Epson Stylus COLOR 1520 Service Manual page 42

2.1. Overview .............................................................................................................. 2-1
2.2. Printer Mechanism Operating Principle ............................................................ 2-1
2.2.1.1. M-4I60 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 ................................................................................................ 2-5
2.2.4. Paper Feed Mechanism.................................................................................................... 2-6
2.2.4.1. ASF (Auto Sheet Feeder) Mechanism ................................................................. 2-7
2.2.4.2. Tractor Mechanism .............................................................................................. 2-8
2.2.4.3. Manual Feed Mechanism..................................................................................... 2-8
2.2.5. Platen Gap (PG) Adjust Mechanism................................................................................ 2-9
2.2.6. Ink System .......................................................................................................................2-10
2.2.6.1. Pump Mechanism...............................................................................................2-11
2.2.7. Capping Mechanism .......................................................................................................2-14
2.2.7.1. Wiping/CR Lock Mechanism...............................................................................2-15
2.3. Electrical Circuit Operation Principles............................................................ 2-16
2.3.1. C172 PSB/PSE Electrical Circuit Board .........................................................................2-16
2.3.2. C211 MAIN Control Board ...............................................................................................2-18
2.3.2.1. Reset Circuits .....................................................................................................2-20
2.3.2.2. Sensor Circuits ...................................................................................................2-20
2.3.2.3. CR Motor Driver Circuits.....................................................................................2-22
2.3.2.4. PF Motor Driver Circuit.......................................................................................2-23
2.3.2.5. Printhead Driver Circuit ......................................................................................2-24
2.4. Ink System Management .................................................................................. 2-27
2.4.1. Ink System Operations....................................................................................................2-27
2.4.2. Counters ..........................................................................................................................2-28
Chapter 2
Operating Principles