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Operating Instructions
Mode d’emploi
Sony Corporation © 1997 Printed in Japan
MDR-RF940R
3-858-950-31(1)
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.
( 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.
3 Close the battery compartment lid.
Battery life
When to replace the batteries
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.
Wireless Stereo
Headphones
Approx. hours
40
20
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.
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.
Troubleshooting
Problem
No sound/
Muffled sound
Distortion
Loud
background
noise
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.
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.
If the transmitter is
connected␣ to␣ the␣ 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.
Move closer to the transmitter. As
you move away from the
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.
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.
Transmitter
CH2CH1
Transmitter
POWER
/
( 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.
2 Turn on the audio/video equipment
then the transmitter.
3 Put on the headphones and the
power turns on automatically.
4 Adjust the volume.
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.
( 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.
English
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.
]
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