Sony MDR-RF975RK manual

3-233-606-12(1)

Wireless Stereo Headphone System

Operating Instructions

Manual de instrucciones

MDR-RF975RK

Notes on receiving performance

The system for this equipment 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 possible receiving range or cause interference with reception.

•Inside a building with walls containing steel beams.•Area with many steel file cabinets, etc.

•Area with many electrical appliances capable of generating electromagnetic noise.

•Transmitter is placed on a metal instrument.•Area facing roadways.

•Noise or interfering signals exist in the surroundings due to radio transceivers in trucks, etc.

•Noise or interfering signals exist in the surroundings due to wireless communication systems installed along roadways.

NGetting started

Unpacking

Check that you have the following items:•The headphones•The transmitter•AC power adaptor•Unimatch plug adaptor (stereo mini jack t stereo phone plug)•Connecting cord (phono plugs ystereo mini plug), 1 m

Setting up the transmitter

1 Connect the transmitter to audio/video equipment. Select one of the hookups below depending on the jack type:

ATo connect to a headphones jack

Transmitter	to AUDIO IN
	to AUDIO IN
	A jacks

CTo connect to TV, etc.

If noise occurs when the transmitter is connected to the headphone jack of your TV or VCR, set the NOISE FILTER switch to ON.

Transmitter

					to AUDIO IN
					A jack
OFF ON	B	R A	L	DC IN 9V	1 2 3
OFF ON	B	R A	L		1 2 3
NOISE FILTER	AUDIO IN				CHANNEL
Right channel				Left channel
(red)				(white)

Connecting cord (supplied)to stereo mini jackTV, etc.Notes

•If you connect the transmitter to LINE OUT or REC OUT jack, do not set the NOISE FILTER switch to ON. Otherwise, the volume will be limited.

•The NOISE FILTER switch effects the sound only in cases such as connection diagram C. In diagrams A and B, the switch has no effect.

•When the transmitter is placed on or near a TV, it may pick up a noise. In such case, place the transmitter away from the TV.

2 Connect the transmitter to an AC outlet using the supplied AC power adaptor.

Notes

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

Polarity of the plug

• 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.

• If the connected equipment has the AVLS (Automatic

Volume Limiter System) function, be sure to turn the

function off when using the transmitter. Otherwise, you

To recharge the headphone battery after use

Since the charger shuts itself off in response to its internal timer after 24 hours, there is no need to worry about overcharing.

Charging and using hours

Approx. charging	Approx. using time*
hours

1	60 minutes

24**	25 hours

* at 1 kHz, 1 mW + 1 mW output

** The hours required to fully charge empty battery

NOperating the system

Listening to a program

1 First turn on the audio/video equipment and start playing.2 Remove the headphones from the transmitter.The transmitter’s power indicator will light in red.3 Select the radio frequency with the CHANNEL selector.

Sending RF signals from the Transmitter

The transmitter starts sending the RF signals automatically, when it detects audio signals from the equipment connected.

If it does not detect an audio signal for more than approximately four minutes, the transmitter will stop sending RF signals, and the power indicator turns off.

When the transmitter receives an audio signal again, it starts sending the RF signals, and the power indicator will light in red again.

If the audio signal is very weak, the transmitter does not send RF signals. If the transmitter is connected to a headphone jack, make sure the volume of the equipment connected is set to 5 – 6 or higher.

You may not hear the beginning of the sound from the headphones until the transmitter starts sending the RF signals after detecting an audio signal.

Note

If the transmitter is connected to the headphones jack of the source equipment, set the volume of that equipment as high as possible without distorting the audio signal.

Auto power on/off function

When you remove the headphones from your head, the power turns off automatically. Do not allow the self adjusting band to be pulled up, otherwise the headphones will be switched on.

The power turns on.

Note

If a hissing noise is heard move closer to the transmitter.

After listening to a program

Take the headphones off and rest them away on the transmitter, and recharge them.

Note

Do not hang the headphones by the self adjusting band, otherwise, the self adjusting band will be pulled up and the headphones will be switched on.

The effective areas of the transmitter

Replacing the ear pads

When the ear pads become dirty or damaged, you can get replacements from your Sony dealer. Replace them as illustrated below.

1 Remove the old ear pad by pulling it out of the groove on the housing.

2 Place the new ear pad on the driver unit and insert the edge of the pad into the groove as illustrated.

Make sure that the entire edge of the ear pad is securely inserted into the groove.

NAdditional information

Precautions

• 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.

Troubleshooting

No sound/Muffled sound,Turn on the transmitter 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.

,Change the radio frequency with the CHANNEL selector on the transmitter, then press the TUNING button again.

,The mute function is activated.Use the headphones near the transmitter.,The headphones’ POWER indicator light is weak or turned off.

•Charge the built-in rechargeable battery or if the POWER indicator is still off after charging the built-in rechargeable battery, take the headphones to a Sony dealer for replacement of the rechargeable battery.

,If you connect the transmitter to LINE OUT or REC OUT jack of an audio reproducer, make sure that the NOISE FILTER switch is set to OFF.

,Make sure that the NOISE FILTER switch is set to either ON or OFF (If the switch gets stuck between ON and OFF, the sound will be cut off).

Distortion

,If the transmitter is connected to the headphones jack, turn down the volume of the connected audio/video equipment.

,Change the radio frequency with the CHANNEL selector on the transmitter.

,The headphones’ POWER indicator light is weak or turned off.

•Charge the built-in rechargeable battery or if the POWER indicator is still off after charging the built-in rechargeable battery, take the headphone to Sony dealer for replacement of the rechageable battery.

,If you connect the transmitter to LINE OUT or REC OUT jack of an audio reproducer, make sure that the NOISE FILTER switch is set to OFF.

Loud background noise

, Move closer to the transmitter. As you move

away from the transmitter, more noise is likely to

be heard.

, If the transmitter is connected to the headphones

jack, turn up the volume of the connected audio/

video equipment.

, Change the radio frequency with the CHANNEL

selector on the transmitter, then press the

DC IN 9V

OFF ON

1 2 3

NOISE FILTER

AUDIO IN

CHANNEL

will have to turn up the volume of the headphones, and

that may cause noise.

• Do not place the transmitter near a fluorescent lamp, etc.

when using the system.

The optimum distance is up to approximately 150 feet (46 m) without the system picking up some interference. However, the distance may vary

• Do not leave the wireless stereo headphone

system in a location subject to direct sunlight,

heat or moisture.

TUNING button again.

, The headphones’ POWER indicator light is weak

or turned off.

• Charge the built-in rechargeable battery or if the

English

Owner’s Record

The model number is located at the bottom of the transmitter and on the inside of the left housing hanger of the headphones.

The serial number is located at the bottom of the transmitter and on the backside of the left housing hanger of the headphones.

Record these numbers in the spaces provided below. Refer to them whenever you call upon your Sony dealer regarding this product.

Model No. MDR-RF975RKTransmitter TMR-RF975RHeadphones MDR-RF975RSerial No.TransmitterHeadphones

WARNING

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.rbrc.org/.Caution:Do not handle damaged or leaking Nickel Metal Hydride batteries.

Right channel (red)

Connecting cord (supplied)

Unimatch plug adaptor (supplied) to headphones jack (stereo phone jack)

Left channel (white)to headphones jack (stereo mini jack)Discman, MD, WALKMAN*, VCR, etc.

*WALKMAN is a registered trademark of Sony Corporation.

Charging the headphone battery

Using the headphones for the first time

When you use the headphones for the first time, charge the battery in the following manner.

1 Connect the transmitter to a power source.

Transmitter

to an AC outlet

1 2 3

CHANNEL

4 When you put on the headphones the headphone power turns on automatically.5 Turn up the volume to a moderate level with the VOL control.Press the TUNING button briefly for automatic tuning of the headphones.If you do not receive a clear audio signal,

according to the surroundings and environment. If the system picks up some noise while using it within the above mentioned distance, reduce the distance between the transmitter unit and the headphones, or select the other channel.

Notes

•When you use the headphones inside the effective areas 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 spot) where the RF signal can not be received. This is a characteristic inherent to RF signals, and does not indicate malfunction. By slightly moving the transmitter, location of the dead spot can be changed.

Notes on headphonesPreventing 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.

POWER indicator is still off after charging the

built-in rechargeable battery, take the

headphone to Sony dealer for replacement of

the rechageable battery.

, If you connect the transmitter to LINE OUT or

REC OUT jack of an audio reproducer, make sure

that the NOISE FILTER switch is set to OFF.

Specifications

General

Carrier frequency
	913.5 – 914.5 MHz
Channel	Ch1, Ch2, Ch3
Modulation	FM stereo
Frequency response
	18 – 22,000 Hz
Transmitter TMR-RF975R
Power source	DC 9 V: supplied AC power adaptor
Audio input	phono jacks/stereo mini jack
Dimensions	Approx. 130 ⋅ 135 ⋅ 150 mm

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.

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 Direct Response Center 1-(800)-222-7669or write to:Sony Direct Response Center 12451 Gateway Blvd.Fort Myers, Fl 33913Declaration of Conformity

Trade Name:	SONY
Model No.:	MDR-RF975R
	(Headphones Unit)
Responsible Party: Sony Elecoronics Inc.
Address:	680 Kinderkamack Road,
	Oradell, NJ 07649 USA
Telephone No.:	201-930-6972

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 intereference that may cause undesired operation.

Welcome!

Thank you for purchasing the Sony MDR-RF975RK Wireless Stereo Headphone System. Before operating the unit, please read this manual thoroughly and retain it for future reference.

Some features are:

•Wireless system that allows you to listen to a program free from the restriction of a cord

•High fidelity sound reproduction

•A compact transmitter with an AC power adaptor (supplied) enables simple charging of the headphone battery. Just by placing the headphones on the transmitter, headphone battery can be charged.

•Comfortable Circum-aural headphones with self-adjusting head band•Automatic ON/OFF function on headphones to preserve battery power

BTo connect to LINE OUT or REC OUT jacks

Transmitter

DC IN 9V

OFF ON

1 2 3

NOISE FILTER

AUDIO IN

CHANNEL

to AUDIO IN B jack

Connecting cord (supplied)

Left channel	Right channel
(white)	(red)

to LINE OUT or REC OUT jacksStereo system, VCR, etc.

To DC IN 9 V jackAC power adaptor (supplied)2 Place the headphones on the transmitter.

Place the headphones on the transmitter such that the charging pins on the transmitter engage the charging contacts on the bottom of the housing. The charge indicator on the transmitter will light in green to indicate that the battery is being charged. Once 24 hours have elapsed since the start of battery charging, the charger automatically shuts off, and the green indicator goes out.

press it again.TUNING buttonVOL controlTry the above steps 3 and 5 until the receiving performance becomes better.

Disposing of the headphones

Be sure to remove the built-in rechargeable batteries from the headphones before you dispose of the headphones.

First remove the left headphone’s ear pad. You will see four screws. Remove the four screws and open the housing.

	(5 1/4 ⋅ 5 3/8 ⋅ 6 in.) (w/h/d)
Mass	Approx. 200 g (7 oz.)
Headphones MDR-RF975R
Power source	DC 2.4 V: Built-in rechargeable
	battery
Mass	Approx. 350 g (12.3 oz.) incl.
	built-in rechargeable battery
Built-in Ni-MH rechargeable battery
Model name	NH-AAC
Voltage	1.2 V
Capacity	1,000 mAh
Optional accessory
Plug adaptor	PC-236HG (stereo mini jack y
	monaural mini plug)

Design and specifications are subject to change without notice.