Epson Stylus Photo Service Manual page 37

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 Paper Gap Adjust 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 ............................................................................................... 2-18
2.2.2 C209 Main Board .................................................................................................................. 2-20
2.2.2.1 Reset Circuits .......................................................................................................... 2-21
2.2.2.2 Sensor Circuits ........................................................................................................ 2-22
2.2.2.3 EEPROM Control Circuits ....................................................................................... 2-23
2.2.2.4 Timer Circuit ............................................................................................................ 2-24
2.2.2.5 Print Head Drive Circuit ........................................................................................... 2-25
2.2.2.6 Motor Drive Circuits ................................................................................................. 2-27
2.3 Ink System Control .............................................................................................2-28
2.3.1 Ink System Basic Functions................................................................................................ 2-28
2.3.2 Timers and Counters............................................................................................................ 2-29
2.3.3 Ink System Sequence........................................................................................................... 2-30
Chapter 2
Operating Principles