Sony MDR-RF940RK Operating Instructions

Wireless Stereo
Headphone System
Operating Instructions
Manual de instrucciones
MDR-RF940RK
Sony Corporation © 1996
Printed in Japan
English
thoroughly and retain it for future
WARNING reference.
Some features are:
• Wireless system that allows you to
To prevent fire or shock hazard,
listen to a program free from the
do not expose the unit to rain or
restriction of a cord within 130 feet
moisture.
from the transmitter.
To avoid electrical shock, do not
• High fidelity sound reproduction
open the cabinet. Refer servicing
• Compact transmitter which operates
to qualified personnel only.
on battery power and AC power
supplied through the supplied AC
WARNING
You are cautioned that any changes or power adaptor
modifications not expressly approved in • Comfortable Circum-aural
headphones
this manual could void your authority to
• Automatic ON/OFF function on
operate this equipment.
headphones to preserve battery power
• Mute function to avoid noise when no
Owner's Record
audio signal is available.
The model number is located inside the
battery compartment of the transmitter
and the right inner side of the head
band.
Notes on receiving
The serial number is located inside the
battery compartment of the transmitter performance
and inside of the battery compartment of
the headphones. The system for this equipment utilizes very
high frequency signals in the 900 MHz band
Record these numbers in the spaces
so the receiving performance may deteriorate
provided below. Refer to them
due to the surroundings. The following
whenever you call upon your Sony
examples illustrate conditions that may
dealer regarding this product.
reduce the possible receiving range or cause
interference with reception.
Model No. MDR-RF940RK
• Inside a building with walls containing
Transmitter TMR-RF940R
steel beams.
Headphones MDR-RF940R
• Area with many steel file cabinets, etc.
Serial No.
• Area with many electrical appliances
Transmitter
capable of generating electromagnetic
Headphones
noise.
• Transmitter is placed on a metal
instrument.
• Area facing roadways.
• Noise or interfering signals exist in the
Welcome!
surroundings due to radio transceivers in
trucks, etc.
Thank you for purchasing the Sony • Noise or interfering signals exist in the
MDR-RF940RK Wireless Stereo surroundings due to wireless
communication systems installed along
Headphone System. Before operating
roadways.
the unit, please read this manual
3-858-839-12(1)
2
( Getting started
Unpacking
To obtain power from an AC outlet
Check that you have the following
items:
• The transmitter
AC power
adaptor
(supplied)
Notes
• AC power adaptor
•When the AC power adaptor is connected to the
transmitter, internal batteries are automatically
disconnected.
•Use only the supplied AC power adaptor. Do
not use any other AC power adaptor.
• Connecting cord (phono plugs ˜
stereo mini jack)
•When you connect the connecting cord directly
to an earphone jack, the audio signal will not be
• The headphones output through the right channel. In such a case,
use the separately sold PC-236HG plug adaptor.
To obtain power from batteries
The transmitter can also be operated by
use of four R6 (size AA) batteries.
1
Setting up the
transmitter
1 2
Connect the transmitter to audio/
video equipment.
a To connect to a headphones jack
Transmitter
3
to headphones jack
(stereo mini jack)
Battery life
Battery
Discman,
Walkman, TV,
Sony alkaline battery
VCR, etc. LR6 (SG)
Sony battery R6P (SR)
b To connect to LINE OUT or REC OUT
jacks
When to replace the batteries
Replace all the batteries with new ones
when the POWER indicator dims, and a
hissing noise increases.
Transmitter
Setting up the
headphones
1
Connecting
cord (supplied)
Left channel Right
channel (red)
(white)
to LINE OUT or
REC OUT
Stereo system,
TV, VCR, etc.
2
Connect the transmitter to a power Insert two R6 (size AA) batteries by
source. matching the + and – on the batteries
to the + and – in the battery
compartment.
Transmitter
to an AC
outlet
to DC IN
] ]
4.5V jack
}
3
Close the battery compartment lid.
Polarity of the plug
Battery life
Battery Approx. hours
Sony alkaline battery 40
Open the battery compartment lid LR6 (SG)
on the bottom of the transmitter.
Sony battery R6P (SR) 20
When to replace the batteries
Replace both batteries with new ones
when the POWER indicator dims, and a
hissing noise increases.
Insert four R6 (size AA) batteries by
matching the + and – on the batteries
Notes on batteries
to the + and – in the battery
To avoid damage to the system caused
compartment.
by battery leakage and corrosion;
– Install the batteries with the correct
polarity.
– Do not try to recharge the batteries.
– Remove the batteries if the system is
not to be used for a long period of
time.
In case of battery leakage, wipe off any
deposit in the battery compartments
Close the battery compartment.
before installing new batteries.
( Operating the system
Listening to a
program
Approx. hours
40
1
Select the radio frequency with the
CHANNEL selector switch.
20
Select the same channel on the
headphones and the transmitter.
Open the battery compartment lid
CH1
on the left inner side of the head
band.
2
Turn on the audio/video equipment
then the transmitter.
POWER
3
Put on the headphones and the
Replacing the ear
power turns on automatically.
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
4 out of the groove on the housing.
Adjust the volume.
Note
2
Place the new ear pad on the
If the transmitter is connected to the headphones
housing and insert the edge of the
jack of the source equipment, set the volume of
that equipment as high as possible without pad into the groove as illustrated.
distorting the audio signal.
Auto power on/off function
When you remove the headphones, the
power turns off automatically. Do not
apply pressure to the left ear pad when
not using the headphones, otherwise the
headphones will be switched on.
Make sure that the entire edge of the ear
pad is securely inserted into the groove.
/
( Additional information
Mute function
Precautions
If a hissing noise is heard when the
headphones are used outside of the
effective range (see the next section), the
• When the headphones are not to be
mute function will be activated and the
used for a long period of time, remove
sound will not be heard from the
the batteries to avoid damage caused
headphones. To restore the sound,
by battery leakage and subsequent
move near toward the transmitter.
corrosion.
• When the transmitter is not to be used
After listening to a program
for a long period of time, disconnect
Take the headphones off before turning
the AC power adaptor from the AC
off the transmitter. If you turn off the
outlet holding the plug. Do not pull
transmitter first, you may hear some
on the cord.
noise.
Also remove the batteries to avoid
damage caused by battery leakage and
subsequent corrosion.
• Do not leave the wireless stereo
The effective areas
headphone system in a location subject
of the transmitter
to direct sunlight, heat or moisture.
Notes on headphones
The optimum distance is up to
Preventing hearing damage
approximately 130 feet (40m) without
Avoid using headphones at high
the system picking up some interference.
volume. Hearing experts advise against
However, the distance may vary
continuous, loud and extended play. If
according to the surroundings and
you experience a ringing in your ears,
environment. If the system picks up
reduce the volume or discontinue use.
some noise while using it within the
above mentioned distance, reduce the
Caring for others
distance between the transmitter unit
Keep the volume at a moderate level.
and the headphones, or select the other
This will allow you to hear outside
channel.
sounds and to be considerate to the
people around you.
Notes
•When you use the headphones inside the
If you have any questions or problems
effective areas of the transmitter, the transmitter
concerning the system that are not
can be placed in any direction from the listener.
•Even within the signal reception area, there are
covered in this manual, please consult
CH2
some spots (dead point) where the RF signal can
the nearest Sony dealer.
not be received. This characteristics is inherent to
RF signals, and does not indicate malfunction.
Be sure to bring the headphones and the
By slightly moving the transmitter, location of
the dead point can be changed.
transmitter to the Sony dealer when
requiring repair work.
Troubleshooting
Problem Solution
No sound/ Turn on the transmitter
Muffled sound 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.
The mute function is
activated.
Use the headphones near
the transmitter.
Replace both batteries of the
headphones.
Replace the batteries in the
transmitter if the
transmitter is used by
battery operation.
Distortion If the transmitter is
connected to the headphones
jack, turn down the volume
of the connected audio/
video equipment.
Replace both batteries of the
headphones.
Replace the batteries in the
transmitter if the
transmitter is used by
battery operation.
Move closer to the
Loud
transmitter. As you move
background
away from the transmitter,
noise
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.
If noise is heard when the
transmitter is hooked to the
TV headphones jack, try
connecting from LINE OUT.
Replace both batteries of the
headphones.
Replace the batteries in the
transmitter if the
transmitter is used by
battery operation.
Specifications
General
Carrier frequency
913.5 – 914.5 MHz
Channel Ch1, Ch2
Modulation FM stereo
Frequency response
18 – 22,000 Hz
Transmitter
RF Power Less than 94 dBµV/m at 3 m
Power source DC 4.5 V: supplied AC power
adaptor
DC 6 V: 4 x R6 (size AA) battery
Audio input stereo mini plug
Dimensions Approx. 90 mm dia x 35 mm
(3 5 / x 1 7 / in.) (w/h)
8 16
Mass Approx. 200 g (7.1 oz.)
incl.batteries
Headphones
Power source DC 3 V: 2 x R6 (size AA) battery
Mass Approx. 270 g (9.5 oz.) incl.
batteries
Optional accessories
Plug adaptor PC-236HG
(stereo mini jack ˜ monaural mini plug)
Design and specifications are subject to change
without notice.