HP Color LaserJet Enterprise M553n - Page 10

Low-voltage power supply functions ............................................................................. 19
High-voltage power supply ............................................................................................................... 19
High-voltage power supply circuits ................................................................................ 20
Fuser bias ........................................................................................................................ 21
Fuser control ..................................................................................................................................... 21
Fuser circuits ................................................................................................................... 21
Fuser control functions ................................................................................................... 23
Fuser temperature control ............................................................................................. 23
Fuser heater protection .................................................................................................. 25
Fuser unit life detection .................................................................................................. 25
Fuser identication ......................................................................................................... 25
Engine laser/scanner system .............................................................................................................................. 26
Laser/scanner failure detection ........................................................................................................ 27
Safety ................................................................................................................................................ 27
Image-formation process ................................................................................................................. 28
Step 1: Pre-exposure ...................................................................................................... 33
Step 2: Primary charging ................................................................................................ 33
Step 3: Laser-beam exposure ......................................................................................... 34
Step 4: Development ...................................................................................................... 34
Step 5: Primary transfer ................................................................................................. 35
Step 6: Secondary transfer ............................................................................................. 35
Step 7: Separation ........................................................................................................... 36
Step 8: Fusing .................................................................................................................. 36
Step 9: ITB cleaning ......................................................................................................... 37
Step 10: Drum cleaning ................................................................................................... 37
Toner cartridges ................................................................................................................................ 38
Design ............................................................................................................................. 38
Memory chip .................................................................................................................... 40
Toner seal ........................................................................................................................ 40
Toner level and cartridge life detection .......................................................................... 40
Developing unit engagement and disengagement control ........................................... 40
Cartridge Authentication Technology (CAT) ................................................................... 41
Authentication .............................................................................................. 41
Anti-theft ...................................................................................................... 41
Intermediate transfer belt (ITB) unit ................................................................................................. 42
Primary transfer roller engagement and disengagement control ................................ 42
ITB unit detection ............................................................................................................ 44
ITB cleaning mechanism ................................................................................................. 45
Secondary transfer roller functions ............................................................................... 45
Calibration ....................................................................................................................... 46
Pickup, feed, and delivery system ....................................................................................................................... 47
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