Konica Minolta Bizhub 20p Service Manual page 32

CHAPTER 2 THEORY OF OPERATION
This chapter gives an overview of the 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
1. OVERALL......................................................................................................................2-1
1.1 General Block Diagram ......................................................................................... 2-1
2. ELECTRONICS ............................................................................................................. 2-2
2.1 General Block Diagram ......................................................................................... 2-2
3. MECHANICS ................................................................................................................. 2-3
3.1 Cross-section Drawing .......................................................................................... 2-3
3.2 Cross-section Drawing .......................................................................................... 2-4
3.2.1 Plate-up Function of the Paper Tray .......................................................... 2-5
3.2.2 Paper supply .............................................................................................. 2-6
3.2.3 Paper registration ....................................................................................... 2-7
3.2.4 Paper eject ................................................................................................. 2-8
3.2.5 Duplex printing ........................................................................................... 2-9
3.2.6 Paper feeding from the MP tray ............................................................... 2-10
3.2.7 Paper feeding from the tray 2 / tray 3....................................................... 2-10
3.3 Toner Cartridge.................................................................................................... 2-11
3.3.1 Methods for Detecting and Counting Toner Life ....................................... 2-11
3.3.2 Cartridge life ............................................................................................. 2-12
3.3.3 New toner detection ................................................................................. 2-13
3.4 Print ..................................................................................................................... 2-16
3.4.1 Basic Principle.......................................................................................... 2-16
3.4.2 Print Process ............................................................................................ 2-17
3.5 Sensors position .................................................................................................. 2-22
CONTENTS
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