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Hello, thanks for your question. In locked state, press " STOP/CLEAR " for 3 seconds, there will be a long "beep" denoting that lock is released. Feel welcome to contact us at the 1-800-237-4277 for any question or concerns you might have. Thank you for choosing Sharp.
Sorry, there was a problem. Please try again later.Check the User Manual - very simple procedure - try it, it works, Lee
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