HP LaserJet 3052 Service Manual - Page 8

Printer (product base) functions ...74 Engine control system (engine control unit and power-supply assembly 75 Print-engine control system 75 Printer (product base) laser/scanner 76 Power system on the power-supply assembly 77 Ac power distribution 77 Dc power distribution 77 Overcurrent/overvoltage 77 High-voltage power distribution 78 Image-formation system ...79 The seven image-formation processes 79 Print cartridge ...80 Printer (product base) paper-feed system 80 Jam detection in the all-in-one 82 Conditions of jam detection 82 HP LaserJet 3050 all-in-one unique components 83 Basic operation ...83 ADF pickup-and-feed system 85 Optical scanning system 87 HP LaserJet 3052/3055 all-in-one unique components 89 Scanner and ADF functions and operation 89 Scanner functions 89 Scanner operation 90 ADF operation 90 ADF paper path and ADF sensors 91 ADF jam detection 91 Fax functions and operation (HP LaserJet 3050 all-in-one and HP LaserJet 3055 all-in-one only) ...92 Computer and network security features 92 PSTN operation ...92 Distinctive ring function ...93 Faxing with Voice over IP services 94 The fax subsystem ...94 Formatter in the fax subsystem 94 LIU in the fax subsystem 95 Safety isolation 95 Safety-protection circuitry 95 Data path ...96 Hook state ...96 Downstream current detection 96 Hook switch control 97 Ring detect ...97 Line-current control 97 Billing- (metering-) tone filters 97 Fax page storage in flash memory 98 Stored fax pages 98 Advantages of flash-memory storage 98 5 Removal and replacement Removal and replacement strategy 100 vi ENWW