Sony MDR-NC7 Operating Instructions

Noise Canceling
Headphones
MDR-NC7
© 2008 Sony Corporation Printed in Malaysia
English
2
Push the OPEN button to open the battery
WARNING
lid.
To reduce the risk of fi re or electric
shock, do not expose this apparatus
to rain or moisture.
To reduce the risk of electrical
shock, do not open the cabinet.
Refer servicing to qualifi ed
personnel only.
This device complies with Part 15 of the FCC Rules.
3
Operation is subject to the following two conditions:
Insert one R03 (size AAA) battery by
(1) This device may not cause harmful interference,
matching the e on the battery to the e
and (2) this device must accept any interference
in the battery case.
received, including interference that may cause
undesired operation.
You are cautioned that any changes or modifi cations
not expressly approved in this manual could void
your authority to operate this equipment.
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).
4
Close the lid.
Features
• Noise canceling headphones reduce unwanted
ambient noise, providing a quieter environment to
enhance your listening experience. A microphone
inside each earpad works with an electronic circuit
to create an opposite sound wave to cancel out the
noise.
• Foldable and swivel design for easy portability.
• Dual use capability allows option to listen to music
Battery life
with or without noise cancellation.
Battery
• Neodymium magnet delivers powerful sound.
• Supplied plug adaptor for easy connectivity to
stereo or dual jack for in-fl ight music services. Sony alkaline battery
LR03 SIZE AAA
Sony manganese battery
R03 SIZE AAA
Installing a
* 1 1 kHz, 0.1 mW + 0.1 mW output
* 2 Time stated above may vary, depending on the
battery
temperature or conditions of use.
Note
1
Rotate the left housing as illustrated.
Because the supplied battery was included in
the package from the time of manufacture (as a
convenience to the user), it is possible that the
battery life may be somewhat depleted by the time of
purchase. The actual life of the supplied battery may
be shorter than the standard time described in this
manual when using a fresh battery.
When to replace the battery
Replace the battery with a new one when the
POWER indicator dims. The noise canceling
feature may not work correctly if battery power
is low.
If the battery lid is detached
Attach it as illustrated.
4-111-700-21 (1)
Listening to
music
1
Connect the headphones to the AV
Operating Instructions
equipment.
Manual de instrucciones
(1)
Remote commander
* "WALKMAN" and "WALKMAN" logo are
registered trademarks of Sony Corporation.
2
Turn on the power of the headphones.
The POWER indicator lights in red.
When the power is turned on, ambient
noise is reduced, and you can listen to
music more clearly at a lower volume.
Insert the E end
fi rst.
Note
The noise canceling microphone is built inside each
earpad. Do not put weight or force on the microphone
as it may damage the microphone.
3
Wear the headphone marked R on your
right ear and the one marked L on your
left ear.
Approx.
hours ∗
1
2
50 hours*
25 hours* 2 4
Turn on the power of the AV equipment.
When using in an airplane
• The supplied plug adapter can be connected to the
dual or stereo mini jacks in an airplane.
for dual jacks
• Do not use the headphones when use of electronic
equipment is prohibited or when use of personal
headphones for in-fl ight music services is
prohibited.
If you have any questions or problems concerning
the system that are not covered in this manual,
please consult the nearest Sony dealer.
After listening to music
Turn off the power of the headphones.
+
_
Folding the
headphones
Rotate the housings to make them fl at for
easy storage in the seat pocket.
Restore to their usual position before using.
When connecting to dual or
stereo mini jacks of in-fl ight
music services.
Plug adaptor
(supplied)
To headphone jacks
on airplane seats
Fold the headphones as illustrated for easy
storage in the carrying pouch (supplied).
When connecting to the
headphone jack (stereo
mini jack) of a
WALKMAN ®*, etc.
When connecting to a
remote commander with
a stereo mini jack of a
WALKMAN ®*, etc.
Precautions
The headphones contain a noise canceling circuit.
What is noise canceling?
The noise canceling circuit actually senses outside
noise with built-in microphones and sends an equal-
but-opposite canceling signal to the headphones.
• The noise canceling effect may not be pronounced
in a very quiet environment, or some noise may be
heard. In such a case, turn the POWER switch off.
• The noise canceling effect may vary depending on
how you wear the headphones.
• When you turn the POWER switch on, the
operation sound of the noise canceling may be
noticeable. This is not a malfunction.
• The noise canceling function is only effective for
noise in the low frequency band. Although noise
is reduced, it is not canceled completely.
• When you use the headphones in a train or a car,
noise may occur depending on street conditions.
In such a case, turn the POWER switch off.
• You can use the headphones without turning
on the power. In this case, the noise canceling
function is not active, and the headphones operate
as passive headphones.
• Howling may occur if you do not wear the
headphones correctly.
• Howling may occur if you place an object such as
fi nger close to the noise canceling microphone.
Keep it away from the microphone.
• Mobile phones may cause interference and
noise. To avoid interference, use noise canceling
feature only with wireless transmitters turned
off (Airplane Mode). Interference noise can also
occur from nearby mobile phones. Should this
occur, locate the headphones further away from
the mobile phone.
Notes on usage
• Clean the headphones with a soft dry cloth.
• Do not leave the plug dirty otherwise the sound
may be distorted.
• Be sure to consult a Sony dealer when the
earpads become dirty or damaged, or when the
headphones require repair work.
• Do not leave the stereo headphones in a location
subject to direct sunlight, heat or moisture.
for stereo mini jack
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.
Do not use headphones while driving and
cycling, etc.
As headphones reduce outside sounds, they may
cause a traffi c accident. Also, avoid listening with
your headphones in situations where hearing must
not be impaired, for example, a railroad crossing, a
construction site, etc.

Troubleshooting

No sound
• Check the connection of the headphones and the
AV equipment.
• Check that the connected AV equipment is
turned on.
• Turn up the volume of the connected AV
equipment.
• Replace the battery.
Muffl ed sound
• Turn down the volume of the connected AV
equipment.
• Replace the battery.
Power does not turn on
• Check if the battery has expired (the POWER
indicator dims). Replace the battery with a new
one.
Howling
• Make sure you are wearing the headphones
correctly.
Specifi cations
General
Type Closed, dynamic
Driver unit 30 mm, dome type (CCAW
adopted)
Power handling capacity
100 mW
33 Ω at 1 kHz
Impedance
(when the power is on)
35 Ω at 1 kHz
(when the power is off)
Sensitivity 102 dB/mW
(when the power is on)
100 dB/mW
(when the power is off)
Frequency response
30 – 20,000 Hz
1
Total Noise Suppression Ratio*
Approx. 9 dB* 2
Cord Approx. 1.5 m (59 1 / in) OFC
8
litz cord
DC 1.5 V, 1 × R03 (size AAA)
Power source
battery
Mass Approx. 134 g (4.7 oz)
including battery
Supplied accessories
Sony R03 (size AAA) battery (1)
Carrying pouch (1)
Plug adaptor for in-fl ight use* 3 (single/dual) (1)
Operating Instructions (1)
* 1 Under the Sony measurement standard.
* 2 Equivalent to approx. 87.4 % reduction of energy
of sound compared with not wearing headphones.
* 3 May not be compatible with some in-fl ight music
services.
Design and specifi cations are subject to change
without notice.