Sony MDR-RF450RK User manual

Operating Instructions
Mode d’emploi
Manual de instrucciones
Bedienungsanleitung
Gebruiksaanwijzing
Istruzioni per l’uso
Manual de instruções
Wireless Stereo
Headphone System
3-862-802-12(1)
Sony Corporation © 1998 Printed in Korea
MDR-RF450RK
EN
F
ES
D
NL
I
P

2
WARNING
To prevent fire or shock hazard, do not
expose the unit to rain or moisture.
To avoid electrical shock, do not open the
cabinet. Refer servicing to qualified
personnel only.
Owner’s Record
The model number is located at the bottom of the
transmitter and the left inner side of the
headband.
The serial number is located at the bottom of the
transmitter and in the battery compartment of
the headphones.
Record these numbers in the spaces provided
below. Refer to them whenever you call upon
your Sony dealer regarding this product.
Model No.
Transmitter
Headphones
Serial No.
Transmitter
Headphones
Welcome!
Thank you for purchasing the Sony
MDR-RF450RK Wireless Stereo Headphone
System. 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.
• High fidelity sound reproduction
• Compact transmitter which operates on AC
power using the supplied AC power adaptor
and which also functions as battery charger
• Comfortable Circum-aural headphones with
self adjusting head band
• Automatic ON/OFF function on headphones
to preserve battery power
• Mute function to avoid noise when no audio
signal is available.
• Either supplied rechargeable batteries or
commercially available R6 (size AA) dry
batteries are used for the power source of the
headphone.

3
Notes on receiving
performance
The system for this equipment utilizes very high
frequency signals in the 400 MHz band so the
receiving performance may deteriorate due to the
surroundings. The following examples illustrate
conditions that may reduce the possible receiving
range or cause interference with reception.
• Inside a building with walls containing steel
beams.
• Area with many steel file cabinets, etc.
• Area with many electrical appliances capable
of generating electromagnetic noise.
• Transmitter is placed on a metal instrument.
• Area facing roadways.
• Noise or interfering signals exist in the
surroundings due to radio transceivers in
trucks, etc.
• Noise or interfering signals exist in the
surroundings due to wireless communication
systems installed along roadways.
Table of contents
Getting started
Unpacking ............................................... 4
Charging the headphones’ batteries.... 4
Setting up the headphones ................... 6
Setting up the transmitter ..................... 7
Operating the system
Listening to a program .......................... 9
The effective areas of the
transmitter ...................................... 10
Replacing the ear pads ........................ 11
Additional information
Precautions ............................................ 11
Troubleshooting ................................... 12
Specifications ........................................ 13
EN

4
(Getting started
Unpacking
Check that you have the following items:
• The transmitter
• Ni-Cd rechargeable batteries NC-AA-HJ
• AC power adaptor
• The headphones
• Unimatch plug adaptor (stereo mini jack ˜
stereo phone plug)
• Connecting cord (phono plugs ˜stereo mini
plug), 1 m
Charging the
headphones’ batteries
Using the headphones for the first time
The headphones are powered by either supplied
rechargeable batteries or commercially available
R6 (size AA) batteries.
When you use the headphones with the supplied
rechargeable batteries NC-AA-HJ for the first
time, charge the batteries in the following
manner.
NC-AA-HJ is applicable only for Sony cordless/
wireless headphone systems. Never use for any
other purpose.
1Press the OPEN button to open the
battery compartment lid of the
transmitter.
2Insert two NC-AA-HJ batteries
supplied by matching the ]and }on
the batteries to the ]and }in the
battery compartment.
3Close the battery compartment.

5
4Connect the transmitter to a power
source.
5Press the OFF/CHG•POWER ON
switch so that the OFF/CHG indicator
lights up green.
Charging starts.
Notes
•Charge only the supplied rechargeable batteries
NC-AA-HJ.
•You cannot recharge other R6 (size AA) rechargeable
batteries (NC-AA etc.) with this unit.
•Be sure to charge both the rechargeable batteries at a
time. The charger cannot charge the batteries one by
one.
•Use only the supplied AC power adaptor. Do not use
any other AC power adaptor.
Polarity of the plug
If the indicator is not lit
Check that the supplied rechargeable batteries
are correctly inserted in the battery compartment
of the transmitter.
To recharge the headphones’ batteries
after use
To charge the batteries, follow steps above.
Since little electric current is used for charging,
there is no need to worry about overcharging.
Charging and using hours
* at 1 kHz, 1 mW + 1 mW output
** The hours required to fully charge empty batteries
Transmitter
to an AC outlet
To DC IN
9 V jack
AC power adaptor
(supplied)
Approx. charging
hours
1
24**
Approx. using time*
50 minutes
20 hours

6
Setting up the
headphones
1Open the battery compartment lid on
the left outer side of the head band.
2Insert two charged NC-AA-HJ batteries
by matching the ]and }on the
batteries to the ]and }in the battery
compartment.
3Close the battery compartment lid.
Using the headphones with a
commercially available R6 (size AA) dry
batteries
Install the batteries in the manner as described in
“Setting up the headphones.”
Battery life
* at 1 kHz, 1 mW + 1 mW output
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 dry 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.
Check the remaining power of the
headphones’ battery
Pull up the self adjusting band, and check that
the headphones’ power indicator lights in red.
You can now use the headphones.
Charge the battery or install a new dry battery, if
the power indicator light is weak or turned off
and the sound become distorted or has a lot of
noise.
Notes
•During recharging, the transmitter is turned off.
•When the life of the rechargeable batteries are
shortened by half even after a proper recharging,
replace them with new NC-AA-HJ batteries.
Approx. hours*
60
30
Battery
Sony alkaline battery
LR6 (SG)
Sony battery R6P (SR)

7
bTo connect to LINE OUT or REC OUT
jacks
Setting up the
transmitter
1Connect the transmitter to audio/video
equipment. Select one of the hookups
below depending on the jack type:
aTo connect to a headphones jack
Transmitter
Right channel
(red) Left channel (white)
Unimatch plug
adaptor
(supplied)
Discman, MD,
WALKMAN*, VCR,
etc.
to headphones
jack (stereo
mini jack)
Connecting cord
(supplied)
to AUDIO IN
A jacks
to headphones
jack (stereo
phone jack)
Transmitter
to AUDIO IN
B jack
Connecting cord
(supplied)
Right channel
(red)
Left channel
(white)
to LINE OUT or REC
OUT jacks
Stereo system, VCR,
etc.
continue to next page

8
cTo connect to TV etc.
If noise occurs when the transmitter is
connected to your TV or VCR, set the
NOISE FILTER switch to ON.
Notes
• If you connect the transmitter to LINE OUT or
REC OUT jack of an audio reproducer such as an
MD player or CD player, do not set the NOISE
FILTER switch to ON. Otherwise, the volume will
be limited.
• The NOISE FILTER switch effects the sound only
in cases such as connection diagram c. In
diagrams aand bon page 7, the switch has no
effect.
• When the transmitter is placed on or near a TV, it
may pick up a noise.
In such case, place the transmitter away from the
TV.
TV, etc.
to stereo mini jack
Transmitter to AUDIO IN
A jack
Left channel
(white)
Right channel
(red)
Connecting cord
(supplied)
2Connect the transmitter to an AC outlet
using the supplied AC power adaptor.
Notes
•Use only the supplied AC power adaptor. Do not use
any other AC power adaptor.
Polarity of the plug
•When you connect the connecting cord directly to an
earphone jack, the audio signal will not be output
through the right channel. In such a case, use the
separately sold PC-236HG plug adaptor.
•If the connected equipment has the AVLS (Automatic
Volume Limiter System) function, be sure to turn the
function off when using the transmitter. Otherwise,
you will have to turn up the volume of the
headphones, and that may cause noise.
* WALKMAN is a registered trademark of Sony
Corporation.
Continued

9
(Operating the system
Listening to a program
1First turn on the audio/video
equipment, then turn on the
transmitter.
2Select the radio frequency with the
CHANNEL selector switch.
3Put on the headphones and the power
turns on automatically.
4Turn up the volume to a moderate level
with the VOL control, then tune the
headphones in to the frequency of the
transmitter with the TUNING control
until you can hear the audio signal
loud and clear.
1
2
Try the above steps 2 and 4 until the
receiving performance becomes better.
Sending RF signals from the Transmitter
The transmitter starts sending the RF signals
automatically, when it detects audio signals from
the equipments connected.
If it does not detect an audio signal for more than
approximately one minute, the transmitter will
stop sending RF signals.
But the Power indicator remains lighting. When
the transmitter receives an audio signal again, it
starts sending the RF signals.
If the audio signal is very weak, the transmitter
does not send RF signals automatically. In this
case, make sure the volume of the equipments
connected is set to 5 – 6.
You may not hear the beginning of the sound
from the headphones until the transmitter starts
sending the RF signals after detecting an audio
signal.
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 allow the self
adjusting band to be pulled up, otherwise the
headphones will be switched on.
The power turns on. The power turns off.
continue to next page
VOL control
TUNING control

10
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 and rest them away on
the holder of the transmitter as shown below.
Note
Do not hang the headphones by the self adjusting band,
otherwise, the self adjusting band will be pulled up and
the headphones will be switched on.
The effective areas of
the transmitter
The optimum distance is up to approximately
100 m 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 spot) 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 spot can be
changed.
Self adjusting
band
Holder
Continued

11
(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.
• When the transmitter is not to be used for a
long period of time, disconnect the AC power
adaptor from the AC outlet holding the plug.
Do not pull on the cord.
Also remove the batteries to avoid damage
caused by battery leakage and subsequent
corrosion.
• Do not leave the wireless stereo headphone
system 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.
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.
1Remove the old ear pad by pulling it
out of the groove on the housing.
2Place the new ear pad on the driver
unit 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.

12
Problem
Distortion
Loud
background
noise
Solution
If the transmitter is
connected to the headphones jack,
turn down the volume of the
connected audio/video equipment.
Select the radio frequency with the
CHANNEL selector.
The headphones’ POWER indicator
light is weak or turned off.
•Charge the rechargeable batteries or
if the POWER indicator is still off
after charging the batteries, replace
them with new
NC-AA-HJ batteries.
•If you are using the conventional
dry batteries, replace it with new
ones.
If you connect the transmitter to LINE
OUT or REC OUT jack of an audio
reproducer, make sure that the NOISE
FILTER switch is set to OFF.
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.
Select the radio frequency with the
CHANNEL selector, then tune in the
frequency of the transmitter with the
TUNING control.
The headphones’ POWER indicator
light is weak or turned off.
•Charge the rechargeable batteries or
if the POWER indicator is still off
after charging the batteries, replace
them with new
NC-AA-HJ batteries.
•If you are using the conventional
dry batteries, replace it with new
ones.
If you connect the transmitter to LINE
OUT or REC OUT jack of an audio
reproducer, make sure that the NOISE
FILTER switch is set to OFF.
Problem
No sound/
Muffled
sound
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.
Select the radio frequency with the
CHANNEL selector, then tune in the
frequency of the transmitter with the
TUNING control.
The mute function is activated.
Use the headphones near the
transmitter.
The headphones’ POWER indicator
light is weak or turned off.
•Charge the rechargeable batteries or
if the POWER indicator is still off
after charging the batteries, replace
them with new
NC-AA-HJ batteries.
•If you are using the conventional
dry batteries, replace it with new
ones.
If you connect the transmitter to LINE
OUT or REC OUT jack of an audio
reproducer, make sure that the NOISE
FILTER switch is set to OFF.
Troubleshooting

13
Specifications
General
Carrier frequency
433.40 – 434.40 MHz
Channel Ch1, Ch2, Ch3
Modulation FM stereo
Frequency response
18 – 22,000 Hz
Transmitter
Power source DC 9 V: supplied AC power
adaptor
Audio input phono jacks/stereo mini jack
Dimensions Approx. 120 mm dia ×290 mm
(4 3/4×11 1/2in.) (w/h)
Mass Approx. 155 g (5.5 oz.)
Headphones
Power source DC 3 V: 2 ×R6 (size AA) battery
or 2 ×supplied
NC-AA-HJ Ni-Cd
rechargeable battery
Mass Approx. 265 g (9.4 oz.) incl.
Ni-Cd batteries
Supplied Ni-Cd rechargeable batteries
Model name NC-AA-HJ
Voltage 1.2 V
Capacity 600 mAh
Optional accessories
Ni-Cd rechargeable battery
NC-AA-HJ
Plug adaptor PC-236HG (stereo mini jack ˜
monaural mini plug)
Design and specifications are subject to change without
notice.
Solution
The dry batteries are installed.
•Install the supplied rechargeable
batteries.
The rechargeable batteries other than
NC-AA-HJ are installed.
•Install NC-AA-HJ rechargeable
batteries.
Turn up the volume moderately, then
tune in the frequency.
Problem
The batteries
cannot be
charged.
Incapable
of the tuning

14
AVERTISSEMENT
Afin d’éviter tout risque d’incendie ou
d’électrocution, ne pas exposer cet
appareil à la pluie ou à l’humidité.
Afin d’écarter tout risque d’électrocution,
garder le coffret fermé. Ne confier
l’entretien de l’appareil qu’à un
professionnel.
Bienvenue!
Nous vous félicitons pour l’achat de ce système
de casque stéréo infrarouge Sony
MDR-RF450RK. Avant la mise en service de cet
appareil, prière de lire attentivement ce mode
d’emploi et de le conserver pour toute référence
ultérieure.
Cet appareil offre, entre autres, les
caractéristiques suivantes:
• Système infrarouge permettant d’écouter un
programme sans l’inconvénient d’un cordon.
• Reproduction sonore de haute fidélité.
• Transmetteur compact fonctionnant sur le
secteur avec l’adaptateur secteur fourni.
L’adaptateur peut servir également de
chargeur.
• Casque d’écoute confortable circum-aural avec
serre-tête s’adaptant automatiquement à la
tête.
• Mise sous/hors tension (ON/OFF)
automatique pour économiser l’énergie des
piles.
• Fonction de silencieux pour éviter les bruits en
l’absence de signaux audio.
• Piles rechargeables fournies ou piles sèches R6
(format AA) disponibles dans le commerce
pour l’alimentation du casque.

15
Remarques sur les
performances de
réception
Comme le système de cet appareil utilise des
signaux de très haute fréquence dans la gamme
de 400 MHz, l’environnement peut avoir une
influence sur la qualité de la réception. Les
exemples suivants illustrent les situations
pouvant réduire la plage de réception et
perturber la réception.
• A l’intérieur d’un bâtiment à structure
métallique.
• Pièce contenant de nombreux classeurs à
tiroirs métalliques.
• A proximité d’appareils électriques pouvant
engendrer des parasites électromagnétiques.
• Installation sur un instrument métallique.
• A proximité d’une route.
• Parasites ou interférences dans le voisinage,
provenant d’émetteurs-récepteurs de camions,
etc.
• Parasites ou interférences dans le voisinage,
provenant de systèmes de communication,
installés le long de routes.
Table des matières
Préparatifs
Déballage ............................................... 16
Recharge des piles du casque ............. 16
Préparation du casque......................... 18
Raccordement du transmetteur.......... 19
Utilisation du système
Ecoute d’un programme ..................... 21
Portée du transmetteur........................ 22
Remplacement des oreillettes............. 23
Informations complémentaires
Précautions ............................................ 23
Guide de dépannage ............................ 24
Spécifications ........................................ 25 F

16
(Préparatifs
Déballage
Vérifiez que tous les éléments suivants se
trouvent dans l’emballage:
• Transmetteur
• Piles rechargeables Ni-Cd NC-AA-HJ
• Adaptateur secteur
• Casque
• Adaptateur de fiche universel (minijack stéréo
˜fiche Cinch stéréo)
• Cordon de liaison (fiches cinch ˜minifiche
stéréo), 1 m
Recharge des piles du
casque
Lorsque vous utilisez le casque pour la
première fois
Le casque peut être alimenté par les piles
rechargeables fournies ou des piles sèches R6
(taille AA) en vente dans le commerce.
Lorsque vous utilisez pour la première fois le
casque avec les piles rechargeables fournies NC-
AA-HJ, insérez les piles de la façon suivante.
Les piles NC-AA-HJ ne doivent être utilisées
qu’avec les systèmes de casque sans fil/
infrarouge Sony. Ne pas les utiliser dans
d’autres buts.
1Appuyez sur la touche OPEN pour
ouvrir le couvercle du logement des
piles du transmetteur.
2Insérez les deux piles
NC-AA-HJ fournies en faisant
correspondre les pôles ]et }des piles
aux indications ]et }dans le
logement.
3Fermez le logement des piles.

17
4Raccordez le transmetteur à une source
d’alimentation.
5Réglez le commutateur OFF/
CHG•POWER ON de sorte que le
voyant OFF/CHG s’allume en vert. La
recharge commence.
Remarques
•Ne rechargez que les piles fournies NC-AA-HJ.
•Vous ne pouvez pas recharger des piles R6 (format
AA) ou d’autres types de piles rechargeables (NC-AA,
etc.) avec cet appareil.
•Veillez à recharger les deux piles en même temps. Le
chargeur ne peut pas recharger une seule pile à la fois.
•N’utilisez que l’adaptateur secteur fourni à l’exclusion
de tout autre.
Polarité de la fiche
Si le voyant ne s’allume pas
Vérifiez si les piles rechargeables fournies sont
installées correctement dans le logement du
transmetteur.
Pour recharger les piles du casque après
utilisation
Pour recharger les piles, effectuez les opérations
précédentes.
Comme le courant utilisé pour la recharge est
très faible, il n’y a pas de problème de surcharge.
Temps de recharge et d’utilisation
* Sortie de 1 mW + 1 mW, à 1 kHz
** Temps requis pour une recharge complète de piles
vides.
Transmetteur
à une prise
secteur
à la prise
DC IN 9 V
Adaptateur secteur
(fourni)
Temps de recharge
approximatif
1
24**
Temps d’utilisation
approximatif*
50 minutes
20 heures

18
Préparation du casque
1Ouvrez le couvercle du logement des
piles sur la gauche, à l’extérieur du
serre-tête.
2Insérez deux piles chargées
NC-AA-HJ en faisant correspondre les
pôles ]et }des piles avec les
indications ]et }dans le logement.
3Fermez le couvercle du logement.
Utilisation du casque avec des piles
sèches R6 (format AA) en vente dans le
commerce
Installez les piles de la manière indiquée dans
“Préparation du casque”.
Autonomie des piles
* Sortie de 1 mW + 1 mW, à 1 kHz
Remarques sur les piles
Pour éviter tout dommage dû à l’écoulement de
l’électrolyte et à la corrosion:
– Installez les piles dans le bons sens.
– N’essayez pas de recharger les piles.
– Enlevez les piles si vous ne comptez pas
utiliser le système pendant un certain temps.
En cas de fuite des piles, essuyez bien le
logement avant d’installer des piles neuves.
Vérifiez la capacité restante des piles du
casque
Tirez le serre-tête auto-adaptable et vérifiez que
le témoin d’alimentation du casque s’allume en
rouge. Vous pouvez alors utiliser le casque.
Chargez les piles ou installez des piles sèches
neuves, si le témoin d’alimentation luit
faiblement ou s’éteint, et si le son est déformé ou
extrêmement parasité.
Remarques
•Pendant la recharge, le transmetteur s’éteint.
•Si l’autonomie des piles rechargeables est réduite
même après une recharge complète, remplacez-les par
des neuves NC-AA-HJ.
Piles
Piles alcalines Sony LR6
(SG)
Piles Sony R6P (SR)
Env. en heures*
60
30

19
Raccordement du
transmetteur
1Raccordez le transmetteur à l’appareil
audio/vidéo. Sélectionnez une des
liaisons suivantes selon le type de prise:
aRaccordement à une prise de casque
bRaccordement aux prises LINE OUT ou
REC OUT
Discman, MD,
WALKMAN*,
Magnétoscope,
etc.
Adaptateur de
fiche universel
(fourni)
à la prise de
casque
(minijack stéréo)
Transmetteur
à la prise de casque
(minijack stéréo)
Cordon de liaison
(fourni)
aux prises LINE OUT
ou REC OUT
Canal droit
(rouge) Canal gauche (blanc)
Transmetteur
Chaîne stéréo,
Magnétoscope, etc.
aux prises
AUDIO IN A
Canal droit
(rouge)
Canal gauche
(blanc)
Cordon de liaison
(fourni)
aux prises
AUDIO IN B
Voir page suivante

20
cPour raccorder un téléviseur, etc.
Si des parasites sont audibles quand le
transmetteur est relié au téléviseur ou
magnétoscope, réglez le commutateur
NOISE FILTER sur ON.
Remarques
• Si vous raccordez le transmetteur à la prise LINE
OUT ou REC OUT d’un lecteur MD ou d’un
lecteur CD, ne réglez pas le commutateur NOISE
FILTER sur ON, sinon le volume sera limité.
• Le commutateur NOISE FILTER n’agit sur le son
que dans les cas de liaison du schéma c. Dans les
cas de liaison aet bde la page 19, il n’a aucun
effet.
• Si le transmetteur est placé à proximité ou sur un
téléviseur, il peut capter du bruit.
Dans ce cas, éloignez-le du téléviseur.
Transmetteur
Téléviseur, etc.
au minijack stéréo
suite
Canal droit
(rouge) Canal gauche (blanc)
aux prises
AUDIO IN A
Cordon de liaison
(fourni)
2Branchez le transmetteur sur une prise
secteur à l’aide de l’adaptateur secteur
fourni.
Remarques
•Utilisez uniquement l’adaptateur secteur fourni à
l’exclusion de tout autre.
Polarité de la fiche
•Quand vous raccordez directement le cordon de
liaison à une prise de casque, le signal audio ne sort
pas du canal droit. Dans ce cas, utilisez l’adaptateur de
fiche PC-236HG vendu séparément.
•Si l’appareil raccordé présente la fonction AVLS
(système de limitation automatique du volume),
désactivez cette fonction quand vous utilisez le
transmetteur, sinon vous devrez augmenter le volume
du casque, ce qui provoquera du bruit.
* WALKMAN est une marque déposée de Sony
Corporation.