Epson LQ-510 Technical Manual page 40

PRINCIPLES OF OPERATION
2.3.6 Printhead ............................................................................
2.3.7 A/D Converter Circuit ..........................................................
2.3.8 Host Interface .....................................................................
2.3.9 EEPROM Circuit ..................................................................
2.3.10 Ribbon-Feed Mechanism ......................................................
Figure 2-1.
Figure 2-2.
Figure 2-3.
Figure 2-4.
Figure 2-5.
Figure 2-6.
Figure 2-7.
Figure 2-8.
Figure 2-9.
Figure 2-10.
Figure 2-11.
Figure 2-12.
Figure 2-13.
Figure 2-14.
Figure 2-15.
Figure 2-16.
Figure 2-17.
Figure 2-18.
Figure 2-19.
Figure 2-20.
Figure 2-21.
Figure 2-22.
2-ii
Printhead Printing Operation ................................. 2-55
2.3.6.1
2.3.6.2 Printhead Specifications ........................................
Printhead Drive Circuit Block Diagram.. .................. 2-56
2.3.6.3
Gate Array E05A02 Operation in Printhead
2.3.6.4
Drive Circuit .........................................................
2.3.6.5 Printhead Drive Circuit ..........................................
2.3.6.6 Printhead Software Control ................................... 2-59
LIST OF FIGURES
Cable Connections...........................................................
Printer Mechanism Block Diagram .................................... 2-3
Paper-End Sensor Mechanism ..........................................
Paper-End Sensor Circuit .................................................
Home-Position Sensor Mechanism .................................... 2-5
Home-Position Sensor Circuit ...........................................
Thermal Sensor Mechanism (Printhead Temperature
Detection) .......................................................................
Thermal Sensor Circuit ....................................................
Platen Gap Sensor Mechanism .........................................
Platen Gap Sensor Circuit ................................................
Friction/Tractor Sensor Mechanism .................................. 2-8
Friction/Tractor Sensor Circuit .........................................
Printhead ........................................................................
Overview of Power Supply Circuit Operation ..................... 2-10
Control Circuit Block Diagram ..........................................
Power Supply Circuit Block Diagram ................................. 2-13
Filter Circuit (SANPS Board, 120 V Version). ..................... 2-14
Filter Circuit (SANPSE Board, 220/240 V Version) ............. 2-14
Rectifier and Smoothing Circuit ........................................
Starting Circuit (Main Switching Circuit) ............................ 2-17
Main Switching Circuit Waveforms .................................... 2-18
+24 VDC Voltage Control Circuit...................................... 2-19
REV.-A
2-55
2-55
2-57
2-56
2-60
2-63
2-64
2-65
2-2
2-4
2-4
2-5
2-6
2-6
2-7
2-7
2-8
2-9
2-11
2-15
LQ-510