CHAPTER 3 THEORY OF OPERATION; CHAPTER 3 THEORY OF OPERATION ; CONTENTS - Page 45

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CHAPTER 3  THEORY OF OPERATION 

This chapter gives an overview of the scanning and printing mechanisms as well as the sensors,  
actuators, and control electronics.  It aids in understanding the basic principles of operation as  
well as locating defects for troubleshooting. 

CONTENTS 

3.1 OVERVIEW ...................................................................................................................... 3-1 

3.2 MECHANICAL 

COMPONENTS....................................................................................... 3-2 

3.2.1 Scanner 

Mechanism ............................................................................................ 3-3 

3.2.2 Printing 

Mechanism.............................................................................................. 3-6 

3.2.2.1 Paper 

supply ................................................................................................ 3-6 

3.2.2.2 

Push-up function of paper tray..................................................................... 3-8 

3.2.2.3 Paper 

registration....................................................................................... 3-10 

3.2.2.4 Paper 

eject ................................................................................................. 3-11 

3.2.2.5 Drum 

unit.................................................................................................... 3-11 

3.2.2.6 Toner 

cartridge........................................................................................... 3-12 

3.2.2.7 Print 

process .............................................................................................. 3-15 

3.2.3  Sensors and Actuators ....................................................................................... 3-18 

3.3 CONTROL 

ELECTRONICS........................................................................................... 3-19 

3.3.1 Components ....................................................................................................... 3-19