Manual Sony MDR-RF912RK Headphone

Manual

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Wireless Stereo

Headphone System

Operating Instructions

4-725-918-12(1)

MDR-RF912RK

©2017 Sony Corporation Printed in China

How to use

Charge the headphones.

Insert the supplied rechargeable battery into the left housing of

the headphones.

Observe the correct polarity when installing battery.

Connect the A/V component, following hookup  or  below.

 Using the headphone jack of the A/V component

Headphone

jack (Stereo

mini jack)

TV, Digital music player, etc.

Turn on the A/V component.Wear the headphones.

Before listening

To reduce the risk of hearing damage, first

lower the volume.

Tactile dot

Checking the included items

AC adaptor (1)

RF stereo transmitter

TMR-RF912R

Wireless stereo headphones

MDR-RF912R

Rechargeable nickel-metal

hydride battery BP-HP550-11 (1)

Plug adaptor (stereo mini

plug  phono plugs) (1)

Adjust the volume.

Tactile dot

If you cannot receive a clear audio signal

First change the radio frequency with the CHANNEL selector switch

on the transmitter, then change the radio frequency to that of the

transmitter with the channel switch on the headphones.

English Wireless Stereo Headphone System

WARNING

To reduce the risk of fire or electric shock, do not

expose this apparatus to rain or moisture.

To reduce the risk of fire or electric shock, do not expose

this apparatus to dripping or splashing, and do not place

objects filled with liquids, such as vases, on the apparatus.

Do not expose the batteries (battery pack or batteries

installed) to excessive heat such as sunshine, fire or the

like for a long time.

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.

The AC Adaptor is not disconnected from the mains as

long as it is connected to the AC outlet, even if the unit

itself has been turned off.

As the main plug of AC power adaptor is used to

disconnect the AC power adaptor from the mains, connect

it to an easily accessible AC outlet. Should you notice an

abnormality in it, disconnect it from the AC outlet

immediately.

Excessive sound pressure from earphones and

headphones can cause hearing loss.

The nameplate of transmitter is located on the bottom

exterior.

Information

You are cautioned that any changes or modifications not

expressly approved in this manual could void your

authority to operate this equipment.

If you have any questions about this product, you may

call:

Sony Customer Information Services Center

1-800-222-7669 or http://www.sony.com/

Declaration of Conformity

Trade Name: SONY

Model No.: MDR-RF912R

(Headphones Unit)

Responsible Party: Sony Electronics Inc.

Address: 16535 Via Esprillo, San Diego, CA

92127 USA

Telephone No.: 858-942-2230

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.

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 measures:

– 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.

For the customers in Canada

This device complies with Industry Canada’s licence-

exempt RSSs. 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

Canada

RECYCLING NICKEL METAL

HYDRIDE BATTERIES

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

visit http://www.call2recycle.org

Caution:

Do not handle damaged or leaking Nickel Metal

Hydride batteries.

(Red) (Off)

Complete when indicator

turns off.

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

 If hiss is heard, move closer to the transmitter.

 You may hear some noise when you disconnect the

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

1 minute, then turn off. The transmitter restarts after

receiving an audio signal again.

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

them before use.

If the transmitter’s POWER indicator

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

1)

1 hour

7 hours

2)

90 minutes

3)

13 hours

3)

1) at 1 kHz, 1 mW + 1 mW output

2) hours required to fully charge an empty battery

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.

Charge the headphones if the POWER indicator light dims,

flashes, or the sound becomes distorted or noisy.

Notes

 Do not connect the CHARGE plug to anything other

than these headphones.

 The transmitter automatically stops sending RF signals

while charging the battery.

 This system is designed to charge only the supplied

rechargeable battery type BP-HP550-11 for safety. Note

that other types of rechargeable battery cannot be

charged with this system.

 If dry batteries are installed, they cannot be charged.

 Do not attempt to use the supplied BP-HP550-11

rechargeable battery 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).

Tips for volume setting

When watching videos, be careful not to raise the volume

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.”

Setting Connected components

0 dB TV, portable components and other

components with a low output level (initial

settings)

-6 dB Other components

Notes

 Be sure to lower the volume before setting the ATT

switch.

 If audio input is distorted (sometimes, noise can be

heard at the same time), set the ATT switch to “–6 dB.”

Using the headphones

with separately-sold dry

batteries

Commercially available (LR03 (size AAA)) dry batteries can

also be used to power the headphones. Install two

batteries in the same manner as described in step 1 of

“How to use.”

When dry batteries are installed, the battery charge

function is not activated.

Battery life

Battery Approx. usage time

1)

Sony alkaline battery LR03

(size AAA)

28 hours

2)

1) at 1 kHz, 1 mW + 1 mW output

2) Time may vary, depending on the temperature or

conditions of use.

Tips for better reception

Receiving performance

This system 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 reception range or cause

interference.

 Inside a building with walls containing steel beams.

 An area with many steel file cabinets, etc.

 An area with many electrical appliances capable of

generating electromagnetic fields.

 The transmitter is placed on a metal instrument.

 An 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.

Effective area of the transmitter

The optimum distance is up to approximately 45 m (150 ft)

without the system picking up some interference.

However, the distance may vary depending on the

surroundings and environment.

 If the system picks up some noise within the above

mentioned distance, reduce the distance between the

transmitter and the headphones, or select another

channel.

 When you use the headphones inside the effective area

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 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.

Replacing the earpads

The earpads are replaceable. If the earpads become dirty

or worn out, replace them as illustrated below. The

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

around the driver unit as illustrated below.

When the earpad is securely inserted into the groove,

adjust the earpad to the vertical position.

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

 Turn on the headphones.

 Check the connection of the transmitter and A/V

component, AC adaptor, and AC outlet.

 Check that the A/V component is turned on.

 If you connect the transmitter to the headphone jack of

an A/V component, raise the volume level on the

connected A/V component within the range where the

sound is not distorted.

 Change the radio frequency with the CHANNEL selector

on the transmitter, then change the radio frequency to

that of the transmitter with the channel switch on the

headphones.

 Charge the supplied rechargeable battery, or replace

dry batteries with new ones. If the POWER indicator is

still off after charging, take the headphones to a Sony

dealer.

The sound cuts off

 The transmitter turns off if no signal or low signal is

input for 4 minutes. If you connect the transmitter to an

A/V component using the headphone jack, raise the

volume level on the connected A/V component within

the range where the sound is not distorted.

Distorted or intermittent sound

(sometimes with noise)

 Use the headphones near the transmitter, or change

the position of the transmitter.

 If you connect the transmitter to an A/V component

using the headphone jack, lower the volume level on

the connected A/V component within the range where

the sound is not distorted.

 Change the radio frequency with the CHANNEL selector

on the transmitter, then change the radio frequency to

that of the transmitter with the channel switch on the

headphones.

 Charge the supplied rechargeable battery, or replace

dry batteries with new ones. If the POWER indicator is

still off after charging, take the headphones to a Sony

dealer.

Loud background noise

 If you connect the transmitter to the headphone jack of

an A/V component, raise the volume level on the

connected A/V component within the range where the

sound is not distorted.

 Charge the supplied rechargeable battery, or replace

dry batteries with new ones. If the POWER indicator is

still off after charging, take the headphones to a Sony

dealer.

 Use the headphones near the transmitter.

Battery cannot be charged/

POWER indicator does not light up

red

 Install the supplied rechargeable nickel-metal hydride

battery. Dry batteries and rechargeable batteries other

than the supplied cannot be charged.

 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.

Short usage time (the supplied

rechargeable battery)

 Clean the + and - terminal of the supplied rechargeable

battery and the charging terminal of transmitter/

headphone with a dry cloth.

 Recharge the supplied rechargeable battery after the

fully discharged.

 If the usage time is still short, consult your nearest Sony

dealer.

Precautions

Notes on the AC adaptor

 Insert the AC adaptor plug firmly.

 Be sure to use the supplied AC adaptor. Using AC

adaptors with different plug polarity or other

characteristics can cause product failure.

Unified

polarity plug

 Be sure to always use the supplied AC adaptor. Even AC

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

 When this system is not to be used for a long period of

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.

 Do not leave this system in a location subject to direct

sunlight, heat or moisture.

 Avoid exposure to temperature extremes, direct

sunlight, moisture, sand, dust or mechanical shock.

 Please note that water does not splash, this product is

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)

Plug adaptor (stereo mini plug  phono plugs) (1)

Card warranty (1)

Operating Instructions (this manual) (1)

Design and specifications are subject to change without

notice.

To AC outlet

Connect the AC

adaptor.

Insert the plug firmly.

Press and turn the lid counterclockwise.

Match the  terminals on

the battery to the  marks

in the comportment.

Press and turn the lid clockwise.

L (white)

R (red)

Plug adaptor (stereo mini plug

 phono plugs)

Audio out

(L/R) jacks

Stereo system, Blu-ray Disc

player, DVD player, TV*, etc.

* In case of no headphone

jack.

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.

 Using the audio out (L/R) jacks of the A/V component

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.

Set the volume of the A/V component as high as possible, but not so high that the

audio signal becomes distorted.

Rating

More about this manual

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