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If the clock is constantly buzzing, there isn't much you can do but remove the clock and send it to a place like ApplianceTimers.com to have the clock refurbished. These older clocks are no longer available and there are no parts for them, so you'd just have to have it refurbished if you wanted to get rid of the buzzing. Usuaily the buzzing is a sign that you have a limited amount of time before the clock fails completely or the oven stops working.
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