HP LaserJet 3052 Service Manual - Page 109
HP LaserJet 3052/3055 all-in-one unique components, Scanner and ADF functions and operation
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HP LaserJet 3052/3055 all-in-one unique components This section presents an overview of the relationships between unique major components in the HP LaserJet 3052/3055 all-in-one. This section describes the optical scanning system and ADF pickup and feed system used in the HP LaserJet 3052/3055 all-in-one. It does not describe the image-formation system that is common to the HP LaserJet 3050/3052/3055 all-in-one. For information about image formation, see Image-formation system on page 79. Scanner and ADF functions and operation The following sections describe how the document scanner and the ADF function. Scanner functions The scanner uses a light source, a color-separation method, and a charge-coupled device array (CCD) to collect optical information about the document and transform that into an image file. The scanner consists of these elements: ● A lamp (cold-cathode fluorescent bulb) ● Five mirrors and a lens ● A CCD Figure 4-14 HP LaserJet 3052/3055 all-in-one optical system The scanner lamp illuminates a small strip of the document (called the raster line). The mirrors direct the light through the lens to the CCD. The CCD senses and records the light, creating an analog representation of the raster line. If the ADF is being used, the document then advances in the ADF to the next raster line. If the flatbed is being used, the scanner module advances to the next raster line. This advancing and collection process continues to the end of the sheet. The image data is collected in the motor controller board, where it is processed and sent to the formatter. The formatter then handles the image data, outputting it as a copy, sending it through the LIU as a fax (in the HP LaserJet 3055 all-in-one), or directing it to the computer as scanner output. ENWW HP LaserJet 3052/3055 all-in-one unique components 89