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How can I fix Hebb Trimline 3650 from arbitrarily speeding up?

My Hebb Trimline 3650 is arbitrarily speeding up, I have attempted to recalibrate 3x. When I go through the calibration steps, what the machine is doing vs what the book says is different. Was never like that before. Could it be the speed pickup?
Carol, August 2010
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