Sony HT-ST7 Reference Guide - Page 14

 You may need to cancel the pairing with this system using your BLUETOOTH device first. Pairing cannot be done.  Bring this system and the BLUETOOTH device closer together (refer to "Listening to the audio from BLUETOOTH devices" in the Operating Instructions).  Make sure this system is not receiving interference from a Wi-Fi network, other 2.4 GHz wireless devices, or a microwave oven. If a device that generates electromagnetic radiation is nearby, move the device away from this system. BLUETOOTH connection is disconnected. No sound from the connected device is output. Sound skips.  Bring this system and the BLUETOOTH device closer together.  If a device that generates electromagnetic radiation, such as a Wi- Fi network, other BLUETOOTH devices, or a microwave oven is nearby, move the device away from this system.  Remove any obstacle between this system and the BLUETOOTH device, or move this system away from the obstacle.  Re-position the BLUETOOTH device connected.  Try changing the Wi-Fi frequency of the Wi-Fi router, computer, etc., to 5 GHz band. The sound is not in sync with the image.  When you are watching movies, you may hear the sound with a slight delay from the image. WIRELESS SOUND No sound is output from the subwoofer.  Make sure the AC power cord (mains lead) of the subwoofer is connected.  Make sure the wireless transceivers are inserted correctly (refer to "Inserting the wireless transceivers" in the Operating Instructions).  If the  indicator is off:  Check that the AC power cord (mains lead) of the subwoofer is connected securely.  Turn the subwoofer on by pressing the  button on the subwoofer. 14US  If the  indicator flashes in green slowly or is lit in red:  Move the subwoofer nearer to the Bar Speaker so that the indicator lights up in green.  Check the wireless transmission status with "RF CHK" (refer to "Adjusting the settings" in the Operating Instructions). If "RF NG" appears on the front panel display, push the wireless transceivers into the Bar Speaker and the subwoofer until they click.  Operate it as described in "Enabling the Secure Link function" (page 10).  If the  indicator flashes in green quickly:  First press the  button to turn off the subwoofer, then insert the wireless transceiver into the subwoofer correctly, and press the  button on the subwoofer again.  If the  indicator flashes in red:  Press the  button to turn off the subwoofer, and check that nothing is blocking the ventilation holes of the subwoofer.  A subwoofer is for reproducing bass sound. In the case of input sources that contain very little bass sound components (i.e., a TV broadcast), the sound from the subwoofer may be difficult to hear.  Turn up the subwoofer volume by pressing the SW VOL + button (refer to "Parts and controls" in the Operating Instructions). Sound skips or has noise.  If a device that generates electromagnetic radiation, such as a Wi- Fi network, or a microwave oven is nearby, move the device away from this system.  Remove any obstacle between the Bar Speaker and the subwoofer, or move this system away from the obstacle.  Locate the Bar Speaker and the subwoofer as near as possible. OTHERS The remote control does not function.  Point the remote control at the remote control sensor on the system (refer to "Parts and controls" in the Operating Instructions).  Remove any obstacles in the path between the remote control and the system.  Replace both batteries in the remote control with new ones, if they are weak.