Epson LQ-510 - Chapter 2 Principles of Operation; Principles of Operation

REV.-A
PRINCIPLES OF OPERATION
CHAPTER 2
PRINCIPLES OF OPERATION
2.1 OVERVIEW
....................................................................................
2-1
2.1.1 Connectors Summary
..........................................................
2-1
2.1.2 Outline of Printer Mechanism Operation
............................... 2-3
2.1.2.1 Sensors
...............................................................
2-4
2.1.2.2
Motors
.................................................................
2-9
2.1.2.3 Printhead
.............................................................
2-9
2.1.3 Circuit Overview
................................................................. 2-10
2.1.3.1 Overview of Power Supply Circuit
.......................... 2-10
2.1.3.2 Control Circuit Block Diagram
................................
2-11
2.2 OPERATION OF THE POWER SUPPLY CIRCUIT
...............................
2-13
2.2.1 Power Supply Circuit Block Diagram
....................................
2-13
2.2.2 Filter Circuit........................................................................
2-14
2.2.3 Rectifier and Smoothing Circuit
............................................
2-15
2.2.4 Starting Circuit (Main Switching Circuit)
................................ 2-15
2.2.5 + 24 VDC Voltage Control Circuit
.........................................
2-19
2.2.6 + 5 VDC Regulator Circuit
....................................................
2-21
2.2.7 Voltage Limiting Circuit .......................................................
2-25
2.2.8 ± 12 VDC Supply Circuit ......................................................
2-26
2.3 PRINTER MECHANISM AND CONTROL CIRCUIT OPERATION ............ 2-27
2.3.1 Vx Voltage Supply Circuit
....................................................
2-27
2.3.2 Reset Circuit
.......................................................................
2-28
2.3.3 Address Decoder and Bank Register
.................................... 2-33
2.3.4 Carriage Operation
.............................................................. 2-35
2.3.4.1 Carriage Mechanism
.............................................. 2-35
2.3.4.2 Carriage Motor Specifications
................................ 2-36
2.3.4.3 Carriage Motor Drive Circuit Block Description..
.....
2-36
2.3.4.4 Gate Array E01A05 Operation in Carriage Motor
Drive Circuit .........................................................
2-37
2.3.4.5 Carriage Motor Drive Circuit
.................................. 2-38
2.3.4.6 Carriage Motor Software Control
............................ 2-47
2.3.5 Paper Feed .........................................................................
2-51
2.3.5.1 Paper-Feed Mechanism Operation
.......................... 2-51
2.3.5.2 Paper-Feed Motor Specifications
............................ 2-52
2.3.5.3 Paper-Feed Motor Drive Circuit
..............................
2-53
2.3.5.4
Paper-Feed Motor Software Control ....................... 2-54
LQ-510
2-i