Berchtold operon b 710 surgical bed in use.Bed was raised and patient positioned, tried to raise bed higher at start of surgeon portion of surgery, would respond with action, burning smell noted, circuit board with burn area noted near connections.No fire broke out, no smoke noted but black burn area noted on circuit board.No harm to patient, patient was awakened from surgery prior to start until source of melting smell noted, then was put back under general anesthesia for surgery to be completed.
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