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Operating Instructions
Mode d'emploi
Manual de instrucciones
Wireless Stereo
Headphone System
© 2004 Sony Corporation

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Nickel Metal Hydride
batteries are recyclable.
You can help preserve
our environment by
returning your used
rechargeable batteries
to the collection and
recycling location nearest you.
For more information regarding recycling of
rechargeable batteries, call toll free
1-800-822-8837, or
Do not handle damaged or leaking Nickel
Metal Hydride batteries.
To prevent fire or shock hazard, do
not expose the unit to rain or
To avoid electrical shock, do not
open the cabinet. Refer servicing to
qualified personnel only.
You are cautioned that any changes or
modifications not expressly approved in this
manual could void your authority to operate this
If you have any questions about this product,
you may call:
Sony Customer Information Services Center
1-800-222-7669 or
Declaration of Conformity
Trade Name:
Model No.:
(Headphones Unit)
Responsible Party: Sony Electronics Inc.
680 Kinderkamack
Road, Oradell, NJ
07649 USA
Telephone No.:
This device complies with Part 15 of the FCC
Rules. Operation is subject to the following
two conditions: (1) This device may not cause
harmful interference, and (2) this device must
accept any interference received, including
interference that may cause undesired
For the customers in the Canada
Operation is subject to the following two
conditions: (1) this device may not cause
interference, and (2) this device must accept any
interference, including interference that may
cause undesired operation of the device.
For the customers in the USA and
Note :
This equipment has been tested and found to
comply with the limits for a Class B digital
device, pursuant to Part 15 of the FCC Rules.
These limits are designed to provide reasonable
protection against harmful interference in a
residential installation. This equipment
generates, uses and can radiate radio frequency
energy and, if not installed and used in
accordance with the instructions, may cause
harmful interference to radio communications.
However, there is no guarantee that interference
will not occur in a particular installation. If this
equipment does cause harmful interference to
radio or television reception, which can be
determined by turning the equipment off and on,
the user is encouraged to try to correct the
interference by one or more of the following
­ Reorient or relocate the receiving antenna.
­ Increase the separation between the
equipment and receiver.
­ Connect the equipment into an outlet on a
circuit different from that to which the
receiver is connected.
­ Consult the dealer or an experienced radio/
TV technician for help.

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Thank you for purchasing the Sony
MDR-RF920RK/RF960RK 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 batteries. Just by placing the
headphones on the transmitter, headphone
batteries can be charged.
· Comfortable Circum-aural headphones with
self adjusting head band
· Automatic ON/OFF function on headphones
to preserve battery power
· As a power saving feature, the transmitter
automatically turns ON when the audio signal
is detected and OFF when the signal is not
Notes on receiving
The system for this equipment utilizes very high
frequency signals in the 900 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
· 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 supplied rechargeable
batteries ............................................... 4
Setting up the transmitter ........................ 7
Operating the system
Listening to a program ............................. 9
The effective areas of the transmitter .. 11
Replacing the ear pads ........................... 11
Additional information
Precautions .............................................. 12
Troubleshooting ...................................... 12
Specifications ........................................... 13

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Getting started
Check that you have the following items:
· The headphones (1)
· The transmitter (1)
· AC power adaptor (1)
· Unimatch plug adaptor (1)
(stereo mini jack
y stereo phone plug)
· Connecting cord (1)
(phono plugs
y stereo mini plug), 1 m (3.3 ft.)
· Rechargeable nickel-metal hydride batteries (2)
Charging the supplied
rechargeable batteries
The supplied rechargeable nickel-metal hydride
batteries are not charged from the first time you
use them. Be sure to charge them before use.
To charge the headphones, place them on the
1 Press the button of the left housing
to open the battery compartment
The battery compartment lid comes off.
2 Insert the supplied rechargeable
nickel-metal hydride batteries into
the battery compartment matching
the 3 terminals on the batteries to
the 3 marks in the compartment.
Do not use rechargeable batteries other
than the supplied ones.

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continue to next page
3 Close the battery compartment lid.
4 Connect the supplied AC power
adaptor to the transmitter.
5 Rest the headphones on the
transmitter so that the
headphones' contact point meets
the transmitter's contact pin while
making sure that the charging
indicator lights in green.
Charging is completed in about 16
hours and the charging indicator goes
When placing the headphones on the
transmitter, be sure to hold them level
with both hands and that the right and
left housings are placed straight down
on the transmitter, and then tilt them
back as illustrated above.
AC power
to DC IN 9V jack
to an AC outlet
When the indicator does not light in
Check if the right and left headphones are rested
on the transmitter correctly. The indicator will
not light up if the headphones' contact point does
not meet the transmitter's contact pin. Remove
the headphones and replace them on the
transmitter again so that the indicator lights in
To recharge the headphone battery
after use
Place the headphones on the transmitter after
use. Since the built-in timer recognizes when
charging is complete, there is no need to remove
the headphones from the transmitter after
· The transmitter automatically turns off while charging
the batteries.
· This system is designed to charge only the supplied
rechargeable batteries type BP-HP550 for safety. Note
that other types of rechargeable batteries cannot be
charged with this system.
· If dry batteries are installed, they cannot be charged.
· Do not attempt to use the supplied BP-HP550
rechargeable batteries for other components. They are
for use with this system only.
· Charge in an environmental temperature of between
0°C and 40°C (between 32°F and 104°F).
Left housing