Mechanical structure The ADF optical assembly and the flatbed optical assembly both have a complete scanning system. This enables single-pass duplex scanning of a document. ADF optical assembly Scanning lamps Flatbed optical assembly Figure 38. Mechanical structure (1 of 2) Table 16. Mechanical structure 68 Chapter 5 Theory of operation C8523-90921 Description Part number Qty ADF optical assembly RG5-6307-000CN 1 lamp assembly (includes shading filter) RG5-6322-000CN 1 lens N/A 1 mirrors N/A 5 Flatbed optical assembly RG5-6263-000CN 1 lamp assembly (includes shading filter) RG5-6323-000CN 1 lens N/A 1 mirrors N/A 5