Sony DAV-DZ20 - Manual (Page 65)

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You can return the system parameters, such as
preset stations, to the default settings.
1
Press "/1 to turn on the system.
2
Press x, A, and "/1 on the unit at the
same time.
“COLD RESET” appears in the front panel
display and the default settings are returned.
Returning to the Default
Settings
A "/1 x