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CHAPTER 2
THEORY OF OPERATION
This chapter describes the operating principles of the circuitry and printer mechanism.
1. Block Diagram ..................................................................................................... 19
2. Main and Interface PCBs .................................................................................... 21
2-1. Interface ................................................................................................................. 21
2-1-1. RS232C .............................................................................................................. 21
2-1-2. RS422A .............................................................................................................. 22
2-1-3. Parallel interface ............................................................................................... 23
2-2. Editing and Printing .............................................................................................. 24
2-2-1. Editing ............................................................................................................... 24
2-2-2. Thermal head .................................................................................................... 24
2-2-3. Head current control ........................................................................................ 25
2-3. Feed-Motor Drive Circuit ...................................................................................... 26
2-4. Power-On Reset Circuit ........................................................................................ 27
2-5. +5V Line Voltage Detector Circuit ....................................................................... 28
3. Printer Mechanism .............................................................................................. 29
3-1. Thermal Head ........................................................................................................ 29
3-2. Paper-Feed Mechanism ........................................................................................ 29
3-3. Detectors ............................................................................................................... 30
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