Sony MDR-IF140K User manual

Cordless Stereo
Headphone
System
© 2009 Sony Corporation
Operating Instructions
3-248-366-62(1)
MDR-IF140K
CS
CT
GB
KR

2GB
WARNING
To prevent fire or shock
hazard, do not expose the unit
to rain or moisture.
To prevent fire or shock hazard, do not
place objects filled with liquids, such as
vases, on the apparatus.
To avoid electrical shock, do not open
the cabinet. Refer servicing to qualified
personnel only.
Do not install the appliance in a
confined space, such as a bookcase or
built-in cabinet.
The validity of the CE marking is
restricted to only those countries where
it is legally enforced, mainly in the
countries EEA (European Economic
Area).

3GB
Welcome!
Thank you for purchasing the Sony
MDR-IF140K Cordless Stereo
Headphone System. Before operating
the unit, please read this manual
thoroughly and retain it for future
reference.
The MDR-IF140K is a cordless stereo
headphone system using infrared
transmission. You can enjoy listening to
a programme free from the restriction
of the headphones cord by simply
connecting the transmitter to a TV, or
audio components equipped with a
headphones jack or a line output jack.
•Cordless, noiseless infrared headphone
system resistant to external noise, etc.
•Wide infrared reception range of up to 7 m
(23 ft.).
•Self-adjusting headband mechanism
eliminating the need for headband
adjustment.
•Single VOL control adjusts both the right
and left volume of the headphones.
Table of contents
Getting started
Unpacking ........................................... 4
Inserting the battery .......................... 5
Setting up the transmitter ................. 6
Operating the system
Listening to a programme ................ 8
The effective area of the
transmitter ..................................... 10
Replacing the ear pads .................... 10
Additional information
Specifications .................................... 11
Precautions ....................................... 12
Troubleshooting ............................... 13 GB

Getting started
4GB
NGetting started
Unpacking
Check that you have the following
items before using the headphones:
• The transmitter TMR-IF130 (1)
• AC power adaptor (1)
• Connecting cord (1)
(phono plugs h stereo mini plug)
• Unimatch plug adaptor (1)
(stereo mini jack h stereo phone
plug)
• The headphones MDR-IF140 (1)

Getting started 5GB
Inserting the
battery
1Open the battery compartment
lid of the left housing.
2Insert the size AAA dry battery
into the battery compartment
matching 3terminal on the
battery to 3in the
compartment.
3Close the battery compartment
lid.
Battery life
*1at 1 kHz, 1 mW+1 mW output
*2Time stated above may vary, depending
on the temperature or conditions of use.
Notes on Batteries
•Do not charge a dry battery.
•Do not carry a 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 one as soon as
possible.
Battery
Sony alkaline
battery LR03/
AM-4(N)
Sony manganese
battery R03/UM-4
(NU)
Approx. hours*1
60 hours*2
28 hours*2

Getting started
6GB
RLINE IN
DC IN 9V
L
PHONES IN
Setting up the
transmitter
The transmitter is equipped with two
input jacks, which allows for connection
to the specified output jacks: PHONES
IN to the headphones jack, and LINE IN
to the LINE OUT jacks of your
connected equipment.
1Connect the transmitter to an
audio/video component.
Select method Aor B, according
to the output jack type of the AV
component you use.
*WALKMAN is a registered trademark of
Sony Corporation.
Transmitter
Unimatch plug
adaptor (supplied)
WALKMAN*, TV,
VCR, etc.
AWhen connecting to a
headphones jack
Connect to the PHONES IN jack on
the transmitter.
Connecting cord
(supplied)
to PHONES IN jacks
to headphones jack
(stereo mini jack)
to headphones jack
(stereo phone jack)
Left channel
(white)
Right channel
(red)

Getting started 7GB
Note
If your AV component has a stereo mini jack
(LINE OUT), connect the stereo mini jack to
LINE IN jack of the transmitter by using the
connecting cord RK-G136 sold separately. If
you connect LINE OUT jack of your AV
component to PHONES IN jack of the
transmitter, volume may be too low.
BWhen connecting to any jacks
other than the headphones jack
Connect to the LINE IN jacks on the
transmitter.
2If your AC power adaptor is
equipped with a voltage
selector, set it to the operating
voltage in your area with a
screw driver before connecting
the AC power adaptor to an AC
outlet.
3Connect the transmitter to the
power source.
(Continued)
RLINE IN
DC IN 9V
L
PHONES IN
Transmitter
to LINE IN jack
Right channel
(red)
Left channel
(white)
to any jacks other
than headphones jack
Connecting cord
(supplied)
Stereo, TV, VCR, etc.
RLINE IN
DC IN 9V
L
PHONES IN
to DC IN 9
V jack
Transmitter
to an AC
outlet
AC power
adaptor
(supplied)

Operating the system
8GB
NOperating the system
Listening to a
programme
Before listening
To prevent your ears from being
damaged, first lower the volume.
1Turn on the audio/video
component connected to the
transmitter.
When the audio signal is input, the
transmitter turns on automatically
and the infrared emitters glow. If
the transmitter is connected to the
headphones jack, set the volume
control of the audio source
component as high as possible but
not so high that the audio signal
becomes distorted.
2Turn on the headphones.
The power indicator on the upper
part of the right housing glows red.
3Put on the headphones.
Be sure to put the right housing (R)
on your right ear and the left
housing (L) on your left ear.
Notes
•Do not connect to the PHONES IN jack and
LINE IN jack at the same time. If you
connect two audio/video components to
both jacks at the same time, both of the
audio signals may result in mixed output.
•Use only the supplied AC power adaptor.
Do not use any other AC power adaptor.
•When you connect the connecting cord
directly to a headphones jack (monaural
mini jack), the audio signal may not be
output through the right channel. In such a
case, use the separately sold PC-236MS
plug adaptor (stereo mini jack h
monaural mini plug) between the
connecting cord and the headphones jack.
Unified
polarity plug

Operating the system 9GB
4Start playback of the
component connected to the
transmitter.
5Adjust the volume.
If the infrared sensors are covered
by your hands when adjusting the
volume, the mute function will be
activated and volume may not be
adjusted. In this case, move nearer
toward the transmitter or orient the
infrared emitters on the left housing
towards the transmitter.
After listening to the
programmes
Take off the headphones, and then turn
off the power.
Note
You may hear some noise when you
disconnect the AC power adaptor from the
transmitter before taking off the headphones.
Sound is automatically muted if
noise increases
— Mute 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 mute any sound
from the headphones. Sound is
automatically restored when you move
nearer the transmitter or remove the
obstruction.
If no audio signal is input for
more than approximately 5
minutes
The transmitter turns off automatically.
Note
The brightness of the infrared emitters may
not be uniform, however, this is not a
malfunction.

Operating the system
10GB
The effective area
of the transmitter
The illustration below shows the
approximate area covered by the
infrared rays emitted from the
transmitter.
Notes
•If you use the headphones at too great a
distance from the transmitter, you may
hear a hissing noise and if there is an
object between the headphones and the
transmitter, sound may be interrupted.
These phenomena are inherent to infrared
ray communication and do not mean that
there is a problem with the system itself.
•Do not cover the infrared sensors with
your hands or hair.
•When you use the headphones inside the
area in the illustration above, the
transmitter can be placed in front, behind
or by the side of you.
• The noise you may 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.
•Do not use this system in areas exposed to
direct sunlight or strong light. The sound
may be interrupted.
•Plasma displays may interfere with normal
operation of this system.
45°
45°
Transmitter
Infrared ray
Approx. 3 m
(118 1/8in.)
Approx. 3 m
(118 1/8in.)
Approx. 7 m
(23 ft.)
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
from the store where you purchased
this system, or at your nearest Sony
dealer.
1Remove the old ear pad by
pulling it off.
2 Place the new ear pad around
the housing.