Sony RCP-1500 Operation Manual page 55

You can press items with a red frame around them to clear
their values one by one. If you press c, the values for all
of the items with a red frame around them will be cleared.
To cancel clearing items, press
e Press this to turn OFF all of the functions displayed in c.
f Press a tab to switch to the setting items. Indicators are
displayed for the individual setting items of each tab to
indicate whether or not a setting is ON or OFF (an indicator
lights when the setting item is ON).
[Clear]
again.
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