Sony MSW-900 Operation Manual page 264

3
Turn the MENU knob to move the t mark to USER PRESET, and
push MENU knob.
4
The message "PRESET DATA OK? YES NO " appears. In this
case, the t mark is placed to the left of NO and NO blinks.
4
Turn the MENU knob to move the t mark to YES (YES blinks),
and push MENU knob.
Settings for all items in the USER menu are reset to the standard
settings.
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Chapter 4 Adjustments and Settings for Recording