Star Micronics NX-1020 - Chapter 2 1 2

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CHAPTER 2
THEORY OF OPERATION
1. Block Diagram .....................................................................................................19
2. Main Logic Board ................................................................................................20
2-1. Data Input Operation.............................................................................................20
2-1-1. Parallel Interface ...............................................................................................20
2-1-2. Serial Interface ..................................................................................................21
2-2. General Flow Chart ...............................................................................................24
2-2-1. Editing ................................................................................................................25
2-2-2. Print Head Driving Circuit.................................................................................25
2-2-3. Print Head Temperature Detection Circuit ..................................................... 25
2-2-4. Carriage Motor Driving Circuit ........................................................................ 26
2-2-5. Carriage Motor Speed Control ........................................................................ 27
2-2-6. Paper Feed Motor Driving Circuit ................................................................... 27
2-3. Reset Circuit ..........................................................................................................29
2-4. Reset by +5V Line Voltage Detection ................................................................. 30
2-5. Protection Circuit ..................................................................................................30
3. Power Supply Unit ..............................................................................................31
4. Mechanisms.........................................................................................................33
4-1. Print Head Mechanism..........................................................................................33
4-2. Print Head Carrying Mechanism ......................................................................... 33
4-3. Ink Ribbon Feed Mechanism................................................................................34
4-4. Paper Feed Mechanism ........................................................................................35
4-5. Detectors ...............................................................................................................36