Operation Manual

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Operating Instructions

Cordless Stereo

Headphone System

WARNING

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.

WARNING

You are cautioned that any changes or

modifications not expressly approved in this

manual could void your authority to operate this

equipment.

Owner’s Record

The model number is located on the top of the

transmitter and the inner side of the headband.

The serial number is located at the bottom of the

transmitter and inside the battery compartment of

the headband.

Record these numbers in the spaces provided

below. Refer to them whenever you call upon your

Sony dealer regarding this product.

Model No. MDR-IF125RK

Transmitter TMR-IF125R

Headphones MDR-IF120

Serial No.

Transmitter

Headphones

Welcome!

Thank you for purchasing the Sony MDR-IF125RK

Cordless Stereo Headphone System. Before

operating the unit, please read this manual

thoroughly and retain it for future reference.

Some features are:

• Cordless system that allows you to listen to a

program free from the restriction of a cord.

• Broad horizontal listening area that gives you

superb sound virtually anywhere in the room.

• Self-adjusting headband for fitting your head

perfectly.

• The VOL control adjusts the volume level of both

channels.

• The supplied rechargeable battery can be used to

power the headphones.

3-858-456-12(1)

MDR-IF125RK

Unpacking

Check that you have the following items:

• Transmitter

• AC power adaptor

• Connecting cord (phono plugs ˜ stereo mini

plug)

• Ni-Cd Rechargeable battery NC-AA (HJ)

• Headphones

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 LINE OUT or REC OUT

jacks

b To connect to a headphones jack

AUDIO IN DC IN 9V

Transmitter

Right

channel

(red)

Left

channel

(white)

Stereo system,

TV, VCR, etc.

Connecting

cord (supplied)

to LINE OUT

or REC OUT

jacks

to AUDIO IN B jack

AUDIO IN DC IN 9V

Transmitter

to a headphones

jack (stereo

mini jack)

Connecting cord

(supplied)

to AUDIO IN A jacks

Right channel

(red)

Discman,

WALKMAN

, TV,

VCR, etc.

to a headphones

jack (stereo

phone jack)

Unimatch plug

adaptor (not

supplied)

Left channel

(white)

2 If your AC power adaptor is equipped

with a voltage selector, before connecting

the AC power adaptor to an AC outlet,

set it to the operating voltage in your area

with a screw driver.

3 Connect the transmitter to a power

source.

Notes

• Do not connect to the AUDIO IN A jacks and B jack at the

same time. If you do so, the audio signals may be mixed.

• Use only the supplied AC power adaptor. Do not use

any other AC power adaptor.

• If the plug of the AC power adaptor does not fit in the

AC outlet, use the supplied AC plug adaptor.

• 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.

* WALKMAN is a registered trademark of Sony

Corporation.

AUDIO IN DC IN 9V

Transmitter

to an AC

outlet

to DC IN 9V jack

AC power adaptor (supplied)

Polarity of the plug

AC power adaptor (supplied)

About the infrared

rays communication

The illustration below shows the approximate area

covered by the infrared rays emitted from the

transmitter.

Notes

• This system utilizes infrared rays for communication so

noise (hissing) can be heard in the headphones as you

move farther away from the transmitter. The sound will

also cutoff and noise occur if the infrared rays are

blocked. These are characteristics of infrared ray

communication and do not indicate an equipment

breakdown.

• The infrared rays will not penetrate walls or opaque

glass, therefore, be sure to stay within sight of the

transmitter.

• When you use the headphones inside the area illustrated

in the diagram, the transmitter can be placed in the front,

behind or by the side of the listener.

• The sound you hear varies according to your position

and the transmitter position. Try finding a position

which yields the best sound.

45°

Approx. 7 m (23 ft.)

Transmitter

Approx. 3 m

(118

in.)

Approx. 3 m

(118

in.)

Infrared ray

TMR-IF125R

MDR-IF120

Summary of content (2 pages)

PAGE 1
3-858-456-12(1) 2 Unpacking Check that you have the following items: TMR-IF125R • Transmitter If your AC power adaptor is equipped with a voltage selector, before connecting the AC power adaptor to an AC outlet, set it to the operating voltage in your area with a screw driver. AC power adaptor (supplied) • AC power adaptor Cordless Stereo Headphone System • Connecting cord (phono plugs ˜ stereo mini plug) 3 Connect the transmitter to a power source.
PAGE 2
Charging the rechargeable battery The headphones are powered by a rechargeable battery (supplied) or a dry cell battery (not supplied). Charge the rechargeable battery before use. 1 Setting up the headphones 1 Check that the transmitter power is off. POWER ØON ø OFF/CHG 2 2 Open the battery compartment lid on the left inner side of the headband. Open the battery charger lid on the transmitter.