove on the housing.
(Additional information
Precautions
•When the headphones are not to be used for a long period of time, remove the batteries to avoid damage caused by battery leakage and subsequent corrosion.
•Do not leave the wireless stereo headphone 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.
Troubleshooting
Problem | Solution |
| |
No sound/ | Turn on the transmitter first, then |
Muffled sound 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. |
| | |
| The mute function is activated. |
| Use the headphones near the |
| transmitter. |
| | |
| Replace both batteries of the |
| headphones. |
| | |
| Replace the batteries in the |
| transmitter if the transmitter is |
| used by battery operation. |
| | |
Distortion | If the transmitter is |
| connectedÊ toÊ theÊ headphones jack, |
| turn down the volume of the |
| connected audio/video |
| equipment. |
| | |
| Replace both batteries of the |
| headphones. |
| | |
| Replace the batteries in the |
| transmitter if the transmitter is |
| used by battery operation. |
| | |
Loud | Move closer to the transmitter. As |
background | you move away from the |
noise | transmitter, more noise is likely to |
| be heard. |
| | |
| If the transmitter is connected to |
| the headphones jack, turn up the |
| volume of the connected audio/ |
| video equipment. |
| | |
| Replace both batteries of the |
| headphones. |
| | |
| Replace the batteries in the |
| transmitter if the transmitter is |
| used by battery operation. |
| | |
| | |
| | |
Note
This device complies with RSS-210 of Industry Canada. 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.
Welcome!
Thank you for purchasing the Sony MDR-RF940R Wireless Stereo Headphones. Before operating the unit, please read this manual thoroughly and retain it for future reference.
Some features are:
•Wireless system that allows you to listen to a program free from the restriction of a cord within 130 feet from the transmitter.
•High fidelity sound reproduction
•Comfortable Circum-aural headphones
•Automatic ON/OFF function on headphones to preserve battery power
•Mute function to avoid noise when no audio signal is available.
Replace both batteries with new ones when the POWER indicator dims, and a hissing noise increases.
Notes on batteries
To avoid damage to the system caused by battery leakage and corrosion;
—Install the batteries with the correct polarity.
—Do not try to recharge the batteries.
—Remove the batteries if the system is not to be used for a long period of time.
In case of battery leakage, wipe off any deposit in the battery compartments before installing new batteries.
Note
If the transmitter is connected to the headphones jack of the source equipment, set the volume of that equipment as high as possible without distorting the audio signal.
Auto power on/off function
When you remove the headphones, the power turns off automatically. Do not apply pressure to the left ear pad when not using the headphones, otherwise the headphones will be switched on.
/
Mute function
If a hissing noise is heard when the headphones are used outside of the effective range (see the next section), the mute function will be activated and the sound will not be heard from the headphones. To restore the sound, move near toward the transmitter.
After listening to a program
Take the headphones off before turning off the transmitter. If you turn off the transmitter first, you may hear some noise.
2 Place the new ear pad on the housing and insert the edge of the pad into the groove as illustrated.
Make sure that the entire edge of the ear pad is securely inserted into the groove.
Specifications
General
Carrier frequency | 913.5 – 914.5 MHz |
Channel | Ch1, Ch2 |
Modulation | FM stereo |
Frequency response | 20 – 20,000 Hz |
Headphones
Power source | DC 3 V: 2 x R6 (size AA) |
| battery |
Mass | Approx. 270 g (9.5 oz.) inc. |
| batteries |
Design and specifications are subject to change without notice.
