CHAPTER 2
MECHANISM CONFIGURATION AND OPERATING PRINCIPLES
2
CONTENTS
2.1 PRINTER MECHANISM COMPONENTS .................................. 2-1
2.2 PRINTER MECHANISM OPERATING PRINCIPLES ................ 2-1
2.2.1 Transport Mechanism ................................................... 2-1
Carriage feed gear train ................................................ 2-1
Paper feed gear train ..................................................... 2-1
2.2.2 Printing Mechanism....................................................... 2-2
Print head unit movement............................................. 2-3
Wire movement for printing a single dot ..................... 2-3
Printing operations involved in forming one character 2-3
Platen movement ........................................................... 2-4
2.2.3 Detection Mechanism .................................................... 2-4
Home position detection mechanism .......................... 2-4
Carriage motor out-of-phase state detection
mechanism ..................................................................... 2-5
Cut sheet detection mechanism................................... 2-5
Paper roll near-end detection mechanism .................. 2-6
Cover open detection mechanism ............................... 2-6
2.2.4 Paper Feed Mechanism ................................................. 2-6
Paper feed operations ................................................... 2-6
Paper feed component mechanisms ........................... 2-8
Other mechanisms ........................................................ 2-10
2.2.5 Ribbon Feed Mechanism .............................................. 2-12
Ribbon feed operation................................................... 2-12
2.2.6 Paper Roll Take-Up Mechanism ................................... 2-12
Paper roll supply mechanism ....................................... 2-12
Paper roll take-up mechanism...................................... 2-13
2.3 ELECTRICAL CIRCUITRY OPERATING PRINCIPLES........... 2-14
2.3.1 Hardware Configuration ................................................ 2-14
Component connection diagram.................................. 2-14
Circuit block diagram .................................................... 2-15
Memory map................................................................... 2-16
2.3.2 Principles of Operation ................................................. 2-16
Power supply circuitry .................................................. 2-16
Control circuitry ............................................................. 2-18
Printer mechanism drive control circuit ...................... 2-25
CONFIDENTIAL
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