Sony HT-ST7 Reference Manual page 13

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.
 If the  indicator flashes in green slowly or is lit in red:
 Move the subwoofer 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 9).
 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.
 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
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.
 Make sure you are pressing the correct button on the remote
control.
TV remote control does not work.
This problem might be solved by using the IR blaster supplied

(page 8).
The Control for HDMI function does not work properly.
 Check the HDMI connection.
 Set up the Control for HDMI function on the TV.
 Make sure that any equipment connected is compatible with
"BRAVIA" Sync.
 Check the Control for HDMI settings on the connected equipment.
Refer to the operating instructions supplied with the connected
equipment.
 If you connect/disconnect the AC power cord (mains lead), wait for
more than 15 seconds and operate the system.
 If you connect the audio output of the video equipment and the
system using a cable other than an HDMI cable, no sound may be
output because of "BRAVIA" Sync. In this case, set "CTRL" to "OFF"
(refer to "Adjusting the settings" in the Operating Instructions) or
connect the audio output jack directly to the TV instead of the
system.
on the
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