Chapter 2
Operating Principles
2.1 Overview_____________________________________________________________________ 2-1
2.2 Printer Mechanism Operating Principles___________________________________________ 2-1
Printer Mechanism _________________________________________________________________________2-1
Printing Mechanism ________________________________________________________________________2-2
Printhead Structure _______________________________________________________________________2-2
Printing Process__________________________________________________________________________2-3
Printing Methods_________________________________________________________________________2-3
Carriage (CR) Mechanism ___________________________________________________________________2-4
Paper Feed Mechanism ______________________________________________________________________2-5
ASF (Auto Sheet Feeder)___________________________________________________________________2-6
Tractor _________________________________________________________________________________2-7
Manual Feed Mechanism __________________________________________________________________2-7
Adjusting the Loading Position______________________________________________________________2-7
Adjusting the Tear-off Position ______________________________________________________________2-8
Platen Gap (PG) Adjust Mechanism ____________________________________________________________2-8
Ink System ________________________________________________________________________________2-9
Pump _________________________________________________________________________________2-10
Capping Mechanism _______________________________________________________________________2-11
Wiping/CR Lock Mechanism ______________________________________________________________2-12
2.3 Electrical Circuit Operation Principles ___________________________________________ 2-13
C172 PSB/PSE Electrical Circuit Board________________________________________________________2-13
C203 Main Control Board___________________________________________________________________2-15
Reset Circuits___________________________________________________________________________2-17
Sensor Circuits__________________________________________________________________________2-17
CR Motor Driver Circuits _________________________________________________________________2-21
PF Motor Driver Circuit __________________________________________________________________2-22
Printhead Driver Circuit __________________________________________________________________2-23
2.4 Ink System Management _______________________________________________________ 2-27
Ink System Operations______________________________________________________________________2-27
Counters_________________________________________________________________________________2-28
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