Principles Of Operation - Epson LQ-510 Technical Manual

REV.-A

PRINCIPLES OF OPERATION

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