Epson STYLUS 3000 Service Manual page 41

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
Chapter 2
Operating Principles