Sony MDR-RF912RK Operating Instructions

Wireless Stereo

Headphone System

Operating Instructions
©2017 Sony Corporation Printed in China
MDR-RF912RK
English Wireless Stereo Headphone System
Note
WARNING
This equipment has been tested and found to comply with
To reduce the risk of fire or electric shock, do not the limits for a Class B digital device, pursuant to Part 15 of
expose this apparatus to rain or moisture. the FCC Rules. These limits are designed to provide
reasonable protection against harmful interference in a
To reduce the risk of fire or electric shock, do not expose
residential installation. This equipment generates, uses
this apparatus to dripping or splashing, and do not place
and can radiate radio frequency energy and, if not
objects filled with liquids, such as vases, on the apparatus.
installed and used in accordance with the instructions,
may cause harmful interference to radio communications.
Do not expose the batteries (battery pack or batteries
However, there is no guarantee that interference will not
installed) to excessive heat such as sunshine, fire or the
occur in a particular installation. If this equipment does
like for a long time.
cause harmful interference to radio or television reception,
To avoid electrical shock, do not open the cabinet. Refer which can be determined by turning the equipment off
servicing to qualified personnel only. and on, the user is encouraged to try to correct the
interference by one or more of the following measures:
Do not install the appliance in a confined space, such as a
– Reorient or relocate the receiving antenna.
bookcase or built-in cabinet.
– Increase the separation between the equipment and
receiver.
The AC Adaptor is not disconnected from the mains as
– Connect the equipment into an outlet on a circuit
long as it is connected to the AC outlet, even if the unit
different from that to which the receiver is connected.
itself has been turned off.
– Consult the dealer or an experienced radio/ TV
As the main plug of AC power adaptor is used to
technician for help.
disconnect the AC power adaptor from the mains, connect
For the customers in Canada
it to an easily accessible AC outlet. Should you notice an
abnormality in it, disconnect it from the AC outlet
This device complies with Industry Canada's licence-
immediately.
exempt RSSs. Operation is subject to the following two
conditions:
Excessive sound pressure from earphones and
(1)This device may not cause interference; and
headphones can cause hearing loss.
(2)This device must accept any interference, including
interference that may cause undesired operation of the
The nameplate of transmitter is located on the bottom
exterior. device.
For the customers in the USA and
Information
Canada
You are cautioned that any changes or modifications not
expressly approved in this manual could void your
RECYCLING NICKEL METAL
authority to operate this equipment.
HYDRIDE BATTERIES
If you have any questions about this product, you may
call:
Nickel Metal Hydride batteries are
Sony Customer Information Services Center
recyclable. You can help preserve our
1-800-222-7669 or http://www.sony.com/
environment by returning your used
rechargeable batteries to the collection
Declaration of Conformity
and recycling location nearest you.
Trade Name: SONY
Model No.: MDR-RF912R For more information regarding recycling of
(Headphones Unit)
rechargeable batteries, call toll free 1-800-822-8837, or
Responsible Party: Sony Electronics Inc.
visit http://www.call2recycle.org
Address: 16535 Via Esprillo, San Diego, CA
Caution:
92127 USA
Do not handle damaged or leaking Nickel Metal
Telephone No.: 858-942-2230
Hydride batteries.
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
operation.
Checking the included items
4-725-918-11(1)
RF stereo transmitter Wireless stereo headphones AC adaptor (1)
TMR-RF912R MDR-RF912R
How to use
1
Insert the supplied rechargeable battery into the left housing of
the headphones.
Observe the correct polarity when installing battery.
Press and turn the lid counterclockwise. Match the  terminals on
the battery to the  marks
in the comportment.
2 3
Connect the AC Charge the headphones.
adaptor.
Insert the plug firmly.
To AC outlet
4
Connect the A/V component, following hookup  or  below.
 Using the headphone jack of the A/V component
Set the volume of the A/V component as high as possible, but not so high that the
audio signal becomes distorted.
 Using the audio out (L/R) jacks of the A/V component
Use a plug adaptor (not supplied) between the transmitter and the A/V component.
L (white)
R (red)
Plug adaptor (Stereo mini jack ×1
 Pin plug ×2, not supplied)
If the sound is distorted by connecting the transmitter
to the A/V component's audio out (L/R) jacks,
reconnect the transmitter to the headphone jack.
If you want to receive audio on the headphones while at the same time hearing audio
from the television speakers:
connect the transmitter to your Cable Box/Satellite Box rather than your television.
5 6
Wear the headphones.
Before listening
To reduce the risk of hearing damage, first
lower the volume.
Tactile dot
7
Adjust the volume.
Rechargeable nickel-metal
hydride battery BP-HP550-11 (1)
Tactile dot
After use
Take off the headphones, then turn off the power.
About sending RF signals
The transmitter starts sending RF signals automatically
when it detects an audio signal from the connected
component.
Notes
ˋ If hiss is heard, move closer to the transmitter. ˋ
Press and turn the lid clockwise.
ˋ You may hear some noise when you disconnect the ˋ
AC adaptor from the transmitter before turn off the
headphones.
If no signal or low signal is input
for about 4 minutes
If the transmitter does not detect an audio signal for
about 4 minutes, it will stop sending RF signals
automatically*, and the POWER indicator will blink for
(Red) (Off) 1 minute, then turn off. The transmitter restarts after
Complete when indicator receiving an audio signal again.
turns off. The transmitter may also turn off if low signal is input
for about 4 minutes. In this case, raise the volume of
the connected A/V component within the range where
the sound is not distorted, then lower the volume of
the headphones.
* If signal noise is output from the connected A/V
component, the transmitter may not turn off, even
when no audio signal is input.
Set the ATT (attenuator) switch to 0dB. Then, raise the
volume of the connected A/V component within the
range where the sound is not distorted, and lower the
volume of the headphones.
Tips for charging
Charge the headphones first
The supplied rechargeable nickel-metal hydride battery is
not charged from the first time you use them. Charge
TV, Digital music player, etc. them before use.
Headphone
jack (Stereo
If the transmitter's POWER indicator
mini jack)
does not light up red
Check if the switch on the left housing of the headphones
is set to OFF. If the switch is set to ON, the POWER
indicator does not light up.
You cannot charge any rechargeable battery or dry battery
other than the supplied battery.
Charging and usage time
Approx. charging time Approx. usage time
Stereo system, Blu-ray Disc
1 hour 90 minutes
player, DVD player, TV*, etc.
7 hours 13 hours
2) 3)
* In case of no headphone
1) at 1 kHz, 1 mW + 1 mW output
jack.
Audio out
2) hours required to fully charge an empty battery
(L/R) jacks
3) Time may vary, depending on the temperature or
conditions of use.
To recharge supplied battery after
use
Connect the headphones to the CHARGE plug of the
transmitter after use. The POWER indicator lights up red,
then charging starts.
When charging is complete, there is no need to remove
the headphones from the transmitter.
Remaining battery
To check the remaining battery charge of the headphones,
turn on the switch located on the left housing of the
headphone, and check the POWER indicator located on
the left housing. The battery is still serviceable when the
indicator lights up red.
Turn on the A/V component.
Charge the headphones if the POWER indicator light dims,
flashes, or the sound becomes distorted or noisy.
Notes
ˋ Do not connect the CHARGE plug to anything other ˋ
than these headphones.
ˋ The transmitter automatically stops sending RF signals ˋ
while charging the battery.
ˋ This system is designed to charge only the supplied ˋ
rechargeable battery type BP-HP550-11 for safety. Note
that other types of rechargeable battery cannot be
charged with this system.
ˋ If dry batteries are installed, they cannot be charged. ˋ
ˋ Do not attempt to use the supplied BP-HP550-11 ˋ
rechargeable battery for other components. They are
for use with this system only.
ˋ Charge in an environmental temperature of between ˋ
0 °C and 40 °C (between 32 °F and 104 °F).
If you cannot receive a clear audio signal Replacing the earpads
First change the radio frequency with the CHANNEL selector switch
The earpads are replaceable. If the earpads become dirty
on the transmitter, then change the radio frequency to that of the
or worn out, replace them as illustrated below. The
transmitter with the channel switch on the headphones.
earpads are not commercially available. You can order
replacements from the store where you purchased this
system, or at your nearest Sony dealer.
1
Remove the old earpad by pulling it out of the groove
on the housing.
2
Place the new earpad on the driver unit.
Hang the edge of the earpad on one side of the driver
unit's groove edge, then turn the edge of earpad
Tips for volume setting
around the driver unit as illustrated below.
When the earpad is securely inserted into the groove,
When watching videos, be careful not to raise the volume
adjust the earpad to the vertical position.
too high in quiet scenes. You may hurt your ears when a
loud scene is played.
To set the input level
If the volume is high using the analogue input, set the ATT
(attenuator) switch to "–6 dB."
Troubleshooting
If you run into any problems using this system, use the
following checklist. Should any problem persist, consult
your nearest Sony dealer.
No sound/Low sound
Setting Connected components
ˋ Turn on the headphones. ˋ
0 dB TV, portable components and other
ˋ Check the connection of the transmitter and A/V ˋ
components with a low output level (initial
component, AC adaptor, and AC outlet.
settings)
ˋ Check that the A/V component is turned on. ˋ
-6 dB Other components ˋ If you connect the transmitter to the headphone jack of ˋ
an A/V component, raise the volume level on the
Notes
connected A/V component within the range where the
ˋ Be sure to lower the volume before setting the ATT ˋ sound is not distorted.
switch. ˋ Change the radio frequency with the CHANNEL selector ˋ
ˋ If audio input is distorted (sometimes, noise can be ˋ on the transmitter, then change the radio frequency to
that of the transmitter with the channel switch on the
heard at the same time), set the ATT switch to "–6 dB."
headphones.
ˋ Charge the supplied rechargeable battery, or replace ˋ
dry batteries with new ones. If the POWER indicator is
Using the headphones
still off after charging, take the headphones to a Sony
dealer.
with separately-sold dry
The sound cuts off
batteries
ˋ The transmitter turns off if no signal or low signal is ˋ
input for 4 minutes. If you connect the transmitter to an
Commercially available (LR03 (size AAA)) dry batteries can A/V component using the headphone jack, raise the
also be used to power the headphones. Install two volume level on the connected A/V component within
batteries in the same manner as described in step 1 of the range where the sound is not distorted.
"How to use."
Distorted or intermittent sound
When dry batteries are installed, the battery charge
function is not activated. (sometimes with noise)
Battery life ˋ Use the headphones near the transmitter, or change ˋ
the position of the transmitter.
ˋ If you connect the transmitter to an A/V component ˋ
Battery Approx. usage time
1)
using the headphone jack, lower the volume level on
Sony alkaline battery LR03 28 hours
2)
the connected A/V component within the range where
(size AAA)
the sound is not distorted.
ˋ Change the radio frequency with the CHANNEL selector ˋ
1) at 1 kHz, 1 mW + 1 mW output
on the transmitter, then change the radio frequency to
1) 2) Time may vary, depending on the temperature or
that of the transmitter with the channel switch on the
conditions of use.
3) headphones.
ˋ Charge the supplied rechargeable battery, or replace ˋ
dry batteries with new ones. If the POWER indicator is
still off after charging, take the headphones to a Sony
Tips for better reception
dealer.
Loud background noise
Receiving performance
ˋ If you connect the transmitter to the headphone jack of ˋ
This system utilizes very high frequency signals in the 900
an A/V component, raise the volume level on the
MHz band so the receiving performance may deteriorate
connected A/V component within the range where the
due to the surroundings. The following examples illustrate
sound is not distorted.
conditions that may reduce the reception range or cause
ˋ Charge the supplied rechargeable battery, or replace ˋ
interference.
dry batteries with new ones. If the POWER indicator is
ˋ Inside a building with walls containing steel beams. ˋ
still off after charging, take the headphones to a Sony
ˋ An area with many steel file cabinets, etc. ˋ
dealer.
ˋ An area with many electrical appliances capable of ˋ
ˋ Use the headphones near the transmitter. ˋ
generating electromagnetic fields.
ˋ The transmitter is placed on a metal instrument. ˋ
Battery cannot be charged/
ˋ An area facing a roadway. ˋ
POWER indicator does not light up
ˋ Noise or interfering signals exist in the surroundings ˋ
due to radio transceivers in trucks, etc.
red
ˋ Noise or interfering signals exist in the surroundings ˋ
ˋ Install the supplied rechargeable nickel-metal hydride ˋ
owing to wireless communication systems installed
battery. Dry batteries and rechargeable batteries other
along roadways.
than the supplied cannot be charged.
Effective area of the transmitter ˋ Check if the switch on the left housing of the ˋ
headphones is set to OFF. If the switch is set to ON, the
The optimum distance is up to approximately 45 m (150 ft)
POWER indicator does not light up.
without the system picking up some interference.
However, the distance may vary depending on the
Short usage time (the supplied
surroundings and environment.
rechargeable battery)
ˋ If the system picks up some noise within the above ˋ
mentioned distance, reduce the distance between the
ˋ Clean the + and - terminal of the supplied rechargeable ˋ
transmitter and the headphones, or select another
battery and the charging terminal of transmitter/
channel.
headphone with a dry cloth.
ˋ When you use the headphones inside the effective area ˋ
ˋ Recharge the supplied rechargeable battery after the ˋ
of the transmitter, the transmitter can be placed in any
fully discharged.
direction from the listener.
ˋ If the usage time is still short, consult your nearest Sony ˋ
ˋ Even within the signal reception area, there are some ˋ
dealer.
spots (dead spots) where the RF signal cannot be
received. This characteristic is inherent to RF signals,
and does not indicate malfunction. By slightly moving
the transmitter, location of the dead spot can be
changed.
Precautions
Notes on the AC adaptor
ˋ Insert the AC adaptor plug firmly. ˋ
ˋ Be sure to use the supplied AC adaptor. Using AC ˋ
adaptors with different plug polarity or other
characteristics can cause product failure.
Unified
polarity plug
ˋ Be sure to always use the supplied AC adaptor. Even AC ˋ
adaptors having the same voltage and plug polarity can
damage this product due to the current capacity or
other factors.
On power sources and placement
ˋ When this system is not to be used for a long period of ˋ
time, disconnect the AC adaptor from the AC outlet
holding the plug, and remove the battery from the
headphones to avoid damage caused by battery
leakage and subsequent corrosion.
ˋ Do not leave this system in a location subject to direct ˋ
sunlight, heat or moisture.
ˋ Avoid exposure to temperature extremes, direct ˋ
sunlight, moisture, sand, dust or mechanical shock.
ˋ Please note that water does not splash, this product is ˋ
not waterproof specification.
Specifications
General
Carrier frequency
915.5 MHz, 916.5 MHz
Channel Ch1, Ch2
Modulation FM stereo
Transmission distance
Approx. 45m (150 ft) of longest.
Operating temperature
0°C to 40°C (32 °F to 104 °F)
Frequency response
20 Hz – 20,000 Hz
RF stereo transmitter (TMR-RF912R)
Power source DC 12 V: supplied AC adaptor
Audio input Stereo mini plug
Dimensions Approx. 108 mm × 128 mm × 108 mm
(4 3/8 × 5 1/8 × 4 3/8 in) (w/h/d)
Mass Approx. 137 g (4.83 oz)
Rated power consumption
3 W
Wireless stereo headphones
(MDR-RF912R)
Power source Supplied rechargeable nickel-metal
hydride battery BP-HP550-11 or
commercially available (size AAA)
dry-cell batteries
Mass Approx. 270 g (9.52 oz) (including the
supplied rechargeable nickel-metal
hydride battery)
Rated power consumption
2 W
Included items
RF stereo transmitter TMR-RF912R
Wireless stereo headphones MDR-RF912R
AC adaptor (12 V) (1)
Rechargeable nickel-metal hydride battery BP-HP550-11 (1)
Card warranty (1)
Operating Instructions (this manual) (1)
Design and specifications are subject to change without
notice.