HP LaserJet 3052 Service Manual - Page 84
Basic operation - scanner not working
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Basic operation This chapter presents a functional overview of the HP LaserJet 3050/3052/3055 all-in-one. The following systems are discussed: ● All-in-one functions and operation ● Engine controller unit (ECU) system/power system ● Laser/scanner system ● Image-formation system ● Paper-feed system (printer/product base) and document-feed system (document scanner) ● Formatter functions ● Scanner and ADF functions and operation ● Fax functions and operation (HP LaserJet 3050 all-in-one and HP LaserJet 3055 all-in-one only) The all-in-one consists of the following components: ● The scanner and ADF ● The HP LaserJet 3050 all-in-one uses a fixed contact image scanner (CIS). ● The HP LaserJet 3052/3055 all-in-one use a flatbed charged-coupled device (CCD). ● The printer (product base) ● The formatter ● The line interface unit (LIU) (HP LaserJet 3050 all-in-one and HP LaserJet 3055 all-in-one only) Each of these systems brings its own characteristic functionality to the all-in-one: scanning, printing, and telecommunications (HP LaserJet 3050 all-in-one and HP LaserJet 3055 all-in-one only), respectively. These systems interact to provide copying and faxing capability (only the HP LaserJet 3050 all-in-one and HP LaserJet 3055 all-in-one have faxing capability). ● The document scanner and printer (product base) work together to make copies. ● The scanner and LIU work together to send faxes (HP LaserJet 3050 all-in-one and HP LaserJet 3055 all-in-one only). ● The LIU and printer (product base) work together to receive faxes (HP LaserJet 3050 all-in-one and HP LaserJet 3055 all-in-one only). The ECU controls the operation sequences of the all-in-one. The formatter controls the operation sequences of the LIU (HP LaserJet 3050 all-in-one and HP LaserJet 3055 all-in-one only) and document scanner. 64 Chapter 4 Theory of operation ENWW