Sony MDR-RF875RK User Manual

3-222-709-14(1)

Wireless Stereo
Headphone System

Operating Instructions

MDR-RF875RK

© 2000 Sony Corporation

WARNING

Welcome!

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.

Hereby, Sony Corp., declares that this equipment is
in compliance with the essential requirements and
other relevant provisions of Directive 1999/5/EC.

For details, please access the following URL :
http://www.compliance.sony.de/

This product is intended to be used in the
following countries.
CEK version: United Kingdom
CED version: Germany, Sweden, Denmark,

Finland, Norway, Belgium,
Switzerland, Austria, Netherlands,
France

Thank you for purchasing the Sony
MDR-RF875RK 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

•A compact transmitter with an AC power
adaptor (supplied) enables simple charging of
the headphone battery. Just by placing the
headphones on the transmitter, headphone
battery can be charged.

• Comfortable Circum-aural headphones with
self-adjusting head band

• Automatic ON/OFF function on headphones
to preserve battery power

To check for version, please refer to the barcode
label located on the top of the box.

2

Notes on receiving

Table of contents

performance

The system for this equipment utilizes very high
frequency signals in the 800 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 a roadway.

• Noise or interfering signals exist in the
surroundings due to radio transceivers in
trucks, etc.

• Noise or interfering signals exist in the
surroundings owing to wireless
communication systems installed along
roadways.

Getting started

Unpacking ...................................................... 4

Setting up the transmitter ............................ 4

Charging the headphone battery ................ 6

Operating the system

Listening to a program ................................. 7

The effective areas of the transmitter ......... 9

Replacing the ear pads .................................9

Additional information

Precautions ...................................................10

Troubleshooting ..........................................10

Specifications ...............................................11

3

N Getting started

Setting up the

Unpacking

Check that you have the following items:

• The headphones

• The transmitter

• AC power adaptor

• Unimatch plug adaptor (stereo mini jack y
stereo phone plug)

transmitter
1 Connect the transmitter to audio/video

equipment. Select one of the hookups
below depending on the jack type:

A To connect to a headphone jack

Transmitter

OFF ON

FILTERNOISE

Right channel
(red)

Connecting cord
(supplied)

RBAL

AUDIO IN

to AUDIO IN
A jacks

DC IN 9V

123

CHANNEL

Left channel
(white)

• Connecting cord (phono plugs y stereo mini
plug), 1 m

4

Unimatch plug
adaptor
(supplied)

to headphones
jack (stereo
phone jack)

to headphones
jack (stereo
mini jack)

CD Walkman,
MD Walkman,
WALKMAN*,
VCR, etc.

B To connect to LINE OUT or REC OUT

jacks

Transmitter

C To connect to a headphone jack of a TV

or VCR.
Set the NOISE FILTER switch to ON if
noise is heard.

to AUDIO IN
B jack

OFF ON

FILTERNOISE

Left channel
(white)

RBAL

AUDIO IN

Connecting cord
(supplied)

Right channel
(red)

to LINE OUT or REC
OUT jacks

Stereo system, VCR,
etc.

DC IN 9V

123

CHANNEL

Transmitter

to AUDIO IN
A jacks

OFF ON

FILTERNOISE

Right channel
(red)

Connecting cord
(supplied)

RBAL

AUDIO IN

DC IN 9V

123

CHANNEL

Left channel
(white)

to stereo mini jack

TV, etc.

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.

• When the transmitter is placed on or near a TV, it
may pick up noise.
In such case, place the transmitter away from the
TV.

continue to next page

5

Continued

2 Connect 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 transmitter directly to a
monaural 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.

Charging the headphone battery

Using the headphones for the first time

When you use the headphones for the first time,
charge the battery in the following manner.

1 Connect the transmitter to a power

source.

Transmitter

to an AC outlet

To DC IN
9 V jack

AC power adaptor
(supplied)

Place the headphones on the transmitter such
that the charging pins on the transmitter engage
the charging contacts on the bottom of the
housing.
The charge indicator on the transmitter will light
in green to indicate that the battery is being
charged.
Once 24 hours have elapsed since the start of
battery charging, the charger automatically shuts
off, and the green indicator goes out.

6

To recharge the headphone battery after
use

Since the charger shuts itself off in response to its
internal timer after 24 hours, there is no need to
worry about overcharing.

N Operating the system

Listening to a program

Charging and using hours
Approx. charging

hours

1

24**

* at 1 kHz, 1 mW + 1 mW output
** The hours required to fully charge empty batteries

Approx. using time*

60 minutes

25 hours

1 First turn on the audio/video

equipment and start playing.

2 Remove the headphones from the

transmitter.
The transmitter’s power indicator will
light in red.

3 Select the radio frequency with the

CHANNEL selector switch.

123

CHANNEL

continue to next page

7

Continued

4 When you put on the headphones the

headphone power turns on
automatically.

5 Turn up the volume to a moderate

level with the VOL control.
Press the TUNING button briefly for
automatic tuning of the headphones.
If you do not receive a clear audio
signal, press it again.

Sending RF signals from the Transmitter

The transmitter starts sending the RF signals
automatically, when it detects audio signals from
the equipment connected.
If it does not detect an audio signal for more than
approximately four minutes, the transmitter will
stop sending RF signals, and the power indicator
turns off.
When the transmitter receives an audio signal
again, it starts sending the RF signals, and the
power indicator will light in red again.
If the audio signal is very weak, the transmitter
does not send RF signals. If the transmitter is
connected to a headphone jack, make sure the
volume of the equipment connected is set to 5 – 6
or higher.
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.

Auto power on/off function

When you remove the headphones from your
head, the power turns off automatically. Do not
allow the self adjusting band to be pulled up,
otherwise the headphones will be switched on.

TUNING
button

VOL control

Try the above steps 3 and 5 until the
receiving performance becomes better.

8

The power turns on.

Note

If a hissing noise is heard move closer to the transmitter.

The effective areas of

Replacing the ear pads

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 noise, 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.

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 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.

9

N Additional information

Precautions

• 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.

• 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.

Disposing of the headphones

Be sure to remove the built-in rechargeable
batteries from the headphones before you
dispose of the headphones.
First remove the left headphone’s ear pad.
You will see four screws. Remove the four
screws and open the housing.

Troubleshooting

Problem

No sound/
Muffled
sound

Solution

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 a
headphone jack.

Change the radio frequency with the
CHANNEL selector on the
transmitter, then press the TUNING
button again.

The mute function is activated.
Use the headphones near the
transmitter.

The headphones’ POWER indicator
light is weak or turned off.

•Charge the built-in rechargeable
battery or if the POWER indicator is
still off after charging the built­in rechargeable battery, take the
headphones to a Sony dealer for
replacement of the rechargeable
battery.

If you connect the transmitter to the
LINE OUT or REC OUT jack of an
audio reproducer, make sure that the
NOISE FILTER switch is set to OFF.

Make sure that the NOISE FILTER
switch is set to either ON or OFF (If
the switch gets stuck between ON and
OFF, the sound will be cut off).

10

Problem

Distortion

Loud
background
noise

Solution

If the transmitter is
connected to a headphone jack, turn
down the volume of the connected
audio/video equipment.

Change the radio frequency with the
CHANNEL selector on the
transmitter.

The headphones’ POWER indicator
light is weak or turned off.

•Charge the built-in rechargeable
battery or if the POWER indicator is
still off after charging the built-in
rechargeable battery, take the
headphones to a Sony dealer for
replacement of the rechargeable
battery.

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 a
headphone jack, turn up the volume
of the connected audio/video
equipment.

Change the radio frequency with the
CHANNEL selector on the
transmitter, then press the TUNING
button again.

The headphones’ POWER indicator
light is weak or turned off.

•Charge the built-in rechargeable
battery or if the POWER indicator is
still off after charging the built-in
rechargeable battery, take the
headphones to a Sony dealer for
replacement of the rechargeable
battery.

If you connect the transmitter to the
LINE OUT or REC OUT jack of an
audio reproducer, make sure that the
NOISE FILTER switch is set to OFF.

Specifications

General

Carrier frequency

863.5 – 864.5 MHz
Channel Ch1, Ch2, Ch3
Modulation FM stereo
Frequency response

18 – 22,000 Hz

Transmitter TMR-RF875R

Power source DC 9 V: supplied AC power

adaptor

Audio input phono jacks/stereo mini jack
Dimensions Approx. 130 × 135 × 150 mm

(5 1/4 × 5 3/8 × 6 in.) (w/h/d)

Mass Approx. 200 g (7 oz.)

Headphones MDR-RF875R

Power source DC 2.4 V: Built-in rechargeable

battery

Mass Approx. 350 g (12.3 oz.) incl.

built-in rechargeable battery

Built-in Ni-MH rechargeable battery

Model name NH-AAC
Voltage 1.2 V
Capacity 1,000 mAh

Optional accessory

Plug adaptor PC-236HG (stereo mini jack y

monaural mini plug)

Design and specifications are subject to change without
notice.

11

Svenska

Härmed intygar Sony Corp. att detta högtalarsystem står i
överensstämmelse med de väsentliga egenskapskrav och övriga
relevanta bestämmelser som framgår av direktiv 1999/5/EG.
Mer information finns på webbadressen:
http://www.compliance.sony.de/

Den här produkten är avsedd att användas i följande länder.
Version CEK: Storbritannien
Version CED: Tyskland, Sverige, Danmark, Finland, Norge,

Produktens version framgår av streckkodsetiketten på lådans
översida.

Dansk

Undertegnede, Sony Corp., erklærer herved, at følgende udstyr
overholder de væsentlige krav og øvrige relevante krav i direktiv
1999/5/EF.
Yderligere oplysninger findes på
http://www.compliance.sony.de/

Dette produkt er beregnet til brug i følgende lande.
CEK-version: Storbritannien
CED-version: Tyskland, Sverige, Danmark, Finland, Norge,

Øverst på kassen findes en stregkode, hvor du kan se, hvilken
version kassen indeholder.

Suomi

Sony Corp. vakuuttaa täten, että tämä laite on direktiivin 1999/5/
EY oleellisten vaatimusten ja sitä koskevien direktiivin muiden
ehtojen mukainen.
Lisätietoja on seuraavassa Web-sivustossa:
http://www.compliance.sony.de/

Tämä tuote on tarkoitettu käytettäväksi seuraavassa maissa.
CEK-malli: Iso-Britannia
CED-malli: Saksa, Ruotsi, Tanska, Suomi, Norja, Belgia,

Näet version pakkauksen yläosassa olevasta viivakooditarrasta.

Norsk

Herved erklærer Sony Corp.at dette utstyret er i
overensstemmelse med vesentlige krav og andre relevante
bestemmelser som fremgår av direktiv 1999/5/EC.
Gå til denne URL-en for mer informasjon:
http://www.compliance.sony.de/

Dette produktet er ment for bruk i følgende land:
CEK-versjon: Storbritannia
CED-versjon: Tyskland, Sverige, Danmark, Finland, Norge,

Du kan sjekke versjon ved å se på strekkode-etiketten på toppen
av esken.

Ελληνικά

ΜΕ ΤΗΝ ΠΑΡΟΥΣΑ Η Sony Corp. ∆ΗΛΩΝΕΙ ΟΤΙ H ΣΥΣΚΕΥΗ
ΣΥΜΜΟΡΦΩΝΕΤΑΙ ΠΡΟΣ ΤΙΣ ΟΥΣΙΩ∆ΕΙΣ ΑΠΑΙΤΗΣΕΙΣ ΚΑΙ ΤΙΣ
ΛΟΙΠΕΣ ΣΧΕΤΙΚΕΣ ∆ΙΑΤΑΞΕΙΣ ΤΗΣ Ο∆ΗΓΙΑΣ 1999/5/ΕΚ.
Για περισστερες λεπτοµέρειες, παρακαλούµε να
επισκεφθείτε την παρακάτω ηλεκτρονική διεύθυνση (URL):
http://www.compliance.sony.de/

Αυτ το προϊν προορίζεται για να χρησιµοποιηθεί στις
παρακάτω χώρες.
Εκδοση CEK: Ηνωµένο Βασίλειο
Εκδοση CED: Γερµανία, Σουηδία, ∆ανία, Φιλανδία,

Για να ελέγξετε την έκδοση, παρακαλούµε ανατρέξτε στην
ετικέτα µε τον κωδικ ραβδώσεων που βρίσκεται στο επάνω
µέρος του κουτιού.

Belgien, Schweiz, Österrike, Nederländerna,
Frankrike

Belgien, Schweiz, Østrig, Holland, Frankrig.

Sveitsi, Itävalta, Alankomaat, Ranska

Belgia, Sveits, Østerrike, Nederland, Frankrike

Nορβηγία, Bέλγιο, Ελβετία, Aυστρία,
Ολλανδία, Γαλλία

Printed in Korea

Français

Par la présente, Sony Corp. déclare que cet appareil est conforme
aux exigences essentielles et aux autres dispositions pertinentes
de la directive 1999/5/CE.
Pour de plus amples informations, veuillez vous reporter à l’URL
suivante : http://www.compliance.sony.de/

Ce produit est conçu pour être utilisé dans les pays suivants.
Versions CEK : Royaume-Uni
Version CED : Allemagne, Suède, Danemark, Finlande, Norvège,

Pour connaître la version que vous utilisez, veuillez vous reportez
au code barre situé sur la partie supérieure de la boîte.

Deutsch

Hiermit erklärt die Sony Corporation, dass sich dieses Gerät in
Übereinstimmung mit den grundlegenden Anforderungen und den
anderen relevanten Vorschriften der Richtlinie 1999/5/EG befindet.
Erläuterungen dazu finden Sie unter folgendem URL:
http://www.compliance.sony.de/

Dieses Gerät kann in folgenden Ländern verwendet werden.
Version CEK: Großbritannien
Version CED: Deutschland, Schweden, Dänemark, Finnland,

Wenn Sie nachsehen wollen, um welche Version es sich bei Ihrem
Modell handelt, schauen Sie bitte nach dem Strichcodeetikett
oben auf dem Karton.

Español

Por medio de la presente, Sony Corp. declara que el equipo
cumple con los requisitos esenciales y cualesquiera otras
disposiciones aplicables o exigibles de la Directiva 1999/5/CE.
Para obtener más información, visite la dirección URL siguiente:
http://www.compliance.sony.de/

Este producto está destinado a utilizarse en los siguientes países:
Versión CEK: Reino Unido
Versión CED: Alemania, Suecia, Dinamarca, Finlandia, Noruega,

Para comprobar la versión, consulte la etiqueta del código de
barras situada en la parte superior de la caja.

Nederlands

Hierbij verklaart Sony Corp. dat dit toestel in overeenstemming is
met de essentiële eisen en de andere relevante bepalingen van
richtlijn 1999/5/EG.
Ga naar de volgende URL voor meer informatie:
http://www.compliance.sony.de/

Dit product is bestemd voor gebruik in de volgende landen:
CEK versie: Verenigd Koninkrijk
CED versie: Duitsland, Zweden, Denemarken, Finland,

De versie vindt u op het barcode label boven op de doos.

Italiano

Con la presente Sony Corp. dichiara che questo apparecchio è
conforme ai requisiti essenziali ed alle altre disposizioni
pertinenti stabilite dalla direttiva 1999/5/CE.
Per ulteriori informazioni, accedere al seguente indirizzo URL:
http://www.compliance.sony.de/

Il presente prodotto è destinato all'utilizzo nei paesi elencati di
seguito.
Versione CEK: Regno Unito
Versione CED: Germania, Svezia, Danimarca, Finlandia, Norvegia,

Per verificare la versione, fare riferimento all'etichetta con il
codice a barre situata sulla parte superiore della scatola.

Português

A Sony Corp., declara que este equipamento está conforme com os
requisitos essenciais e outras provisões da directiva 1999/5/CE.
Para saber mais pormenores, aceda ao seguinte URL :
http://www.compliance.sony.de/

Este produto destina-se a ser utilizado nos seguintes países:
Versão CEK: Reino Unido
Versão CED: Alemanha, Suécia, Dinamarca, Finlândia, Noruega,

Para verificar a versão, consulte a etiqueta do código de barras
localizada na parte de cima da caixa.

Belgique, Suisse, Autriche, Pays-Bas, France

Norwegen, Belgien, Schweiz, Österreich,
Niederlande, Frankreich

Bélgica, Suiza, Austria, Holanda, Francia

Noorwegen, België, Zwitserland, Oostenrijk,
Nederland, Frankrijk

Belgio, Svizzera, Austria, Olanda, Francia

Bélgica, Suíça, Áustria, Países Baixos, França