Chapter 2

Operating Principles

2.1 Overview................................................................................................................

2-1

2.2 Printer Mechanism Operating Principle .............................................................

2-1

2.2.1 Printer Mechanism .................................................................................................................

2-1

2.2.2 Printing Mechanism ...............................................................................................................

2-2

2.2.2.1 Printhead Structure ...................................................................................................

2-2

2.2.2.2 Printing Process ........................................................................................................

2-3

2.2.2.3 Printing Methods........................................................................................................

2-3

2.2.3 Carriage (CR) Mechanism......................................................................................................

2-4

2.2.4 Paper Feed Mechanism..........................................................................................................

2-5

2.2.4.1 ASF (Auto Sheet Feeder) Mechanism ......................................................................

2-6

2.2.4.2 Tractor Mechanism....................................................................................................

2-7

2.2.4.3 Manual Feed Mechanism ..........................................................................................

2-7

2.2.5 Platen Gap (PG) Adjust Mechanism .....................................................................................

2-8

2.2.6 Ink System...............................................................................................................................

2-9

2.2.6.1 Pump Mechanism....................................................................................................

2-10

2.2.7 Capping Mechanism.............................................................................................................

2-11

2.2.7.1 Wiping/CR Lock Mechanism ...................................................................................

2-12

2.3 Electrical Circuit Operation Principles .............................................................

2-13

2.3.1 C172 PSB/PSE Electrical Circuit Board..............................................................................

2-13

2.3.2 C203 MAIN Control Board....................................................................................................

2-15

2.3.2.1 Reset Circuits ..........................................................................................................

2-17

2.3.2.2 Sensor Circuits ........................................................................................................

2-17

2.3.2.3 CR Motor Driver Circuits .........................................................................................

2-20

2.3.2.4 PF Motor Driver Circuit............................................................................................

2-21

2.3.2.5 Printhead Driver Circuit ...........................................................................................

2-22

2.4 Ink System Management....................................................................................

2-26

2.4.1 Ink System Operations.........................................................................................................

2-26

2.4.2 Counters ................................................................................................................................

2-27