ECG PAPER DOES NOT ADVANCE

Question

THE PAPER ADVANCE ROLLER DOES NOT ROTATE. THE PLASTIC GEAR ON THE ROLLER ROTATES WHEN THE LID IS CLOSED AND THE PAGE ADVANCE IS PRESSED.THE ECG PAPER DOES NOT ADVANCE. WHEN I OPEN THE LID, I CAN ROTATE THE PLASIC GEAR ATTACHED TO THE PAPER ADVANCE ROLLER AND THE ROLLER.WHEN I TRY TO HOLD THE PLASTIC GEAR ATTACHED TO THE PAPER ADVANCE ROLLER, I CAN ROTATE THE ROLLER INDEPENDENT OF THE PLASTIC GEAR. I NEED TO USE MODERATE FORCE TO MOVE THE PAPER ADVANCE ROLLER INDEPENDENTLY OF ITS ATTACHED PLASTIC GEAR. WHAT IS THE SOLUTION?