Scan cover ASSY is composed with entire cover supporting scan cover, document holding glass and
various double sided tapes gluing them tightly. Slit glass is added to default scan cover ASSY
components for ADF mounted models and the heights of slit glass and contact glass must be equal from
flat bed scan and get identical image quality on ADF scan Also, there should be no gaps between slit
glass and contact glass to move smoothly on CIS operation.