Sony MDR-IF125RK User Manual download pdf (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 Check that the transmitter power is off.

2 Open the battery charger lid on the

transmitter.

3 Insert the supplied rechargeable battery

NC-AA (HJ), making sure to match

battery polarity with the ‘ and ’ marks

on the charger case.

The CHARGE indicator then lights up

and charging starts.

4 Close the battery charger lid on the

transmitter.

Charging time and battery life

About 24 hours is required to fully charge the

rechargeable battery. Once fully charged, the

battery provides about 35 hours of operation.

One hour charging of the rechargeable battery

enables about 1 hours and 30 minutes of operation.

Notes

• This system is designed to charge only the

supplied rechargeable battery for safety. This

system cannot charge other batteries even if they

have the same shape.

• Since little electric current is used for charging,

there is no need to worry about overcharging.

• As this system is not affected by the memory

effect of the Ni-Cd battery, recharging the

supplied battery before it is completely

discharged is not a problem.

• When the transmitter power is turned on, the

battery charger does not operate.

When to recharge the battery

Recharge the supplied battery when the POWER

indicator on headphones dims, and hissing or noise

occurs.

If the POWER indicator dims even after full

charging, the battery is completely dead. To

purchase a new rechargeable battery, consult your

nearest Sony dealer.

Troubleshooting

No sound/Muffled sound

/ Turn on the transmitter and the headphones first,

then put on the headphones.

/ Check the connection of the audio/video

equipment or the AC power adaptor.

/ Check that the audio/video equipment is turned

on.

/ Turn up the volume on the connected audio/video

equipment, if the transmitter is connected to the

headphones jack. (Around level 5 or 6 on the

volume control should be appropriate.)

/ The mute function is activated.

• Check if there is any object between the

transmitter and the headphones.

• Use the headphones near the transmitter.

• Change the position and angle of the transmitter.

/ The POWER indicator on the headphones dims.

• Recharge the supplied battery. If there is no sign

of improvement, please consult your nearest Sony

dealer.

• Replace the battery of the headphones.

Distortion

/ If the transmitter is connected␣ to␣ the␣ headphones

jack, turn down the volume of the connected

audio/video equipment. (Around level 5 or 6 on

the volume control should be appropriate.)

/ Recharge the supplied battery.

/ Replace the battery of the headphones.

Loud background noise

/ Move closer to the transmitter. As you move away

from the transmitter, more noise is likely to be

heard. This is inherent to infrared ray

communication and does not mean that there is a

problem with the unit itself.

/ Check that there is no object between the

transmitter and the headphones.

/ Check that the infrared sensors are not covered

with your hands or hair.

/ Change the position or angle of the transmitter.

• The headphones are used by a window where the

sunlight is too strong.

n Draw the curtains/blind to shut out the direct

sunlight, or use the headphones away form

the sunlight.

/ If the transmitter is connected to the headphones

jack, turn up the volume of the connected audio/

video equipment. (Around level 5 or 6 on the

volume control should be appropriate.)

/ Recharge the supplied battery.

/ Replace the battery of the headphones.

Specifications

General

Modulation system

Frequency modulation

Carrier frequency Right 2.8 MHz

Left 2.3 MHz

Frequency response

18 – 22,000 Hz

Transmitter TMR-IF125R

Power source DC IN 9V jack accepts power supplied

from the AC power adaptor for use on

the following voltages:

Audio input Phono jacks/stereo mini jack

Dimensions Approx. 152 × 40 × 72 mm

(6 × 1

/2 × 2

/4 in.) (w/h/d)

Mass Approx. 88 g (3.1 oz.)

Headphones MDR-IF120

Power source DC 1.5 V, 1 × R6 (size AA) battery

Mass Approx. 130 g (4.6 oz.) including battery

Optional accessories

Plug adaptor

PC-236HG (stereo mini jack ˜ monaural mini plug)

PC-234HG (stereo mini jack ˜ stereo phone plug)

Connecting cords

RK-C510HG/RK-C515HG/RK-C520HG

(phono plug × 2 ˜ phono plug × 2)

RK-G136HG (stereo mini plug ˜ stereo mini plug)

RK-G129HG (stereo mini plug ˜ phono plug × 2)

Design and specifications are subject to change without

notice.

Setting up the

headphones

1 Open the battery compartment lid on the

left inner side of the headband.

2 Insert the supplied rechargeable battery

NC-AA (HJ) by matching the ‘ and ’

on the battery to the ‘ and ’ in the

battery compartment.

Make sure that the battery is charged.

3 Close the battery compartment lid.

Using a dry cell battery

Insert the dry cell battery into the headphone

battery compartment the same as when inserting

the rechargeable battery.

Battery life

When to replace the battery

Replace the battery with a new one when the

POWER indicator on the headphones dims, and a

hissing noise increases.

Listening to a program

1 Turn on the audio/video equipment

connected to the transmitter.

2 Turn on the transmitter. The infrared

emitters light up.

3 Turn on the power of the headphones.

The power indicator lights in red.

4 Put on the headphones.

5 Adjust the volume.

Mute function

If a hissing noise is heard when the infrared rays

are obstructed, or the headphones are used outside

of the effective range (see “About the infrared rays

communication”), the mute function will be

activated and the sound will not be heard from the

headphones. To restore the sound, move nearer

toward the transmitter or remove the obstruction.

After listening to a program

Take the headphones off before turning off the

headphones and the transmitter. Otherwise you

may hear some noise when the infrared rays are

suddenly cut off.

Note

The infrared emitters light up when the transmitter is

turned on. The brightness of the emitters may not be

uniform, however, this is not a malfunction.

Battery

Sony alkaline battery

LR6/AM3 (N)

Sony battery

R6P/SUM-3 (NS)

Approx. hours

100

Precautions

• Before operating the system, check that the

operating voltage of your system is identical with

the voltage of your local power supply.

• The CE mark on the unit is valid only for

products marketed in the European Union.

• When the headphones is not to be used for a long

period of time, remove the battery to avoid

damage caused by battery leakage and

subsequent corrosion.

• When the transmitter is not to be used for a long

period of time, disconnect the AC power adaptor

from the AC outlet holding the plug. Do not pull

on the cord.

• Do not leave the cordless stereo headphones

system in a location subject to direct sunlight,

heat or moisture.

Notes on headphones

Preventing hearing damage

Avoid using headphones at high volume. Hearing

experts advise against continuous, loud and

extended play. If you experience a ringing in your

ears, reduce the volume or discontinue use.

Caring for others

Keep the volume at a moderate level. This will

allow you to hear outside sounds and to be

considerate to the people around you.

If you have any questions or problems concerning

the system that are not covered in this manual,

please consult the nearest Sony dealer.

Be sure to bring the headphones and the transmitter

to the Sony dealer when requiring repair work.

Replacing the Ear

Pads

When the ear pads become dirty or damaged,

consult your nearest Sony dealer and replace them

as illustrated below.

Where purchased

U.S.A./Canada

U.K.

European countries

Other countries

Japan (Except for Japanese

domestic model)

Operating voltage

120 V AC, 60 Hz

230 – 240 V AC, 50 Hz

220 – 230V AC, 50 Hz

220 – 230 V AC, 50/60 Hz

or 120 V AC, 60 Hz

110 – 120 V/220 – 240 V

AC, 50/60 Hz

POWER

ØON

ø OFF/CHG

POWER

ØON

ø OFF/CHG

Remove the old ear

pad by pulling it out.

Place the new ear

pad on the housing

as illustrated.

Make sure that the ear

pad is securely replaced.

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Sony MDR-IF125RK User Manual Page 2

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