Sony MDR-IF125RK User's Manual

Sony Headphones User's Manual - MDR-IF125RK.
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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)

Sony Corporation © 1996  Printed in Korea

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

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

B

R

AUDIO IN

DC IN 9V

L

¥

A

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

B

R

AUDIO IN

DC IN 9V

L

¥

A

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)

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.

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.

B

R

AUDIO IN

DC IN 9V

L

¥

A

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°

45°

Approx. 7 m (23 ft.)

Transmitter

Approx. 3 m

(1181/

8 in.)

Approx. 3 m

(1181/

8 in.)

Infrared ray

TMR-IF125R

MDR-IF120

0.553021s