HP LaserJet M4345 - Multifunction Printer Service Manual

High-voltage power supply ............................................................................................... 124
Low-voltage power supply ................................................................................................ 125
Overcurrent/overvoltage protection .................................................................................. 127
Toner detection ................................................................................................................. 127
Cartridge detection ............................................................................................................ 127
Laser/scanner system ....................................................................................................................... 128
Laser/scanner control ....................................................................................................... 129
Image-formation system .................................................................................................................... 131
Print cartridge .................................................................................................................... 132
Cartridge memory ............................................................................................ 132
Image-formation process .................................................................................................. 133
Pickup, feed, and delivery system ..................................................................................................... 135
Pickup-and-feed block ...................................................................................................... 138
Printing from tray 1 ........................................................................................... 139
Printing from tray 2 ........................................................................................... 140
Media-size detection ....................................................................... 141
Cassette media-size detection ....................................... 141
Media-length detection ................................................... 141
Media-width detection ..................................................... 141
Cassette pickup operation ............................................................... 141
Lifter-driver operation ...................................................................... 143
Multifeed prevention ........................................................................ 143
Distance-between-pages adjustment .............................................. 144
Media-skew prevention .................................................................................... 145
Feed-speed control .......................................................................................... 147
Fusing and reversing/delivery block ................................................................................. 148
Fusing ............................................................................................................... 148
Face-down delivery .......................................................................................... 148
Face-up delivery ............................................................................................... 149
Jam detection .................................................................................................................... 151
Pickup delay jam from tray 1 ............................................................................ 151
Pickup delay jam from tray 2 ............................................................................ 151
Pickup stationary jam ....................................................................................... 151
Fuser-delivery delay jam .................................................................................. 152
Fuser wrapping jam .......................................................................................... 152
Fuser-delivery stationary jam when feeding regular-size media ..................... 152
Fuser-delivery stationary jam when feeding custom-size media ..................... 152
Reversing delay jam (face-down delivery only) ............................................... 152
Reversing stationary jam (face-down delivery only) ........................................ 152
Delivery delay jam during face-down delivery ................................................. 153
Delivery delay jam during face-up delivery ...................................................... 153
Delivery stationary jam during face-down delivery .......................................... 153
Delivery stationary jam during face-up delivery ............................................... 153
Door-open jam ................................................................................................. 153
Residual-media jam ......................................................................................... 153
Printing from the 500-sheet feeder ................................................................................... 154
500-sheet feeder pickup and feeding .............................................................. 155
Duplex-printing unit ........................................................................................................... 157
Reversing/duplexing pickup ............................................................................. 157
Duplex-printing jam detection .......................................................................... 158
ENWW vii

HP LaserJet M4345 - Multifunction Printer Specifications

General

Print Technology	Laser
Print Speed	Up to 45 ppm
Print Resolution	Up to 1200 x 1200 dpi
Scan Type	Flatbed, ADF
Maximum Copy Resolution	600 x 600 dpi
Fax Capability	Yes
Standard Input Capacity	600 sheets
Standard Output Capacity	250 sheets
Maximum Output Capacity	500 sheets
Connectivity	USB, Ethernet
Functions	Print, copy, scan, fax
Internal Memory	256 MB
Maximum Internal Memory	512 MB
Duplex Printing	Yes
Processor Speed	533 MHz
Operating System Compatibility	Windows, Mac
Monthly Duty Cycle	200, 000 pages