3-864-094-11(1)
Wireless Stereo
Headphone System
Operating Instructions
MDR-RF830RK
Sony Corporation © 1998 Printed in Korea
WARNING
Notes on receiving
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.
Welcome!
Thank you for purchasing the Sony
MDR-RF830RK 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 Supra-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.
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 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 ......................................................3
Charging the headphones’ batteries........... 3
Setting up the headphones ..........................5
Setting up the transmitter ............................ 6
Operating the system
Listening to a program .................................8
The effective areas of the
transmitter ............................................... 9
Replacing the ear pads ............................... 10
Additional information
Precautions ................................................... 10
Troubleshooting ..........................................11
Specifications ................................ back cover
2
( Getting started
Charging the
Unpacking
Check that you have the following items:
• The transmitter
• Ni-Cd rechargeable batteries NC-AA-HJ
• AC power adaptor
• The headphones
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.
1 Press the OPEN button to open the
battery compartment lid of the
transmitter.
2 Insert two NC-AA-HJ batteries
supplied by matching the ] and } on
the batteries to the ] and } in the
battery compartment.
• Unimatch plug adaptor (stereo mini jack ˜
stereo phone plug)
• Connecting cord (phono plugs ˜ stereo mini
plug), 1 m
3 Close the battery compartment.
continue to next page
3
Continued
4 Connect the transmitter to a power
source.
Transmitter
to an AC outlet
To DC IN
9 V jack
AC power adaptor
(supplied)
5 Press the OFF/CHG•POWER ON
switch so that the OFF/CHG indicator
lights up green.
Charging starts.
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
Approx. charging
hours
1
24**
* at 1 kHz, 1 mW + 1 mW output
** The hours required to fully charge empty batteries
Approx. using time*
50 minutes
20 hours
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.
4
Setting up the
headphones
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.”
1 Open the battery compartment lid on
the left outer side of the head band.
2 Insert two charged NC-AA-HJ batteries
by matching the ] and } on the
batteries to the ] and } in the battery
compartment.
Battery life
Battery
Sony alkaline battery
LR6 (SG)
Sony battery R6P (SR)
* 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.
Approx. hours*
60
30
3 Close the battery compartment lid.
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.
5
Setting up the
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 headphones jack
Transmitter
b To connect to LINE OUT or REC OUT
jacks
Transmitter
to AUDIO IN
B jack
Right channel
(red)
Connecting cord
(supplied)
Unimatch plug
adaptor
(supplied)
to headphones
jack (stereo
phone jack)
to AUDIO IN
A jacks
Left channel
(white)
to headphones
jack (stereo
mini jack)
Discman, MD,
WALKMAN*, VCR,
etc.
Left channel
(white)
Connecting cord
(supplied)
Right channel
(red)
to LINE OUT or REC
OUT jacks
Stereo system, VCR,
etc.
6
c To connect to TV etc.
If noise occurs when the transmitter is
connected to your TV or VCR, set the
NOISE FILTER switch to ON.
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.
Transmitter
Right channel
(red)
Connecting cord
(supplied)
to stereo mini jack
Note
•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 a and b on page 6, 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.
to AUDIO IN
A jack
Left channel
(white)
TV, etc.
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.
7
( Operating the system
Listening to a program
1 First turn on the audio/video
equipment, then turn on the
transmitter.
2 Select the radio frequency with the
CHANNEL selector switch.
3 Put on the headphones and the power
turns on automatically.
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.
4 Turn 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.
TUNING
2
control
VOL control
1
Try the above steps 2 and 4 until the
receiving performance becomes better.
8
The power turns on. The power turns off.
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.
Holder
Self adjusting
band
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.
9
Replacing the ear pads
( Additional information
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.
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.
Make sure that the entire edge of the ear pad is
securely inserted into the groove.
10
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.
Troubleshooting
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 the
headphones 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.
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.
continue to next page
11
Continued
Problem
The batteries
cannot be
charged.
Incapable
of the tuning
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.
Specifications
General
Carrier frequency
863.32 – 863.67 MHz
Channel Ch1, Ch2
Modulation FM stereo
Frequency response
20 – 20,000 Hz
Transmitter TMR-RF830R
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 1/2 in.) (w/h)
Mass Approx. 155 g (5.5 oz.)
Headphones MDR-RF830
Power source DC 3 V: 2 × R6 (size AA) battery
or 2 × supplied
NC-AA-HJ Ni-Cd
rechargeable battery
Mass Approx. 215 g (7.6 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)
Sony Corporation Printed in Korea
Design and specifications are subject to change without
notice.
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