HP LaserJet 1100 Service Manual - Page 53
Document scanner system optional
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Document scanner system (optional) The document scanner system consists of the optical system and document pickup and feed systems. The optical system, also known as the contact image sensor, contains the following: • light-emitting diode (LED) array • contact glass • rod lens array • phototransistor array The LED array, which emits light from two LEDs, is controlled by the formatter. Light reflected from documents passes through the rod lens array and focuses on the phototransistor array. The phototransistor array consists of 2,574 phototransistors: 11 driver chips amplify the light reception output in units of 234 phototransistors. The image data is converted and sent from the driver circuits to the formatter. The document pickup and feed systems contain a pickup roller and CIS roller, both of which are driven by the document scanner motor. The following figure shows a simplified Document Scanner document path. 56 Functional Overview C4224-90962