Sony MDR-IF420RK Operating Instructions Manual page 15

Problem Solution
Loud Move closer to the
background transmitter. As you move
noise 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
If the transmitter is
connected to the
headphones jack, turn up
the volume of the connected
audio/video equipment.
The headphones' power
indicator light is weak or
turned off.
• Charge the rechargeable
• If you are using the
14
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
from the sunlight.
battery because the
headphones' battery is
weak, or if the power
indicator is still off after
charging the battery, take
the headphones to a Sony
dealer for a replacement
of the rechargeable
battery.
conventional dry battery,
replace it with a new one.
Problem Solution
Loud Noise is heard from the
background connected audio equipment.
noise • Check if the INPUT
SOURCE selector is set to
the right position.
• Disconnect the connecting
cord with the power of
the transmitter on and
check if the noise is heard
from the headphones. If
the noise disappears, the
connected equipment is
the cause to make that
noise.
• When using more than
two transmitters, turn off
the power of the second
transmitter or move it so
that the area covered by
the infrared rays does not
overlap each other.
Surround Press the SURROUND
effect button.
(MDR-
Check that the input signal
IF520RK)
is stereo.
cannot be
Check that the unit is
obtained.
connected to audio/video
equipment properly.
Open the housing cap.
Check if the charging
The battery
indicator lights on. If not,
cannot be
put the headphones on the
charged.
transmitter correctly so that
the charging indicator lights
on.
The dry battery is installed.
• Install the supplied
rechargeable battery.
The rechargeable battery
that is not supplied is
installed.
• Install the supplied
rechargeable battery.