Epson 440 - Chapter 2 Operating Principles

Chapter 2
Operating Principles
2.1 OVERVIEW ............................................................................................................2-1
2.1.1 Printer Mechanism............................................................................................................ 2-1
2.1.1.1 Printing Mechanism.............................................................................................. 2-2
2.1.1.1.1 Printing Process......................................................................................... 2-3
2.1.1.1.2 Printing Method ......................................................................................... 2-4
2.1.1.2 Carriage Mechanism............................................................................................. 2-7
2.1.1.2.1 Platen Gap Adjust Mechanism and Parallel adjustment Mechanism..........2-10
2.1.1.3 Paper Feed Mechanism and Pump Mechanism...................................................2-11
2.1.1.4 Ink System ..........................................................................................................2-14
2.1.1.4.1 Pump, Carriage Lock, Head Cleaner Mechanism......................................2-15
2.1.1.4.2 Cap Mechanism........................................................................................
2-17
2.2 Electrical Circuit Operating Principles.............................................................2-18
2.2.1 C206 PSB/PSE Power Board ...........................................................................................2-19
2.2.2 C200 Main Board ..............................................................................................................2-21
2.2.2.1 Reset Circuits......................................................................................................2-23
2.2.2.2 Sensor Circuits....................................................................................................2-24
2.2.2.3 EEPROM Control Circuits....................................................................................2-25
2.2.2.4 Timer Circuit........................................................................................................2-26
2.2.2.5 DRAM Control .....................................................................................................2-26
2.2.2.6 Print Head Control Circuit....................................................................................2-27
2.2.2.7 PF(Pump) Motor Drive Circuit .............................................................................2-30
2.2.2.8 CR Motor Drive Circuit ........................................................................................2-31