Locking the controls, 1 press the menu button, 3 press the buttons to select on (control lock) – Sony CPD-L181 User Manual
Page 16: 4 press the - button to select lock, Resetting the adjustments, Press the menu button, 3 press the i}/-!) buttons to select —(factory, Preset), 4 press the + button, Locking the controls resetting the adjustments
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