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CHAPTER 2
OPERATING PRINCIPLES
2.1 PRINTER MECHANISM OPERATION..................................................................2-1
2.1.1 Printhead Mechanism ........................................................................................................... 2-4
2.1.2 Carriage Mechanism ............................................................................................................. 2-5
2.1.3 Platen Gap Adjustment Mechanism .................................................................................... 2-6
2.1.4 Paper Feed Mechanism......................................................................................................... 2-7
2.1.4.1 Tractor Wire Operation............................................................................................. 2-9
2.1.5 Ribbon Feed and Tractor Select Mechanisms.................................................................. 2-10
2.1.6 Plunger Mechanism............................................................................................................. 2-12
2.2 POWER SUPPLY OPERATION..........................................................................2-13
2.2.1 Power Supply Overview...................................................................................................... 2-14
2.3 CONTROL CIRCUIT ...........................................................................................2-13
2.3.1 Control Circuit Operation Overview .................................................................................. 2-17
2.3.2 Reset Circuit......................................................................................................................... 2-21
2.3.3 Sensor Circuits .................................................................................................................... 2-22
2.3.4 CR Motor Drive Circuit........................................................................................................ 2-25
2.3.5 PF Motor Drive Circuit......................................................................................................... 2-29
2.3.6 RF Motor Drive Circuit ........................................................................................................ 2-30
2.3.7 PG Motor Drive Circuit........................................................................................................ 2-31
2.3.8 Plunger Drive Circuit........................................................................................................... 2-32
2.3.9 Printhead Drive Circuit........................................................................................................ 2-33