This chapter describes the operating principles of the circuitry and printer mechanism.
1. Block Diagram ................................................................................................... 16
2. Main Logic Board .............................................................................................. 18
2-1. Data I/O Circuitry .................................................................................................. 18
2-1-2.RS-422A Interface ............................................................................................ 19
2-1-3.
Parallel Interface .......................................................................................... 20
2-2-1.
Editing .......................................................................................................... 21
2-2-2.
Thermal Head ............................................................................................... 21
2-2-3.
Head Current Control .................................................................................. 22
3. Printer Mechanism ............................................................................................ 26
3-1. Thermal Head ........................................................................................................ 26
3-3. Sensor ................................................................................................................... 27
CHAPTER 2
THEORY OF OPERATION
2