Sony HT-XT100 Operating Instructions Manual page 19

Reset
If the system still does not operate
properly, reset the system as follows:
1
While holding down the / (on/
standby) button on the system,
hold down the INPUT and
VOL (volume) – buttons
simultaneously for 5 seconds.
[RESET] appears on the display, and
the settings of the menu and sound
fields, etc. return to their initial
status.
2
Disconnect the AC power cord
(mains lead).
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