Epson Stylus COLOR 800 Service Manual page 40

2.1 Overview................................................................................................................2-1
2.2 Printer Mechanism Operating Principles ...........................................................2-1
2.2.1 General Description ............................................................................................................... 2-1
2.2.2 Printing Mechanism ............................................................................................................... 2-2
2.2.2.1 Printing Process ........................................................................................................ 2-3
2.2.2.2 Printing Methods........................................................................................................ 2-3
2.2.3 Carriage (CR) Mechanism...................................................................................................... 2-4
2.2.4 Paper Feed Mechanism.......................................................................................................... 2-5
2.2.5 Platen Gap (PG) Adjust Mechanism ..................................................................................... 2-6
2.2.6 CR Lock Mechanism .............................................................................................................. 2-6
2.2.7 ASF Mechanism ...................................................................................................................... 2-7
2.2.8 Ink System............................................................................................................................... 2-9
2.2.8.1 Pump Mechanism.................................................................................................... 2-10
2.2.8.2 Capping Mechanism................................................................................................ 2-12
2.3 Electrical Circuit Operation Principles .............................................................2-13
2.3.1 C202 PSB/PSE board............................................................................................................ 2-13
2.3.2 C202 MAIN Control Board.................................................................................................... 2-15
2.3.2.1 Printhead Driver Circuit ........................................................................................... 2-16
2.3.2.2 Reset Circuits .......................................................................................................... 2-18
2.3.2.3 Motor Driver Circuits................................................................................................ 2-19
2.3.2.4 Sensor Circuits ........................................................................................................ 2-20
2.4 Ink System Management....................................................................................2-21
2.4.1 Ink System Operations......................................................................................................... 2-21
2.4.2 Timers and Counters............................................................................................................ 2-22
2.4.3 Ink System Sequence........................................................................................................... 2-23
Chapter 2
Operating Principles