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Try this: (from the user manual)
Pro-Tect Plus™ (Child Lock) Feature
This feature is useful to tamper proof your timer recordings from unwanted changes and/or protect the VCR from misoperation by other users in the household.
To Lock the VCR:
Press and hold POWER or VCR on the remote for
approximately six seconds to turn on the Pro-Tect Plusª feature.
SAFE appears in the VCR front panel to let you know the feature is activated.
To Unlock the VCR:
Press and hold VCR button on the remote for approximately six seconds to unlock the VCR.
Best of luck!
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