Question about Marantz PMD660 Professional Solid State Recorder

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How can I reset my Marantz PMD660 to the factory configuration?

After the swich turned on, nothing shows on screen, I can only replay a track and the light can come on shortly. I tried to unlock the Key Lock by holding dow the Shift and the Lock buttons but dothing happened. How to unlock? Are there two buttons to reset the hwole thing?

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