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CHAPTER 2
OPERATING PRINCIPLES
2.1
2.2
2.3
PRINTER MECHANISM OPERATION.. ................................................................ 2-l
2.1 .l Printhead Mechanism ........................................................................................................... 24
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
POWER SUPPLY OPERATION.. ........................................................................ 2-13
22.1 Power Supply Overview.. .................................................................................................... 2-14
CONTROL CIRCUIT.. ......................................................................................... 2-13
2.3.1 Control Circuit Operation Overview .................................................................................. 2-17
23.2 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