Star Micronics NX-1000 series - Chapter 2: Theory of Operation

CHAPTER 2
THEORY OF OPERATION
1. Block Diagram ..................................................................................................... 15
2. Main Logic Board ................................................................................................ 16
2-1. Data Input Operation............................................................................................. 16
2-1-1. Parallel Interface ............................................................................................... 16
2-1-2. Commodore Interface....................................................................................... 17
2-2. General Flow Chart ............................................................................................... 19
2-2-1. Editing ............................................................................................................... 20
2-2-2. Print Head Driving Circuit ................................................................................ 20
2-2-3. Carriage Motor Driving Circuit......................................................................... 20
2-2-4. Carriage Motor Speed Control ......................................................................... 21
2-2-5. Paper Feed Motor Driving Circuit .................................................................... 22
2-3. Reset Circuit .......................................................................................................... 23
2-4. Reset by +5V Line Voltage Detection .................................................................. 24
2-5. Protection Circuit .................................................................................................. 24
3. Power Supply Unit .............................................................................................. 24
4. Mechanisms......................................................................................................... 25
4-1. Print Head Mechanism.......................................................................................... 25
4-2. Print Head Carrying Mechanism .......................................................................... 25
4-3. Ink Ribbon Feed Mechanism................................................................................ 26
4-4. Paper Feed Mechanism ........................................................................................ 27
4-5. Detectors ............................................................................................................... 28
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