Ricoh FW780 Service Manual - Page 42
Exposure, Overview
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3. EXPOSURE 3.1 OVERVIEW [F] [D] [H] [E] [G] [I] [B] [A] [C] Light from the exposure lamp [A] reflects off the original and through the fiber optics [B] to the OPC drum [C]. During exposure, the original moves across the exposure glass at the same speed as the drum's peripheral velocity. The platen plate [D] presses the original [E] flat against the exposure glass [F] just above the fiber optic array. This ensures that the image is properly focused. (The original must be within 0.2 mm of the exposure glass surface.) The exposure lamp is a 140 V, 26 W fluorescent lamp. The original registration sensor [G] detects when the original leading edge passes the front of the exposure glass. The original flattener [H] holds the leading edge of the original to ensure that original registration sensor detects the original at the correct time. The light sensor [I] monitors the intensity of the exposure lamp output. SM 2-6 A163