HP 8150dn Service Manual - Page 244

Copy Module
Power Supply and Main Board Tray Assembly • The Fan Assembly activates while the copy module is turned on. It may run slower if Power Save is on. • The Power Supply provides AC to DC power conversion. • The Control PCA controls copy module electromechanical functions, imaging system, and errors. It also has an EEPROM which stores the default factory settings particular to each copy module, such as serial number and calibration settings. • When you replace the Control PCA, retain the EEPROM from the old PCA and replace it on the new PCA in order to retain the default settings for the HP Digital Copier. • The Back PCA Board provides a connection between the Copy Processor Board and the Control PCA. • The Copy Processor Board is explained on page 237.
ADF Unit • The ADF Assembly provides all mechanics to move paper. • The LED Assembly provides feedback from the paper empty sensor to the user. If paper is loaded correctly, the LED is green and a tone sounds. • The ADF Motor Unit drives the ADF's paper handling mechanics. • The Sensor Unit Assembly has 8 sensors (4 paper width sensors to detect standard paper types; 1 ADF open sensor, and 3 paper-handling sensors). • Charge Coupled Device (CCD)/Optics convert reflected light to electronic signals. Also includes mirrors and lenses to point the reflected light. • The ADF Lamp illuminates the original document. • The Lamp Inverter PCA controls and provides power to the ADF Lamp. C4265-90907Copy Module Functional Overview 239