CAUTION The retaining clips on the two center connectors are fragile and can break easily. 4 Grasp the optical unit and slide it to the right to gain access to the belt-tension adjusting plate (callout 4). 5 Loosen one screw (callout 5). 6 Push the adjusting plate to the right to release pressure on the belt, and then remove the belt. 5 4 4 5 Figure 113. Flatbed optical unit (3 of 6) 7 Remove one screw (callout 6) from the left end of the shaft. 76 Figure 114. Flatbed optical unit (4 of 6) C8523-90921 Internal 135