User manual SONY MDR-RF450RK

[. . . ] ⷠInside a building with walls containing steel beams. 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. Check that you have the following items: · Using the headphones for the first time The headphones are powered by either supplied rechargeable batteries or commercially available R6 (size AA) batteries. [. . . ] If it does not detect an audio signal for more than approximately one minute, the transmitter will stop sending RF signals. but the Power indicator remains lighting. When the transmitter receives an audio signal again, it starts sending the RF signals. If the audio signal is very weak, the transmitter does not send RF signals automatically. In this case, make sure the volume of the equipments connected is set to 5 ­ 6. 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. Put on the headphones and the power turns on automatically. Auto power on/off function When you remove the headphones, the power turns off automatically. Do not allow the self adjusting band to be pulled up, otherwise the headphones will be switched on. Turn up the volume to a moderate level with the VOL control, then tune the headphones in to the frequency of the transmitter with the TUNING control until you can hear the audio signal loud and clear. Try the above steps 2 and 4 until the receiving performance becomes better. Continued Mute function If a hissing noise is heard when the headphones are used outside of the effective range (see the next section), the mute function will be activated and the sound will not be heard from the headphones. To restore the sound, move near toward the transmitter. After listening to a program Take the headphones off and rest them away on the holder of the transmitter as shown below. The optimum distance is up to approximately 100 m without the system picking up some interference. However, the distance may vary 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 characteristics is inherent to RF signals, and does not indicate malfunction. By slightly moving the transmitter, location of the dead spot can be changed. 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. [. . . ] if the transmitter is connected to the headphones jack , turn up the volume of the connected audio/video equipment. Select the radio frequency with the CHANNEL selector, then tune in the frequency of the transmitter with the TUNING control. The headphones' POWER indicator light is weak or turned off. ⷠCharge the rechargeable batteries or if the POWER indicator is still off after charging the batteries, replace them with new NC-AA-HJ batteries. [. . . ]